Section 07 55 63 EXTENSIVE VEGETATED ROOF ASSEMBLY

Tremco, Inc.

Specifier: This guide specification section specifies Tremco VR UltraLite lightweight built-up vegetated roof assembly with a Tremco TREMproof® 250GC cold-applied elastomeric waterproofing membrane.

This pre-edited MasterFormat specification section is created for limited distribution by Tremco, Inc. for use on a single project. Tremco modifications are Copyright 2005 – 2017 by Tremco, Inc. Review and accept changes according to project requirements and specifier's practice.

Revise this Section by deleting and inserting text to meet Project-specific requirements.

Use this section in combination with a properly formatted Division 07 Thermal and Moisture Protection section and, where required, a membrane leak detection system and irrigation system.

We highly recommend you edit this section in consultation with a Tremco Vegetated Roof Specialist. Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

This Section uses the term "Architect." Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions.

For more information about Tremco waterproofing products, contact Tremco Commercial Sealants and Waterproofing Division, Beachwood, OH 44122, (800) 3217906, email: [email protected]; http://www.tremcosealants.com.

SECTION 07 55 63 –VEGETATED ROOF ASSEMBLY: LIGHTWEIGHT EXTENSIVE BUILT-UP

1. GENERAL

1.1.1. SUMMARY

1.1.1.A.Section Includes:

1.1.1.A.1. Hot Fluid-Applied Waterproofing system. 1.1.1.A.2. Extensive vegetated roof assembly components. 1.1.1.A.3. Vegetation-free zone material.

If retaining this Related Sections paragraph, edit list below to suit Project requirements. Include items that Contractor may normally anticipate would be specified in this Section. Sections cross-referenced within the Section text are not included here.

1.1.2. RELATED SECTIONS

1.1.2.A.1. Section 01 81 13 "Sustainable Design Requirements" for additional LEED requirements. 1.1.2.A.2. Section 03 31 00 “Structural Concrete” for coordination with waterproofing membrane. 1.1.2.A.3. Section 03 30 00 “Cast-in-Place Concrete” for moisture curing of concrete waterproofing substrate. 1.1.2.A.4. Division 07 "Thermal and Moisture Protection." 1.1.2.A.5. Section 07 27 00 “Air Barriers.” 1.1.2.A.6. Section 07 72 00 “Roof Accessories: Manufactured Vents, Hatches, and Walkways.” 1.1.2.A.7. Section 07 72 73 "Membrane Leak Detection System." 1.1.2.A.8. Section 11 24 29 "Facility Fall Protection" for fall protection devices at roof openings and perimeter. 1.1.2.A.9. Section 22 00 00 “Plumbing.” 1.1.2.A.10. Section 32 84 00 "Planting Irrigation for Vegetated Roofs."

1.1.3. REFERENCES

1.1.1.A.1. American Society for Testing and Materials (ASTM):

1.1.1.A.1.a. ASTM C 836 – Standard Specification for High-Solids Content, Cold Liquid- Applied Elastomeric Waterproofing Membrane for Use with Separate Wearing Course 1.1.1.A.1.b. ASTM C 920 - Standard Specification for Elastomeric Joint Sealants 1.1.1.A.1.c. ASTM D 4258 - Standard Practice for Surface Cleaning Concrete for Coating 1.1.1.A.1.d. ASTM D 4263 - Standard Test Method for Indicating Moisture in Concrete by the Plastic Sheet Method 1.1.1.A.1.e. ASTM D 4491 – Standard Test Methods for Water Permeability of Geotextiles by Permittivity 1.1.1.A.1.f. ASTM D 4533 – Standard Test Method for Trapezoid Tear Strength of Geotextiles 1.1.1.A.1.g. ASTM D 4716 - Standard Test Method for Determining the (In-plane) Flow Rate per Unit Width and Hydraulic Transmissivity of a Geosynthetic Using a Constant Head 1.1.1.A.1.h. ASTM D 6693 – Standard Test Method for Determining Tensile Properties of Nonreinforced Polyethylene and Nonreinforced flexible Polypropylene Geomembranes

1.1.1.A.1.i. ASTM D 7003 - Standard Test Method for Strip Tensile Properties of Reinforced Geomembraes 1.1.1.A.1.j. ASTM D 7004 – Standard Test Method for Grab Tensile Properties of Reinforced Geomembranes 1.1.1.A.1.k. ASTM E 2397 - Standard Practice for Determination of Dead Loads and Live Loads Associated with Vegetative (Green) Roof Systems 1.1.1.A.1.l. ASTM E 2399 - Standard Test Method for Maximum Media Density for Dead Load Analysis of Vegetative (Green) Roof Systems 1.1.1.A.1.m. ASTM E 2400 - Standard Guide for Selection, Installation, and Maintenance of Plants for Green Roof Systems 1.1.1.A.1.n. ASTM E 84 - Standard Test Method for Surface Burning Characteristics of Building Materials 1.1.1.A.1.o. ASTM E 96/E 96M - Standard Test Methods for Water Vapor Transmission of Materials

1.1.1.A.2. Underwriters Laboratories (UL) Class A.

1.1.4. DEFINITIONS

1.1.1.A.Vegetated Roof; Green Roof; Roof Garden: An area of planting/landscaping, built up on a waterproofed substrate at any level that is separated from the natural ground by a man-made structure.

1.1.1.A.1. Extensive Vegetated Roof: Shallow landscape built using an assembly of less than 6 inches (152 mm) thick, with hardy, drought-tolerant plant species.

1.1.1.B. Vegetated Roof Assembly; Green Roof Assembly; Roof Garden Assembly: Multi-layered landscaped assembly composed of inorganic and organic layers, designed to grow plants and to retain and retard rainwater runoff from the roof.

1.1.1.B.1. Extensive Vegetated Roof Assemblies consist of the following fully integrated living and manufactured components:

1.1.1.A.1.a. Waterproofing membrane. 1.1.1.A.1.b. Electronic leak detection. 1.1.1.A.1.c. Root barrier. 1.1.1.A.1.d. Drainage layer. 1.1.1.A.1.e. Technical seam tapes. 1.1.1.A.1.f. [Horizontal insulation]. 1.1.1.A.1.g. Water retention layer. 1.1.1.A.1.h. Pre-cultivated vegetation mat: [Standard sedum blends] [Custom sedum blends]. 1.1.1.A.1.i. [Drain inspection box]. 1.1.1.A.1.j. [Edging restraint]. 1.1.1.A.1.k. [Pre-cast concrete pavers] [Loose aggregate]. 1.1.1.A.1.l. Irrigation.

1.1.1.C. Root Barrier: A water impermeable, flexible layer below the green roof system that serves as a protection against root encroachment into the underlying roof components.

1.1.1.D.Drainage; Filter: A composite material that creates sufficient space below the vegetated and water retention layers to facilitate movement of excess water to roof drains while restricting particulates from clogging the drainage path.

1.1.1.E. Pre-Cultivated Vegetation Mat: A flexible combination of plants and planting substrate. Pre-cultivated mats are harvested from the field fully vegetated and delivered to the installation site as sheets or rolls.

1.1.1.F. Plant; Plants; Plant Material: Vegetation in general, including trees, shrubs, vines, ground covers, ornamental grasses, bulbs, corms, tubers, or herbaceous vegetation.

1.1.1.G.Captured Water: Water that is retained in the drainage layer of a vegetated roof assembly after new water additions have ceased and that cannot escape the roof except through evaporation or plant transpiration.

