<p>Backstop NT™ - Texture A High Performance, Water-Resistive DUK176 Membrane and Air Barrier</p><p>Backstop NT - Texture Specifications Backstop NT - Texture Specification DUK176 DRYVIT UK LTD. MANUFACTURER’S SPECIFICATION SECTION 07240 BACKSTOP NT - TEXTURE AIR AND MOISTURE BARRIER PART I - GENERAL horizontal surfaces or below purchased from Dryvit or its grade applications. authorized distributor. 1.01 SUMMARY 3. Backstop NT - Texture shall a. Materials shall be A. This document contains the not be exposed to weather manufactured at a facility manufacturer’s requirements for for longer than 30 days prior covered by a current the proper design, use, and to being covered. ISO 9001 certification. installation of the Dryvit 4. The substrate system shall Certification of the facility Backstop NT - Texture air and be designed so that shall be done by a moisture barrier. This maximum deflections do not registrar accredited by document is intended to be exceed L/240. the American National used in conjunction with: C. Performance Requirements: Standards Institute, 1. DUK177 - Backstop NT - Backstop NT – Texture shall Registrar Accreditation Texture Application meet the following performance Board (ANSI-RAB). Instructions criteria: 2. Contractor: Shall be 2. DUK453 - Backstop NT - 1. Water Vapor Transmission: experienced and competent Texture Product Sheet (ASTM E96) - Vapor in the application of the 1.02 DESCRIPTION Permeable Dryvit Exterior Insulation and A. General: The Backstop NT – 2. Flexibility: (ASTM D522) Finish Systems and shall Texture is a non-cementitious, Passes 3 mm (1/8 in) possess a current trained polymer-based, water resistant, mandrel contractor certificate* from protective coating used as a 3. Tensile Bond: (ASTM C297) Dryvit. secondary weather barrier and – Minimum 15 psi EPS 3. Due to variations in textures air barrier for use over failure. of CMU and concrete approved exterior substrates, in 4. Tensile Strength: surfaces, a minimum of 1.8 conjunction with Dryvit’s (ASTM D2370) -160 psi m x 1.8 m (6’ x 6’) test area Outsulation and Outsulation 5. Elongation: (ASTM D2370) - must be done to insure that Plus™ Exterior Insulation and 17% all surfaces of CMU and Finish Systems. 6. Wind Driven Rain: mortar joints can be covered, B. Design Requirements (FS TT-C-555B) - No but not filled, with the 1. Acceptable surfaces for moisture penetration Backstop – Texture using Backstop NT - Texture 7. Moisture Resistance: the methods described in include: (ASTM 2247) - No DS177. deleterious effects a. Core treated exterior 1.05 DELIVERY, STORAGE, AND grade gypsum sheathing 8. Flame Spread/Smoke Development: (ASTM E84) - HANDLING meeting ASTM C79 A. All Dryvit materials shall be b. Fiberglass mat-faced Flame Spread 5, Smoke Development 20 delivered to the job site in the exterior gypsum original, unopened packages sheathing meeting ASTM 1.03 SUBMITTALS with labels intact. C1177 A. Product Data - The contractor B. Upon arrival, materials shall be c. Exterior, cement and shall submit to the inspected for physical damage, calcium silicate sheathing owner/architect manufacturer’s freezing, or overheating. d. Minimum 13 mm (1/2 in), product data sheets describing Questionable materials shall not 4-ply, APA Exterior products which will be used on be used. Grade, CD-X plywood, this project. C. Materials shall be stored at the installed with the C face B. Samples - As required for the job site in a cool, dry location, out. specific Exterior Insulation and out of direct sunlight, protected e. Unpainted CMU or Finish System specified. from weather and other concrete damage. Minimum storage CAUTION: Application over 1.04 QUALITY ASSURANCE temperature shall be 4 °C oriented strand board (OSB) A. Qualifications (40 °F). sheathing and preservative or 1. Product Manufacturer: Shall fire retardant treated wood is be Dryvit UK Ltd. All 1.06 PROJECT CONDITIONS not recommended. materials shall be A. Environmental Requirements 2. Backstop NT - Texture is not manufactured or sold by 1. At the time of application, the intended to be used as Dryvit and shall be air and wall surface waterproofing for exterior temperatures shall be 2 Backstop NT - Texture Specification DUK176 minimum 4 °C (40 °F) and PART II PRODUCT 3.02 SURFACE PREPARATION rising at the time of A. The substrate shall be prepared application of Backstop NT - 2.01 MANUFACTURER so as to be free of foreign Texture. These A. All materials shall be obtained materials such as oil, dust, dirt, temperatures shall be from Dryvit or its authorized paint, wax, water repellents, maintained, with adequate distributors. moisture, frost efflorescence air ventilation and circulation, 2.02 COMPONENTS and any other materials that for a minimum of 12 hours A. Backstop NT - Texture: A fully inhibit adhesion. thereafter, or until the formulated, non-cementitious, 3.03 INSTALLATION products are dry. water-based material applied B. Existing Conditions -The A. General: Backstop NT - over approved substrates to Texture shall be applied in contractor shall have access provide water resistance and air to electric power, clean water, accordance with current, barrier properties. published Backstop NT - and a clean work area at the B. Dryvit Grid Tape: A 100 mm location where the Backstop Texture Application Instructions, (4 in) wide, open weave DUK177. NT - Texture materials are to fiberglass mesh tape used to be applied. B. Backstop NT - Texture is reinforce sheathing joints and shipped in 19 L (5 gal) pails and 1.07 SEQUENCING AND exposed edges of sheathing. is ready to use without SCHEDULING C. Dryvit Flashing Tape: A high- additives. A. Installation of the Backstop NT - density, polyethylene backed, C. Using a Wind-lock BM-1 or BM- Texture shall be coordinated tape with a rubberized asphalt 8 mixing blade, or equivalent, with other construction trades. adhesive. powered by a 13 mm (1/2 in) D. Dryvit Flashing Tape Surface drill, at 400-500 rpm, mix the 1.08 LIMITED MATERIALS Conditioner: A water-based Backstop NT - Texture material WARRANTY surface conditioner and to a smooth homogeneous A. Backstop NT - Texture is adhesion promoter for the consistency prior to use. covered by and subject to the Dryvit Flashing Tape. D. Apply a strip of Grid Tape over terms and conditions of Dryvit’s PART III-EXECUTION all sheathing joints, including limited materials warranty inside and outside corners. applicable to the specific Dryvit 3.01 EXAMINATION E. Depending on the substrate, system used. A. Prior to application of Backstop NT - Texture may be 1.09 DESIGN RESPONSIBILITY Backstop NT - Texture, the applied using a roller, spray A. It is the responsibility of both the contractor shall ensure that the equipment and backrollered or specifier and the purchaser to substrate is of a type listed in a trowel. Follow printed determine if a product is Section 1.02.B.1. Backstop NT - Texture suitable for its intended use. B. Ambient and surface Application Instructions, The designer selected by the temperatures are minimum 4 °C DUK177, for specific purchaser shall be responsible (40 °F) and rising. requirements. for all decisions pertaining to C. The substrate shall be flat within F. While the Backstop NT - design, detail, structural 6.4 mm (1/4 in) in a 1.2 m (4 ft) Texture is still wet, using a capability, attachment details, radius. CMU mortar joints shall trowel or spatula, smooth out shop drawings, and the like. be struck flush, tooled mortar the Backstop NT – Texture Dryvit has prepared guidelines joints and heavily textured CMU around all window and door in the form of specifications and (not split faced) shall be “skim perimeters, and other areas that product sheets to facilitate the coated” with Genesis or will receive Flashing Tape. design process only. Dryvit is Genesis DM. G. Allow to dry a minimum of not liable for any errors or D. Sheathing gaps shall not 4 hours prior to application of omissions in design, detail, exceed 6.4 mm (1/4 in). Larger Flashing Tape and adhesively structural capability, attachment gaps shall be corrected by applied EPS insulation board. details, shop drawings, or the replacing sheathing material. Cool damp weather will require like, whether based upon the E. The contractor shall notify the longer drying times. Flashing information prepared by Dryvit general contractor and/or Tape Surface Conditioner must or otherwise, or for any architect and/or owner of all be used for proper Flashing changes which purchasers, discrepancies. Work shall not Tape adhesion. specifiers, designers, or their proceed until discrepancies H. Install the specified Exterior appointed representatives may have been corrected. Insulation and Finish System make to Dryvit’s published per published installation comments. instructions for the specific system being used.</p><p>3 Backstop NT - Texture Specification DUK176</p><p>4 3.04 FIELD QUALITY CONTROL 3.06 PROTECTION A.The contractor shall be A. The Dryvit materials and the responsible for the proper project shall be protected from application of the Dryvit damage and weather until materials. permanent protection in the B. Dryvit assumes no responsibility form of flashings, sealants, etc. for on-site inspections or are installed. application of its products. B. The Dryvit Backstop NT - Texture shall not be exposed 3.05 CLEANING for longer than 30 days prior to A. All excess Dryvit materials shall being covered with the Exterior be removed from the job site by Insulation and Finish System. the Contractor in accordance with contract provisions. B. All surrounding areas, where Dryvit materials have been installed, shall be left free of debris and foreign substances resulting from the Contractor’s work.</p><p>DISCLAIMER Information contained in this specification conforms to standard detail and product recommendations for the installation of the Backstop NT - Texture product as of the date of publication of this document and is presented in good faith. Dryvit UK Ltd. assumes no liability, expressed or implied, as to the architecture, engineering or workmanship of any project. To ensure that you are using the latest, most complete information, contact:</p><p>Unit 4 Wren Park Hitchin Park Shefford, Bedfordshire SG17 5JD Telephone: 01462 819555</p><p>*The Trained Contractor Certificate indicates certain employees of the company have been instructed in the proper application of Dryvit products and have received copies of Dryvit’s Application Instructions and Specifications. The Trained Contractor Program is not an apprenticeship. Each trained contractor is an independent company experienced in the trade and bears responsibility for its own workmanship. Dryvit UK Ltd. assumes no liability for the workmanship of a trained contractor.</p><p>Dryvit UK Ltd. Unit 4 Wren Park Hitchin Park Shefford, Bedfordshire SG17 5JD 01462 819555 www.dryvit.co.uk</p>