1.1.1.H.Retained Water: Water that is held for a period of hours or days but would eventually drain out given enough time in the absence of evaporation or plant transpiration.

1.1.1.I. Planted Area; Vegetated Area: Areas to be planted.

1.1.1.J. Vegetation-Free Zone: Areas without plantings.

1.1.1.K.Alive: Displaying horticultural viability consisting of vigorous, hardy, and sustainable growth characteristics.

1.1.5. ACTION SUBMITTALS

1.1.1.B. Submittals in accordance with Section [01 33 00 “Submittal Procedures”].

1.1.1.C. Coordinate submittal requirements and provide submittals required by Section [01 81 13 “Sustainable Requirements: Construction”].

1.1.1.D.Product Data: For each of the components of vegetated roof assembly indicated, including the following:

1.1.1.D.1. Waterproofing membrane. 1.1.1.D.2. Root barrier. 1.1.1.D.3. Drainage layer. 1.1.1.D.4. Water retention layer. 1.1.1.D.5. Pre-cultivated vegetation mat: [Standard sedum blends] [Custom sedum blends]. 1.1.1.D.6. [Drain inspection box]. 1.1.1.D.7. [Edging restraint]. 1.1.1.D.8. [Pre-cast concrete pavers] [Loose aggregate]. 1.1.1.D.9. Technical seam tapes. 1.1.1.D.10. Irrigation.

1.1.1.E. US Occupational Health and Safety Administration’s (OHSA) Hazard Communications Standard (HCS): Safety Data Sheets (SDS): For each of the following components of vegetated roof assembly:

1.1.1.E.1.Waterproofing membrane. 1.1.1.E.2.Root barrier. 1.1.1.E.3.Drainage layer. 1.1.1.E.4.Water retention layer. 1.1.1.E.5.[Drain inspection box]. 1.1.1.E.6.[Edging restraint]. 1.1.1.E.7.Technical seam tapes.

Specifier: Retain and edit "LEED Submittals" Paragraph for projects pursuing LEED certification; modify provisions if sustainable design submittals are required for non-LEED projects or for Federal projects.

1.1.1.F. LEED Submittals:

1.1.1.F.1. Product Test Reports for Credit SS 7.2: For paver and aggregate surfacing materials, indicating that materials comply with Solar Reflectance Index requirement. 1.1.1.F.2. Product Data for Credit MR 4: For products having recycled content, documentation indicating percentages by weight of postconsumer and pre-consumer recycled content. Include statement indicating cost for each product having recycled content.

1.1.1.G.Shop Drawings: For vegetated roof assemblies. Include roof plans, slopes, and drain locations; details of vegetated roof assemblies and accessories [, walkway pavers][, and aggregate surfacing].

1.1.1.G.1. Indicate planted areas correlated with planting schedule. 1.1.1.G.2. Coordinate with requirements for membrane leak detection system.

1.1.1.H.Samples for Verification: Two (2) samples for each of the following components of vegetated roof assembly:

1.1.1.H.1. Root barrier: 12 inch x 12 inch. 1.1.1.H.2. Drainage layer: 12 inch x 12 inch 1.1.1.H.3. Water retention layer: 12 inch x 12 inch. 1.1.1.H.4. Pre-cultivated vegetation mat: 12 inch x 12 inch.

1.1.6. INFORMATIONAL SUBMITTALS

1.1.1.I. Installer’s Certificate: For vegetated roof assembly Installer and irrigation system Installer, verifying qualifications on company letterhead.

1.1.1.J. Manufacturer’s Certificate: For specified products of vegetated roof assembly, signed by Manufacturer, verifying approval of Installer.

1.1.1.K.Certifications for Waterproofing:

1.1.1.K.1. Certification from an approved independent testing laboratory experienced in testing waterproofing membrane for all applicable ASTM methods. 1.1.1.K.2. Certification showing full time quality control of production facilities responsible for the manufacture of the waterproofing membrane and that each batch of material is tested to ensure conformance with the manufacturer’s published physical properties. 1.1.1.K.3. The plant manufacturing the waterproofing membrane shall have ISO 9001-2000 approval as evidenced by a copy of the official certificate. 1.1.1.K.4. Evidence that the waterproofing membrane assembly is currently Class A listed with Underwriters Laboratories.

1.1.1.L. Manufacturer Field Inspection Reports: Manufacturer’s written reports and acceptance of vegetated roof assembly Installer based on regular inspections. Include weather conditions, description of work performed, tests performed, defective work observed, and corrective actions taken to correct defective work.

1.1.1.M. Warranty: Sample of special warranty.

1.1.7. CLOSEOUT SUBMITTALS

1.1.1.N.Maintenance Data: Recommended maintenance plan including procedures for inspection and care of vegetated roof assembly and plants during a calendar year. Submit before start of required warranty and maintenance periods.

1.1.1.O.Maintenance Reports: Reports of vegetated roof assembly Inspector submitted quarterly. Must be signed by approved representation of vegetated roof assembly Installer, must outline actions carried out as per Maintenance Requirements.

1.1.8. QUALITY ASSURANCE

1.1.8.A.Waterproofing Installer Qualifications: A qualified Installer, certified by waterproofing system manufacturer as a locally based, authorized applicator of the product the installer intends to use.

1.1.1.K.1. Experience: [Five] years' proven experience in application of membrane product. 1.1.1.K.2. Experience: List of at least three projects, satisfactorily completed within the last five years, of similar scope and complexity to this project. Previous experience submittal shall correspond to specific membrane system proposed for use by applicator.

1.1.8.B. Vegetated Roof Assembly Installer Qualifications: A qualified Installer, certified by vegetated roof assembly Manufacturer, whose work has resulted in successful establishment of plants.

1.1.8.B.1. Experience: [Five] years' proven experience in vegetated roof assembly installation in addition to requirements in Section 01 40 00 "Quality Requirements." 1.1.8.B.2. Experience: List of at least three projects, satisfactorily completed within the past five years, of similar scope and complexity to this project. 1.1.8.B.3. Training: Staff trained to facilitate maintenance of vegetated roof assembly. 1.1.8.B.4. Fall Protection: Fall Arrest Certificates maintained by all employees of Installer when working on rooftop. 1.1.8.B.5. Installer's Field Supervision: Maintain experienced full-time supervisor on Project site when work is in progress.

1.1.8.C. Waterproofing Manufacturer Qualifications: A qualified company, that shall demonstrate qualifications to supply materials of this section by certifying the following:

1.1.8.C.1. Experience: [Five] years' experience in supplying waterproofing membrane on projects of similar scope and complexity.

1.1.8.D.Vegetated Roof Assembly Manufacturer Qualifications: A qualified company, specialized in supplying vegetated roof assembly systems.

1.1.8.D.1. Experience: [Five] years' experience in supplying vegetated roof assemblies on projects of similar complexity.

1.1.8.E. Source Limitations: Obtain certification showing that all components of vegetated roof assembly and roof membrane are being supplied and warranted by a single-source manufacturer.

1.1.8.F. The product should be resistant to acids (fertilizers, building washes and acid rain) and maintain membrane thickness during application respectively.

1.1.8.G.Waterproofing Manufacturer shall have available an in-house technical staff to assist the contractor, when necessary, in application of the products and final inspection of the assembly.

1.1.8.H.Mock-Up: Build mock-ups to set quality standards for materials and executions.

1.1.8.H.1. Build mock-up of vegetated roof assembly and associated components and accessories. 1.1.8.H.2. Size: 100 sq. ft. (9.25 sq. m.), 10 ft. x 10 ft. (3.048 m x 3.048 m) to demonstrate assembly installation and standard of workmanship. 1.1.8.H.3. Subject to compliance with requirements, approved mock-ups may become part of the completed Work if undisturbed at time of Substantial Completion.

1.1.8.I. Electronic Testing: Perform leak testing by installation of Electro Field Vector Mapping (EFVM) system administered by a qualified testing agency. Flood testing is unacceptable as a testing procedure.

1.1.8.J. Health and safety: Perform in accordance to Health and Safety Requirements.

1.1.8.K.Pre-Installation Conference: Conduct conference at Project site [one] week prior to beginning [work of this Section] [and] [on-site installations] in accordance with Section [01 32 16 “Construction Progress Schedule – Critical Path Method (CPM)”].

1.1.8.K.1. Coordinate: Requirements and procedures related to roof deck and roofing system construction: 1.1.8.K.2. Participants: authorized representatives of Contractor [, Construction Manager], [Owner,] Consultant, Roofing Subcontractor, Roofing Manufacturer, vegetated roof assembly Manufacturer, vegetated roof assembly Installer. 1.1.8.K.3. Vegetated Roof Assembly: Review methods and procedures, including Manufacturer’s written installation instructions. 1.1.8.K.4. Construction Schedule: Review and confirm availability of products, Subcontractor personnel, equipment, and facilities. 1.1.8.K.5. Conformance: Review roofing membrane type and vegetated roof assembly criteria. 1.1.8.K.6. Structural Load: Review limitations of roof deck, identifying loading areas for storage. Obtain structural report from Consultant certifying dead load weight restrictions for entire assembly. 1.1.8.K.7. Roof Details: Review flashing, drains, penetrations, equipment curbs, and other conditions. 1.1.8.K.8. Regulations: Review, including necessary insurance and/or certificates. 1.1.8.K.9. Safety: Review requirements, including Fall Protection requirements. 1.1.8.K.10. Quality Control: Review procedures and policy. 1.1.8.K.11. EFVM: Obtain report certifying roof is watertight. 1.1.8.K.12. Coordinate: related work specified in other Sections. 1.1.8.K.13. Inspection: Review Manufacturer’s procedure for warranty. 1.1.8.K.14. On-site traffic: Review limits by other trades on vegetated roof assembly and procedures for compensation due to damage. 1.1.8.K.15. Meeting minutes: Taken by representative of Consultant and distributed to all parties within 24 hours of meeting date. 1.1.8.K.16. Photographic records: Taken by Contractor prior to commencement of Work.

1.1.9. PROJECT FIELD CONDITIONS

A. Product Handling: Deliver and store products in original packaging with Manufacturer’s labels and materials list intact and signed off, elevated from ground and protected from environmental damage within designated weather protected areas. Avoid storage of products on site to prevent contamination.

B. Apply waterproofing within the range of ambient and substrate temperatures recommended by a waterproofing manufacturer.

1.1.1.O.1. Protect substrates from environmental conditions that affect waterproofing performance. 1.1.1.O.2. Do not apply waterproofing to wet substrate or during snow, rain, fog, or mist. 1.1.1.O.3. Ensure waterproofing materials are cured before covering with other materials.

C. Vegetation Handling: Install vegetation immediately upon delivery to site.

D. Installation:

1. Vegetation: Per optimal conditions, conducive to plant establishment and survival based upon local hardiness zone as defined by USDA. 2. All other components of vegetated roof assembly: At any time, adequate protection should be provided to prevent damage and erosion.

E. Foot Traffic: Prohibited on vegetated roof assembly during vegetation establishment period and thereafter except for vegetated roof maintenance purposes.

1.10 SUSTAINABLE CONDITIONS

A. Waste Management: Handle in accordance with Waste Management Plan, reviewed by [Departmental Representative] [DCC Representative] [Consultant]. Divert from landfill when possible. For the following waste materials: collect, separate, remove from site, [reuse,] [recycle,] and dispose of at appropriate facilities:

1. Paper, corrugated cardboard, plastic, polystyrene, packaging materials. 2. Metal: Fold up, flatten, place in designated area, divert from landfill to local facility for recycling. 3. Aggregate: Divert from landfill to local facility for reuse. 1.1.1.O.4. Gypsum: Divert from landfill to local facility for recycling. 1.1.1.O.5. Hazardous materials: Place in designated containers, handle and dispose of in compliance with [EPA] [and] [Regional and Municipal] regulations. Clearly label location of salvaged material’s storage areas and provide barriers and security devices. Ensure emptied containers are sealed and stored safely. Unused materials must be disposed of at official hazardous material collection sites: 1.1.1.O.6. Paint, coating materials. 1.1.1.O.7. Adhesive, sealant, and asphalt materials: Shall not be disposed of into sewer system, streams, lakes, onto ground, or in other location where it will pose health or environmental hazard.

B. Concept Design Strategy Requirements: An integral part of the Work as detailed in Section [01 81 13 “Sustainable Requirements: Concept Design”], including the following sustainable design concepts:

1. Holistic green design framework. 2. Descriptions of design criteria. 1.1.1.K.3. Sustainable goals based on project design decisions, delineated with measurable performance targets. 1.1.1.K.4. Operational requirements: Specified to transform design requirements into physical requirements.

C. Construction Requirements: An integral part of the Work as detailed in Section [01 81 13 “Sustainable Requirements: Construction”], including the following sustainable construction requirements:

1. Construction requirements: specific to project. 2. Specification text: Ensure that project will comply with green design process and sustainability requirements. 3. Administrative, temporary, procedural requirements: For use of materials and methods of construction.

D. Contractor Verification: An integral part of the Work as detailed in Section [01 81 13 “Sustainable Requirements: Contractor’s Verification”], including the following verification requirements:

1. Performance Verification: As specified in Section [01 81 13 “Sustainable Requirements: Construction”] 2. Compliance: Sustainable requirements specific to this technical section.

E. Operation and Maintenance Requirements: An integral part of the Work as detailed in Section [01 81 13 “Sustainable Requirements: Operation”], including the following operation requirements:

1. Products, materials, services, and methods: Consistent with procurement policy of eco-purchasing that reduces volume of wastes, material costs, toxicity of products and supports recycling.

1.11 WARRANTIES

A. Upon completion of the work, the contractor shall supply the owner with a single-source warranty of U.S. origin direct from the manufacturer.

B. Each warranty varies in scope and terms. Contact Tremco for exact warranty terms and conditions to meet specific project requirements.

C. Special Manufacturer's Warranty: Manufacturer's standard form in which waterproofing manufacturer agrees to furnish waterproofing material to repair or replace those materials installed according to manufacturer's written instructions that exhibit material defects or otherwise fail to perform as specified under normal use within warranty period specified.

1.1.1.A.1. Access for Repair: Owner shall provide unimpeded access to the Project and the waterproofing system for purposes of testing, leak investigation, and repair, and shall reinstall removed cladding and overburden materials upon completion of repair. 1.1.1.K.5. Cost Limitation: Manufacturer's obligation for repair or replacement shall be limited to the original installed cost of the work. 1.1.1.K.6. Warranty Period: [__] years date of Substantial Completion.

D. Special Warranty for Vegetated Roof Assembly: Provide manufacturer's standard warranty in which Manufacturer and Installer jointly agree to repair or replace vegetated roof assembly and components, including root barrier protection, horizontal insulation, drainage layer, water retention layer, drain inspection box, edging restraint, and excluding plant materials covered under separate warranty below, that fail in materials or workmanship within specified warranty period.

1.1.1.A.1. Manufacturer's warranty applies to Projects installed by Manufacturer-approved Installer and inspected by Manufacturer Technical Representative. 1.1.1.K.7. Warranty Period: [20] years from date of Substantial Completion.

E. Special Warranty for Plant Growth: Provide manufacturer's standard warranty in which Manufacturer and Installer jointly agree to repair or replace plantings and accessories that fail in materials, workmanship, or growth within specified warranty period.

1.1.1.A.1. Groundcover Foliage Cover: Plantings shall grow to achieve and maintain at least [85] percent foliage cover over planting area, when averaged within 2 square foot increments, commencing with installation, at the end of the warranty period. Provide extended warranty for remainder of original warranty period for replaced plant material. 1.1.1.K.8. Failures include, but are not limited to, death and unsatisfactory growth of plant materials except for defects resulting from abuse, neglect by Owner, or incidents that are beyond Contractor's control. 1.1.1.K.9. Warranty Periods from Date of Installation: 1.1.1.K.10. Ground Covers: [Two] years.

F. Special Warranty for Membrane Leak Detection System: Refer to Section 07 72 73 "Roof Accessories: Vegetation Roof Systems: Membrane Leak Detection System."

G. Special Warranty for Irrigation System: Refer to Section 32 84 00 "Planting Irrigation for Vegetated Roof."

1.12 MAINTENANCE SERVICE

A. Initial Maintenance Service for Plant Materials: Provide maintenance and general housekeeping of vegetated roof assembly by competent employees of vegetated roof assembly Installer. Maintain as required in Part 3. Begin maintenance immediately after plants are installed and continue until plantings are acceptably healthy and well established but for not less than the following maintenance period:

1. Site Visits: Provide monthly site visits during the first year to perform required tasks under this Service. Provide one site visit during Year Two by a qualified Manufacturer’s representative. 2. Nutrient Testing and Amending: Perform testing during second year of initial maintenance period and apply amendments to vegetated roof assembly as required. Comply with local watershed authority stormwater nutrient run-off restrictions. 3. Include the following remedial actions as a minimum: 4. During inspection, remove dead plants and replace unless required to plant in the succeeding planting season. 5. Repair thin areas with cuttings derived from site. Trim plants and remove weeds. Provide supplemental water if required at time of inspection and service. 6. Reports: Provide written report to Owner including health assessment of plant material and indication of work performed with each site visit. 7. Initial Maintenance Period: Equal to warranty period under "Special Warranty for Plant Growth" Paragraph above.

B. Continuing Maintenance Service: Provide maintenance and general housekeeping of vegetated roof assembly by competent employees of vegetated roof assembly Installer. Manufacturer's standard continuing maintenance agreement, commencing on date initial maintenance service under warranty is concluded. Include the following:

1. Site Visits: Provide not less than one visit per 2 months during the growing season per subsequent year to perform required tasks. 2. Nutrient Testing and Amending: Perform testing annually and apply amendments as required. 3. Supplemental Water: Add supplemental water as required to bring vegetated roof assembly up to recommended moisture content levels. Inform Owner of recommended adjustment to Owner's watering practices. 4. Weeding and Plant Material Housekeeping: Remove dead and damaged growth and weeds and debris. Dispose of debris onsite in Owner's container. EXTENSIVE VEGETATED ROOF ASSEMBLY 07 55 63 - 10 Copyright 2017 AIA Tremco, Inc.: VR UltraLite with TREMproof 250GC 01/17 Extra Lightweight Built-Up Vegetated Roof Assembly

5. General Housekeeping: Perform general rooftop housekeeping in accordance with requirements in Division 07 roofing section. 6. Reports: Provide report to Owner including health assessment of plant material and indication of work performed, with each site visit. 7. Continuing Maintenance Period: [20] years from date of substantial completion.

1.13 DELIVERY, STORAGE AND HANDLING OF MATERIALS

A. Pre-cultivated plant material shall be delivered in such a manner as to preserve the quality of the plants.

B. Truck delivery will be conducted in a manner to protect the vegetation mats from temperature or wind damage. For transport times less than 1 day, a closed or open trailer may be used. For longer duration transport times, vegetation mats shall be delivered in a climate-controlled trailer (e.g. refrigerated container).

C. Upon arrival, the mats shall be immediately off-loaded, plastic wrap removed (if applicable), and installed within 12 hours. If timely installation is not achievable, then a holding area shall be reserved to unroll and maintain mats until installation.

D. Non-living components such as root barrier, drainage mat, and water retention panels shall be kept dry and protected from the elements (e.g. cover with a water-resistant tarp) while storing on site.

PART 2 – PRODUCTS

2.1 SYSTEM BASIS

1.1.1.A.Supplier of vegetated roof assembly having systems and/or products approved for use, obtained as a single-source from the membrane/green roof manufacturer to ensure total system compatibility and integrity:

1.1.1.A.1. Membrane Assembly: TREMproof 250GC cold-fluid waterproofing system by Tremco Inc., www.tremcosealants.com

1.1.1.A.2. Extra Lightweight Built-Up Vegetated Roof Assembly: VR UltraLite Vegetated Roof Assembly System by Tremco Inc., www.tremcosealants.com

2.2 PERFORMANCE REQUIREMENTS

1.1.1.A.Waterproofing Membrane: Waterproofing system shall be capable of performing as a continuous watertight installation and as a moisture drainage plane transitioned to adjacent flashings and discharging water to the building exterior. Waterproofing shall accommodate normal substrate movement, construction material transitions, opening transitions, penetrations, and perimeter conditions without resultant moisture deterioration.

1.1.1.A.1. Compatibility: Provide waterproofing system materials that are compatible with one another and with adjacent materials under conditions of service and application required, as demonstrated by waterproofing manufacturer based on testing and field experience.

1.1.1.B. Vegetated Roof Assembly: Provide vegetated roof assembly that will support vegetation, with an initial average coverage of not less than 85 percent coverage within 24 months of installation.

Specifier: Water Capacity potential is determined by factoring the type of plant material.

1.1.1.C. Water Capacity: Provide vegetated roof assembly with water retention capacity of 0.88 gal/sq. ft. (35.9 L/sq. m) of water. Calculations include the combined water retention capacity of pre-vegetated mat and water retention layers.

When providing for a single VRA type, system superimposed dead load may be specified here; however, project structural engineers will typically indicate such special loading directly on Drawings, as authorities having jurisdiction typically require. When multiple VRA types are required in Project, locations of each and their respective superimposed dead loads must be shown on Drawings.

Do not duplicate drawing information in specifications. Coordinate loading requirements with Structural Engineer.

1.1.1.D.Structural Design Load: Provide vegetated roof assembly with superimposed dead load not exceeding [___ lb/sq. ft. (___ kg/sq. m)] [load indicated on Drawings]. Calculations must be based on saturated weight of all components of vegetated roof assembly.

1.1.1.E. Pre-Cultivated Vegetation Mat (includes Growing Media): Provide a vegetation mat that meets the following characteristics:

1.1.1.E.1.Depth: Not less than 0.75 inches (19 mm) [As indicated on Drawings]. 1.1.1.E.2.Saturated Weight: Not more than 8.0 lb./sq. ft. (39 kg/sq. m). 1.1.1.E.3.Dry Weight: Not less than 3.0 lb./sq. ft. (14 kg/sq. m). 1.1.1.E.4.Source Material: Recycled products. 1.1.1.E.5.Source Location: Locally to project site, within 500 mile (800 km) radius.

1.1.1.F. Sustainability: Components shall be made from recycled materials and sourced within 500 mile (800 km) radius of project site when possible.

2.3 WATERPROOFING MEMBRANE

1.1.1.A.Cold Fluid-Applied Waterproofing: Single component, reinforced, high solids, modified aliphatic polyurethane, ASTM C 836/C 836M and coal-tar free, formulated for application to damp and green concrete.

1.1.1.A.1. Basis of Design Product: Tremco, Inc., TREMproof 250GC. 1.1.1.A.2. VOC Content: Less than 100 g/L, roller and self-leveling grades. 1.1.1.A.3. VOC Content: Less than 160 g/L, trowel detailing grade. 1.1.1.A.4. Hardness, ASTM D 2240: 70 – 80. 1.1.1.A.5. Low Temperature Flexibility and Crack Bridging, ASTM C 1305: Pass. 1.1.1.A.6. Adhesion in Peel, ASTM C 794: 26 lbf/in. (4553 N/m).

2.4 ACCESSORY MATERIALS

1.1.1.A.General: Accessory materials as described in manufacturer's written installation instructions, recommended to produce complete waterproofing system meeting performance requirements, and compatible with waterproofing material and adjacent materials.

1.1.1.G.Substrate Patching Material: Waterproofing manufacturer's standard trowel-grade filler material.

1.1.1.H.Primer: Liquid primer meeting VOC limitations and recommended for substrate by waterproofing manufacturer.

1.1.1.I. Elastomeric Detail Sheet: Blended thermoset elastomeric sheet reinforced with polyester woven scrim.

1.1.1.A.2. Basis of Design Product: Tremco, Inc., TRA Elastomeric Sheeting.

1.1.1.J. Metal Termination Bars: Waterproofing manufacturer's standard aluminum or stainless steel termination bar, with stainless steel fasteners.

1.1.1.K.Termination Mastic: Waterproofing manufacturer's standard cold fluid-applied elastomeric liquid; trowel grade, with recommended glass-fiber-mesh tape.

1.1.1.L. Joint Sealant: ASTM C 719, high performance, medium-modulus, low-VOC, UV-stable, non-sag polyurethane sealant approved by waterproofing manufacturer for adhesion and compatibility with waterproofing and accessories.

1.1.1.A.3. Basis of Design Product: Tremco, Inc., Dymonic 100.

2.5 VEGETATED ROOF ASSEMBLY COMPONENTS

Specifier: Retain one the following three "Root Barrier" paragraphs below if using within VRA over asphaltic- based membrane; delete if installing over single-ply membrane sheet approved for use as a root barrier.

A. Root Barrier: Heavy-duty 4-ply laminate polymer film, re-inforced with a layer of high strength cord grid, flame-retardant. Use with Manufacturer’s recommended technical seam tape.

1. Basis of Design Product: Tremco, Inc., VR RootBloc 10. 2. Physical Properties: 1.1.1.A.1.a. Thickness: 10 mil (0.25 mm). 3. Mechanical Properties: 1.1.1.A.1.b. Elongation at break, ASTM D 7003: 500%. 1.1.1.A.1.c. 1” Tensile Strength, ASTM D 7003: 60 lbf/in (267 N/cm). 1.1.1.A.1.d. Grab Tensile Strength, ASTM D 7004: 80 lbf (356 N). 1.1.1.A.1.e. Trapezoid Tear, ASTM D 4533: 52 lbf (231 N). 1.1.1.A.1.f. Hydrostatic Resistance, ASTM D 751: 74 psi (510 kPa). 1.1.1.A.1.g. Mullen Burst, ASTM D 751: 90 psi (621 kPa). 4. Flame Spread Index – Class “A”, ASTM E 84: 5.

B. Root Barrier: Heavy-duty blended linear polyethylene membrane, infused with carbon black additive for UV resistance. Use with Manufacturer’s recommended technical seam tape.

1. Basis of Design Product: Tremco, Inc., VR RootBloc 20. 2. Physical Properties: 1.1.1.A.3.a. Thickness: 20 mil (0.5 mm). 3. Mechanical Properties: 1.1.1.A.3.b. Elongation at break, ASTM D 7003: 500%. 1.1.1.A.3.c. 1” Tensile Strength, ASTM D 7003: 2610.6 lbf/in² (18 Mpa) 1.1.1.A.3.d. Tear Resistance, ASTM D 1004: 342.6 lbf/ in (60 N/mm).

C. Root Barrier: Heavy-duty blended linear polyethylene membrane, infused with carbon black additive for UV resistance. Use with Manufacturer’s recommended 4-inch (100 mm) technical seam tape. Heat welding is an option.

1. Basis of Design Product: Tremco, Inc., VR RootBloc 40. 2. Physical Properties: a. Thickness: 40 mil (1.00 mm). 3. Mechanical Properties: 1.1.1.A.1.a. Elongation at break, ASTM D 6693: 800%. 1.1.1.A.3.e. 1” Tensile Strength, ASTM D 6693: 154 lbf (270 N). 1.1.1.A.3.f. Tear Resistance, ASTM D 1004: 22 lbf (98 N). 1.1.1.A.3.g. Puncture Resistance, ASTM D 4833: 60 lbf (267 N). 1.1.1.A.3.h. Mullen Burst, ASTM D 751: 220 psi (1517 kPa).

Specifier: Retain “Horizontal Insulation” paragraph below for projects where a protected roofing membrane configuration is used.

D. Horizontal Insulation: Extruded-polystyrene board insulation, ASTM C 578, of type and minimum compressive strength indicated below, with maximum flame-spread and smoke-developed indexes of 75 and 450, respectively, per ASTM E 84, unfaced; fabricated with shiplap or channel edges.

Specifier: Retain paragraphs below based on project requirements for compressive strength. If retaining more than one type of extruded polystyrene insulation board, indicate location of each on drawings or by inserted description.

1.1.1.A.1. Type VI, 40 psi (276 kPa). 1.1.1.L.1.Type VII, 60 psi (414 kPa). 1.1.1.L.2.Thickness: As indicated on Drawings. 1.1.1.L.3.R-value: 5 per inch. 1.1.1.L.4.Product shall be free of CFC’s.

1.1.1.E. Drainage Layer: Three-dimensional woven polypropylene mat, open weave with filter fabric laminated to top surface, consisting of a consisting of a minimum of 40% recycled content.

1.1.1.E.1.Basis of Design Product: Tremco Inc., VR AeroMat 0.40. 1.1.1.E.2. Physical Properties: 1.1.1.E.2.a. Thickness: 0.45 in (11.4 mm). 1.1.1.E.3.Mechanical Properties: 1.1.1.E.3.a. Elongation, ASTM D 4632: 50%. 1.1.1.E.3.b. Grab Tensile Strength, ASTM D 4632: 120 lbf (534 N). 1.1.1.E.3.c. Trapezoid Tear, ASTM D 4533: 50 lbf (223 N). 1.1.1.E.3.d. Puncture Strength, ASTM D 6241: 70 lbf (310 N). 1.1.1.E.3.e. Compressive Load, ASTM D 4716: 30,000 psf (1436 kPa). 1.1.1.E.4.Hydraulic Properties: 1.1.1.E.4.a. Water Flow Rate, ASTM D 4491: 120 gpm/sq. ft. (4887 Lpm/sq. m). 1.1.1.E.4.b. Permittivity, ASTM D 4491: 1.8 sec^-1.

1.1.1.F. Water-Retention Layer: Needle punched nonwoven fabric made of high-quality recycled mixed fibers, capable of retaining additional moisture for use by vegetation.

1.1.1.F.1. Basis of Design Product: Tremco Inc., VR MoistureMat

1.1.1.F.2. Physical Properties: 1.1.1.F.2.a. Thickness: 0.4 in (10 mm). 1.1.1.F.2.b. Roll Dimensions: 4.3 ft x 65.6 ft (1.3 m x 20 m). 1.1.1.F.3. Mechanical Properties: 1.1.1.F.3.a. Longitudinal Elongation at break, ASTM D 6693: 100% 1.1.1.F.3.b. Lateral Elongation at break, ASTM D 6693: 140% 1.1.1.F.3.c. Longitudinal Tensile Strength, ASTM D 6693: 1798.5 lbf (8 kN/m). 1.1.1.F.3.d. Lateral Tensile Strength, ASTM D 6693: 899 lbf (4 kN/m). 1.1.1.F.3.e. Trapezoid Tear, Typical Value, ASTM D 4533: 25 lbf (112 N). 1.1.1.F.4. Hydraulic Properties: 1.1.1.F.4.a. Water Retention Capacity: 0.22 gal/sq. ft. (9.1 L/sq. m).

1.1.1.G.Technical Seam Tape: Self-adhered, waterproof membrane with acrylic pressure sensitive adhesive.

1. Basis of Design Product: Tremco Inc., VR TecTape 2. 2. Physical Properties: 1.1.1.A.1.a. Thickness: 9.9 mil (0.25 mm). 3. Mechanical Properties: 1.1.1.G.1.a. Nail Sealability, ASTM E 331/547 (per AAMA 711-07, Annex 1): Pass both before and after thermal cycling.

Specifier: Edging is not required but may be used depending on type of vegetation-free zone.

1.1.1.H.Edging Restraint: Manufacturer’s standard L-shaped edging with top lip, formed from extruded aluminum. Solid at growing layer to prevent rooting and plant growth through the edging. Perforated at drainage course level to allow for free drainage. Use with Manufacturer’s edge connectors, edge corners, and edge leveling strips.

1.1.1.H.1. Basis of Design: Tremco, Inc., VR EdgeGuard 3. 1.1.1.H.2. Physical Properties: 1.1.1.H.2.a. Thickness: 80 mil (2.03 mm). 1.1.1.H.2.b. Height: 3 in (76.2 mm). 1.1.1.H.2.c. Flange Length: 4 in (101.60 mm). 1.1.1.H.2.d. Length: 8 ft (2.5 m). 1.1.1.H.2.e. Lip: 3/8 in (9.525 mm). 1.1.1.H.2.f. Perforations, diameter: 3/4 in (19 mm).

Specifier: Drain Inspection Box is not required but may be used depending on VR Design.

1.1.1.I. Drain Inspection Box: Manufacturer’s standard drain inspection box formed from aluminum, with lockable lid and perforated at drainage course level.

1.1.1.I.1. Basis of Design: Tremco Inc, VR DrainGuard 4. 1.1.1.I.2. Physical Properties: 1.1.1.I.2.a. Thickness: 60 mil (1.52 mm). 1.1.1.I.2.b. Dimensions: 15 in x 15 in (375 mm x 375 mm). 1.1.1.I.2.c. Height: 6 in (152 mm). 1.1.1.I.2.d. Perforations, diameter: 3/4 in (19 mm).

2.6 PRE-CULTIVATED VEGETATION MAT (INCLUDES GROWING MEDIA)

1.1.1.A.Pre-cultivated vegetation mats are grown on flexible vegetation carrier and contains both the required growing medium and a mixture of 9-15 species of pre-cultivated, low-profile, drought-tolerant vegetation (such as sedums, delosperma and portulaca). Expect variation in final makeup and appearance based on geographic location and plant availability. Mats are supplied to site either in rolls or in flat sheets and with a minimum of 85% vegetation coverage.

1.1.1.A.1. Basis of Design Product: Tremco Inc., VR Sedum Mat 1.1.1.A.2. Physical Properties: 1.1.1.A.2.a. Thickness: 0.75 inch (19 mm). 1.1.1.A.2.b. Roll Dimensions: [39 in x 39 in (1 m x 1 m)] [39 in x 78 in (1 m x 2 m)]. 1.1.1.A.3. Mechanical Properties: 1.1.1.A.3.a. Maximum Saturated Weight: 6 - 8 lb./sq. ft. (29 - 39 kg/sq. m).

2.7 VEGETATION-FREE ZONE MATERIALS

Specifier: Retain one or both of the following two paragraphs “Walkway Roof Pavers” or “Aggregate Ballast” below based on project design for vegetation-free zone.

1.1.1.A.Walkway Roof Pavers: pre-cast concrete pavers with pedestals.

1.1.1.A.1. Basis of Design: Armtec, Pedslab. 1.1.1.A.2. Physical Properties: 1.1.1.A.2.a. Size: 24 in x 24 in (610 mm x 610 mm). 1.1.1.A.2.b. Thickness: 2-1/4 in (57 mm). 1.1.1.A.2.c. Weight: 11 lb/sq. ft. (54 kg/sq. m), minimum. 1.1.1.A.2.d. Colors and Textures: natural color with shot blast finish. 1.1.1.A.3. Mechanical Properties: 1.1.1.A.3.a. Compressive Strength: 8000 psi (55 MPa), minimum. 1.1.1.A.3.b. Absorption: 5%, maximum. 1.1.1.A.3.c. Freeze-thaw Resistance: 1.0% loss in weight after 40 cycles, maximum. 1.1.1.A.4. Paver Supports: Paver manufacturer's standard SBR rubber, high-density polyethylene, or polyurethane paver support assembly, including [fixed-height] [adjustable or stackable] pedestals, shims, and spacer tabs for joint spacing of 1/8 to 3/16 inch (3 to 5 mm).

1.1.1.B. Aggregate Ballast: ASTM D 1863, No. 6 or No. 67, clean, dry, opaque, water-worn gravel, free of sharp edges.

1.1.1.B.1. Size: ASTM D 448, Size 4, 3/4 to 1-1/2 in (19 to 38 mm).

PART 3 - EXECUTION

3.1 EXAMINATION

1.1.1.A.Surface Condition for Waterproofing: Before applying waterproofing materials, examine substrate and conditions to ensure substrates are fully cured, smooth, clean, dry, and free from high spots, depressions, loose and foreign particles and other deterrents to adhesion, and conditions comply with manufacturer's written recommendations.

1.1.1.A.1. Verify concrete and masonry surfaces are visibly dry, have cured for time period recommended by waterproofing manufacturer, are free from release agents, curing agents, laitance, and other contaminates, and have adequate profile for adhesion of product.

1.1.1.A.2. Test for capillary moisture by plastic sheet method according to ASTM D 4263. 1.1.1.A.3. Test for waterproofing adhesion per manufacturer's recommended method. 1.1.1.A.4. Verify masonry joints are filled with mortar and struck flush. 1.1.1.A.5. Verify drains have suitable flanges at membrane level flush with deck surface. 1.1.1.A.6. Verify deck penetrations including pipes, conduits, and vents are rigidly installed and flashed and ready to receive waterproofing application. 1.1.1.A.7. Notify Architect of unsatisfactory conditions.

1.1.1.B. Surface Condition for Vegetated Roof: Examine surfaces and report any adverse conditions that may negatively impact appearance or performance of vegetated roof system. Ensure all unacceptable conditions are corrected before proceeding. Coordinate sequencing of waterproofing work and vegetated roofing work with work of other sections.

1.1.1.B.1. Verify that roof insulation over membrane roofing is in place, secure, and flush along all seams. 1.1.1.B.2. Verify that perimeter and other flashings are in place and secure along entire lengths where vegetated roof assembly will cover them.

1.1.1.C. Ensure adequate provisions have been made for loading, unloading, storage, parking and access to roof site.

1.1.1.D.Execute work in accordance with the specification, drawings and details.

1.1.1.E. Report any imbedded object or obvious damage to Consultant.

1.1.1.F. Ensure all equipment is in good working order. Protect all equipment that comes into contact with roofing membrane, flashings and related work.

1.1.1.G.Ensure adequate safety equipment has been obtained for all operations.

1.1.1.H.Proceed with installation of vegetated roof assembly only after unsatisfactory conditions have been corrected.

3.2 PREPARATION

1.1.1.A.General: Protect structures, utilities, sidewalks, pavements, and other facilities and areas from damage caused by installation.

1.1.1.B. Protect waterproofing according to the following written recommendations to prevent damage and wear during examination, testing, installation, and remainder of construction period:

1.1.1.B.1. Clean, prepare, and treat substrates in accordance with waterproofing manufacturer's written instructions including published details.

1.1.1.B.1.a. Mask adjacent finished surfaces. 1.1.1.B.1.b. Remove contaminants and film-forming coatings from substrates. 1.1.1.B.1.c. Remove projections and excess materials and fill voids with substrate patching material. 1.1.1.B.1.d. Prepare and treat joints and cracks in substrate per ASTM D 4258 and waterproofing manufacturer's written instructions. 1.1.1.B.1.e. Close off deck drains and other deck penetrations to prevent spillage and migration of waterproofing fluids.

1.1.1.B.2. Metal Flashings: Where metal flashings are substrate to waterproofing membrane, set the flashings in continuous bedding bead of urethane sealant; install sealant S-bead between metal laps and mechanically fasten to substrate along leading edges at every 4" on center, staggered linearly, to lay flat without fishmouths.

1.1.1.B.3. Detail Preparation: Prepare non-moving shrinkage cracks, large cracks, construction joints, expansion joints, projections and protrusions, penetrations, drains, and changes in plane in accordance with waterproofing manufacturer's written instructions and details, using accessory materials specified.

1.1.1.B.3.a. Prime substrates as required. 1.1.1.B.3.b. Adhere strips of elastomeric sheet to moving joints and large cracks by embedding in a layer of hot rubberized asphalt and overlay with coat of hot rubberized asphalt.

1.1.1.B.4. Transitions to Adjacent Materials: Install elastomeric and composite reinforced flashing to form connect and seal waterproofing material to adjacent components of building waterproofing system, including, but not limited to, roofing system waterproofing, exterior fenestration systems, door framing, and other openings

1.1.1.B.4.a. Seal top of through-wall flashings to waterproofing with continuous transition strips of type recommended by waterproofing manufacturer for application. 1.1.1.B.4.b. Install elastomeric sheets at terminations of waterproofing membrane according to manufacturer's written instructions. 1.1.1.B.4.c. Install termination bars and mechanically fasten to top of elastomeric flashing sheet at terminations and perimeter of waterproofing.

3.3 WATERPROOFING INSTALLATION

A. General: Apply waterproofing material to form a seal with strips and transition strips and to achieve a continuous waterproofing according to waterproofing manufacturer’s written instructions. Apply waterproofing material within manufacturer’s recommended application temperature ranges.

B. Primer:

1.1.1.B.1. Apply primer to substrates at required rate, using roller, brush, or airless spray. Allow to dry. 1.1.1.B.2. Re-prime areas not covered within 24 hours.

1.1.1.C. Membrane:

1.1.1.C.1. Install membrane according to manufacturer’s written instructions. 1.1.1.C.2. Heat rubberized asphalt in an oil- or –air-jacketed melter with mechanical agitator specifically designed for heating rubberized asphalt. 1.1.1.C.3. Start application with manufacturer’s authorized representative present. 1.1.1.C.4. Apply waterproofing in total wet film thickness recommended in writing by waterproofing manufacturer, but not less than 215-mil (5.5 mm) wet film thickness, applied in two or more equal coats applied using methods recommended by waterproofing manufacturer, as follows: 1.1.1.C.4.a. Apply first coat at minimum thickness of 90 mils (2.3 mm). 1.1.1.C.4.b. Thoroughly embed reinforcing fabric in first coat while still liquid, with slight overlap of fabric edges.

1.1.1.C.4.c. Apply second coat at not less than 125 mils (3.2 mm) and as required to achieve total thickness of not less than 215 mils (5.5 mm).

1.1.1.D. Terminations:

1.1.1.D.1. Install terminations of waterproofing membrane in accordance with ASTM C 898 and ASTM C 1471, as application to application, at not less than minimum height recommended by waterproofing manufacturer. 1.1.1.D.2. Overlap waterproofing on to intersecting construction a minimum of 24 inches (600 mm).

1.1.1.E. Coordination of Testing:

1.1.1.E.1.Coordinate application of waterproofing membrane with installation of membrane leak detection system specified in Section 07 72 73 "Membrane Leak Detection System." 1.1.1.E.2.Do not cover waterproofing until it has been tested and inspected by Owner's testing agency.

1.1.1.F. Correct deficiencies in or remove waterproofing that does not comply with requirements; repair substrates and reapply waterproofing components.

1.1.1.G.Separation/Protection Course Installation:

1.1.1.G.1. Install protection course as per manufacturer’s written instructions.

1.1.1.H.Membrane Integrity Test (EFVM):

1.1.1.H.1. Install as per manufacturer’s written instructions.

Specifier: Retain components listed in "Vegetated Roof Assembly Installation" paragraphs below that are required for specific installation; delete unneeded items. Coordinate with products retained in Part 2.

3.4 VEGETATED ROOF ASSEMBLY INSTALLATION

1.1.1.A. Installation, General: Install vegetated roof assembly components according to Manufacturer's written instructions and approved shop drawings.

1.1.1.B. The various layers shall be installed in such manner as not to damage or disrupt any previously installed roofing components.

Specifier: Retain one of the three following “Root Barrier” sections based on project design.

Specifier: Retain the following “Root Barrier” section if using VR RootBloc 10 or VR Rootbloc 20 and sealing seams with technical tape.

1.1.1.C. Root Barrier:

1.1.1.C.1. Place root barrier continuously over finished membrane surface, including all vertical surfaces and projections. 1.1.1.C.2. Overlap all side and end laps a minimum of 4 inches (100 mm) and seal with Manufacturer’s 2-inch-wide (50 mm) technical tape. Allow for root barrier to reach up all verticals 1-inch (25 mm) above the intended vegetation line and secure with Manufacturer’s technical tape.

Specifier: Retain the following “Root Barrier” section if using VR RootBloc 40 and sealing seams with technical tape.

1.1.1.D.Root Barrier:

1.1.1.D.1. Place root barrier continuously over finished membrane surface, including all vertical surfaces and projections. 1.1.1.D.2. Overlap all side and end laps a minimum of 4 inches (100 mm) and seal with Manufacturer’s 4-inch-wide (100 mm) technical tape. Allow for root barrier to reach up all verticals 1-inch (25 mm) above the intended vegetation line and secure with Manufacturer’s technical tape.

Specifier: Retain the following “Root Barrier” section if using VR RootBloc 10, VR RootBloc 20, or VR RootBloc 40 and sealing product with heat weld and termination bars.

1.1.1.E. Root Barrier:

1.1.1.E.1.Place root barrier continuously over finished membrane surface, including all vertical surfaces and projections. 1.1.1.E.2.Overlap all side and end laps a minimum of 4 inches (100 mm) and heat weld all seams watertight per Manufacturer’s specifications. 1.1.1.E.3.Allow for root barrier to reach up all verticals 1-inch (25 mm) above the intended vegetation line and secure below perimeter counter flashing with continuous termination bar per Manufacturer’s approved details.

Specifier: Retain the following “Horizontal Insulation” section below for projects where a protected roofing membrane configuration is used.

1.1.1.F. Horizontal Insulation:

1.1.1.F.1. Loosely lay insulation in parallel courses, staggering end laps and side laps. Abut edges and ends between units. 1.1.1.F.2. Cut insulation to fit neatly at projections and terminations with less that 1-inch (25 mm) tolerance.

Specifier: Retain the following “Edging Restraint” section for projects where edging is used.

1.1.1.G.Edging Restraint:

1.1.1.G.1. Install edging along perimeter border between vegetation-free area and vegetated area, according to Manufacturer’s instructions and approved shop drawings. 1.1.1.G.2. When joining two sections together, ensure a tight fit at all joints. Place edge connector piece on top so it overlaps both ends of joints. Secure with self-tapping screws. 1.1.1.G.3. At corners, cut as required for clean, mitered finish. Finish with edge corner piece and secure with self-tapping screws. 1.1.1.G.4. Along slopes, use edge leveling strip as needed to create level, clean edging lengths. Install on outside of edging restraint, making sure to overlap the bottom of the leveling strip with the top of the edging restraint by a minimum of 2-inch (50 mm). Secure with self-tapping screws. 1.1.1.G.5. Ensure base flange is pointed towards the vegetated areas.

Specifier: Retain the following “Drain Inspection Box” section for projects where drain inspection box(es) are used.

1.1.1.H. Drain Inspection Box:

1.1.1.H.1. Install inspection box centered over drains directly on top of drainage layer. Ensure the bottom inner edge of the inspection box is outside of the outer edge of the drain flange. 1.1.1.H.2. Insert retaining pin into locking pin to lock lid of inspection box.

1.1.1.I. Drainage Layer: Install drainage layer with fabric surface side facing up.

1.1.1.I.1. Lay rolls of drainage layer over insulation up to vertical edging, overlapping fabric lap ends on adjacent rolls. 1.1.1.I.2. Cut tightly around any projections, drains, etc.

1.1.1.J. Water Retention Layer:

1.1.1.J.1. Install one layer of water retention layer on top of the drainage layer. Each row of adjacent mats shall be offset by at least 6.5 ft (2 m) to avoid alignment of end seams across rows. 1.1.1.J.2. Cut tightly around any projections, drains, etc. 1.1.1.J.3. Install a second layer of water retention layer in the same manner. 1.1.1.J.4. Install the second layer 90 to the first layer if feasible. Otherwise, install the second layer in the same direction as the first but offset the top and bottom layers by half the width.

1.1.1.K.Pre-cultivated vegetation mat:

1.1.1.A.1.a. Install the pre-cultivated vegetation mat on top of the water retention layers. Each row of adjacent vegetation mats shall be offset by half the length of an individual mat to avoid alignment of end seams across rows. Cut to fit along roof edge and around penetrations.

1.1.1.A.1.b. Upon complete installation of the mats, it may be necessary to redistribute and/or supplement the substrate to ensure even coverage across the vegetation mat. In areas or alongside edges where substrate is lost during transport and handling, new substrate must be added to support vegetative growth.

1.1.1.A.1.c. Water the assembled vegetation system immediately and thoroughly after installation to assist with settling of individual components and to support recovery and establishment of vegetation.

3.5 VEGETATION-FREE ZONE INSTALLATION

Specifier: Where a protected membrane assembly is used, place roof pavers directly on top of insulation.

1.1.1.A.Roof Pavers: To roofed area, place roof pavers and cut to fit. Push pavers against edging and ensure there is a tight fit between parapet wall and edging.

1.1.1.A.2. Install roof pavers on paver supports set according to Manufacturer's written instructions. 1.1.1.A.3. Tolerances: 1.1.1.A.3.a. Install pavers to vary not more than 1/16 inch (1.59 mm) in elevation between adjacent pavers and not more than 1/16 inch (1.59 mm) from surface plane elevation of individual paver.

1.1.1.A.3.b. Maintain tolerances of paving installation within 1/4 inch (6.35 mm) in 10 feet (3.048 m) of surface plane in any direction.

1.1.1.B. To roofed area, apply aggregate ballast uniformly at rate required by manufacturer, but not less than the following, carefully spreading aggregate to not damage roofing membrane and base flashings. Apply ballast as insulation is installed, leaving roofing membrane insulated and ballasted at end of workday.

1.1.1.A.1. Ballast: [15 lb/sq. ft. (75 kg/sq. m)] [20 lb/sq. ft. (100 kg/sq. m)], aggregate within [102 inches (2600 mm)] of roof perimeter and corners and [24 inches (600 mm)] of roof penetrations; 10 lb/sq. ft. (50 kg/sq. m) aggregate elsewhere.

1.1.1.A.1.a. Install two rows of walkway roof pavers in lieu of aggregate ballast at roof perimeter, corners, and penetrations [unless otherwise indicated on Drawings].

3.6 FIELD QUALITY CONTROL

1.1.1.A.Manufacturer's Field Service: Engage membrane roofing and vegetated roof assembly Manufacturer's authorized technical service representative to provide full-time inspection of vegetated roof assembly installation and prepare interim and final inspection reports.

1.1.1.C. Correct identified deficiencies or irregularities in work that do not comply with requirements.

3.7 PLANT MAINTENANCE

1.1.1.A.General: During maintenance period prior to substantial completion [and during warranty period], maintain plantings by pruning, cultivating, supplemental watering if required, weeding, fertilizing if required, removal of debris from drainage areas, adjusting and repairing devices, resetting plants to proper elevations or vertical position, and performing other operations as required to establish healthy, viable plantings.

1.1.1.D.Maintain integrated pest management program to keep plant materials and planted areas free of pests and pathogens or disease following recommendations of USEPA as appropriate to minimize the use of pesticides and reduce hazards.

1.1.1.E. Use only products and methods acceptable to membrane roofing Manufacturer.

3.8 CLEANING AND PROTECTION

1.1.1.A.During planting and maintenance, keep adjacent areas and construction clean and maintain work area in an orderly condition.

1.1.1.F. Protect vegetated roof assemblies from damage due to planting operations and operations of other contractors and trades. Repair or replace damaged vegetated roof assemblies.

END OF SECTION 07 55 63

EXTENSIVE VEGETATED ROOF ASSEMBLY 07 55 63 - 22