Section 09220 - Portland Cement Plaster
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[SUBMITTAL INFORMATION]
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SECTION 09 24 23
PORTLAND CEMENT PLASTER (Edited from DeCA June 2017 Design Criteria)
PART 1 - GENERAL
0.1 SUMMARY
A. Section Includes:
1. Exterior soffit portland cement plasterwork on metal lath plaster bases.
B. Related Sections:
1. Division 01 Section Sustainable Design Reporting for recycled content of steel products. 2. Division 05 Section Cold-Formed Metal Framing for metal framing that support furring, lath, and portland cement plaster.
0.2 SUBMITTALS
A. Product Data:
1. For each type of product indicated.
B. LEED Submittals:
1. Product Data for Credit MR 4: For products having recycled content, documentation indicating percentages by weight of postconsumer and preconsumer recycled content.
a. Include statement indicating costs for each product having recycled content.
2. Product Data for Credit EQ 4: For sealants, including printed statement of VOC content.
C. Shop Drawings:
1. Show locations and installation of control and expansion joints including plans, elevations, sections, details of components, and attachments to other work.
D. Samples for Verification:
1. For each type of finish coat indicated; 12 by 12 inches, and prepared on rigid backing.
E. Submittal List:
Reference Submittal Item Quantity Action 1.2A Product Data X R 1.2B LEED Submittals X I 1.2C Shop Drawings X R 1.2D Samples for Verification X R
X Submit quantity specified in Division 01 Section Administrative Requirements. R Review each submittal, mark to indicate action taken, and return. I Submittal is for information or record purposes only. No action will be taken.
0.3 DELIVERY, STORAGE, AND HANDLING
A. Store materials inside under cover and keep them dry and protected against damage from weather, direct sunlight, surface contamination, corrosion, construction traffic, and other causes.
0.4 PROJECT CONDITIONS
A. Reference Standard:
1. Comply with ASTM C 926 requirements.
B. Exterior Soffit Plasterwork:
1. Apply and cure plaster to prevent plaster drying out during curing period. Use procedures required by climatic conditions, including moist curing, providing coverings, and providing barriers to deflect sunlight and wind. 2. Apply plaster when ambient temperature is greater than 40 deg F. 3. Protect plaster coats from freezing for not less than 48 hours after set of plaster coat has occurred.
PART 2 - PRODUCTS
0.1 MANUFACTURERS
A. Basis-of-Design Products: To establish the significant qualities related to type, function, dimension, in-service performance, physical properties, appearance, and other characteristics for purposes of evaluating comparable products of other manufacturers, a specific manufacturer's product is named and accompanied by the words "basis of design," including make or model number or other designation. Subject to compliance with requirements, provide either the named products or equal products.
0.2 STEEL SOFFIT MEMBERS, GENERAL
A. Components, General:
1. Comply with ASTM C 1063. For steel sheet components not included in ASTM C 1063, comply with ASTM C 645 requirements for metal, unless otherwise indicated.
B. Cold-Rolled Channels:
1. Base metal thickness of 0.0538 inch with ASTM A 653/A 653M, G60, hot-dip galvanized zinc coating.
C. Wire:
1. ASTM A 641/A 641M, Class 1 zinc coating, soft temper, not less than 0.0475-inch diameter, unless otherwise indicated.
0.3 STEEL FURRING FOR SOFFITS
A. Direct Furring:
1. Cold-rolled channels, 3/4 inch deep.
B. Tie Wire:
1. For saddle tying cross furring to main runners use 0.0625-inch- diameter wire or double strand of 0.0475-inch- diameter wire.
0.4 METAL LATH
A. Expanded-Metal Lath:
1. ASTM C 847 with ASTM A 653/A 653M, G60, hot-dip galvanized zinc coating. 2. 3/8-Inch Rib Lath. 3. Weight: 4 lb/sq. yd.
0.5 ACCESSORIES
A. General:
1. Comply with ASTM C 1063 and coordinate depth of trim and accessories with thicknesses and number of plaster coats required.
B. Zinc Accessories:
1. Casing Beads: Fabricated from zinc; square-edged style; with expanded flanges. 2. Control Joints: Fabricated from zinc; one-piece-type, folded pair of unperforated screeds in M-shaped configuration; with perforated flanges and removable protective tape on plaster face of control joint.
C. Aluminum Accessories:
1. Basis-of-Design Products: Fry Reglet Corporation. 2. Extruded aluminum alloy 6063 T5 with clear anodized finish. 3. Vented Soffit Molding: Product number WPM-75-V-300; 3/4 inch deep, 3-inch reveal width. 4. Soffit Vent: Product number PCS-75-V-300; 3/4 inch deep, 3-inch reveal width. 5. "F" Reveal Molding, Non-Vented: Product number FPM-75-100; 3/4 inch deep, 1-inch reveal width.
0.6 MISCELLANEOUS MATERIALS
A. Water for Mixing:
1. Potable and free of substances capable of affecting plaster set or of damaging plaster, lath, or accessories.
B. Steel Drill Screws:
1. For metal-to-metal fastening, ASTM C 1002 or ASTM C 954, as required by thickness of metal being fastened; with pan head that is suitable for application; in lengths required to achieve penetration through joined materials of not fewer than three exposed threads.
a. Fasteners for Attaching Metal Lath to Substrates: Complying with ASTM C 1063.
0.7 PLASTER MATERIALS
A. Portland Cement: ASTM C 150, Type I.
1. Color for Finish Coats: White.
B. Lime: ASTM C 206, Type S; or ASTM C 207, Type S.
C. Sand Aggregate: ASTM C 897.
0.8 PLASTER MIXES
A. General:
1. Comply with ASTM C 926 for applications indicated.
B. Base-Coat Mixes for Use over Metal Lath:
1. Scratch and brown coats for three-coat plasterwork as follows:
a. Portland Cement Mixes:
1) Scratch Coat: For cementitious material, mix 1 part portland cement and 0 to 3/4 parts lime. Use 2-1/2 to 4 parts aggregate per part of cementitious material (sum of separate volumes of each component material). 2) Brown Coat: For cementitious material, mix 1 part portland cement and 0 to 3/4 parts lime. Use 3 to 5 parts aggregate per part of cementitious material (sum of separate volumes of each component material).
C. Job-Mixed Finish-Coat Mixes:
1. Portland Cement Mix: For cementitious materials, mix 1 part portland cement and 3/4 to 1-1/2 parts lime. Use 1-1/2 to 3 parts aggregate per part of cementitious material (sum of separate volumes of each component material).
PART 3 - EXECUTION
0.1 EXAMINATION
A. Examine areas and substrates, with Installer present, including structural framing, for compliance with requirements and other conditions affecting performance. Proceed with installation only after unsatisfactory conditions have been corrected.
0.2 PREPARATION
A. Protect adjacent work from soiling, spattering, moisture deterioration, and other harmful effects caused by plastering.
0.3 INSTALLING STEEL SOFFIT MEMBERS, GENERAL
A. General:
1. Comply with requirements in ASTM C 1063 for applications indicated.
a. Comply with ASTM C 754 for installation of items not addressed in ASTM C 1063.
2. Install supplementary framing, blocking, and bracing at terminations in plaster assemblies to support fixtures, equipment services, or similar construction.
a. Isolate soffit assemblies where they abut or are penetrated by building structure.
3. Do not bridge building control joints with furring members. Frame both sides of joints independently.
0.4 INSTALLING STEEL FURRING FOR SOFFITS
A. Installation Tolerances:
1. Install steel furring components for soffits so members are level to within 1/4 inch in 10 feet measured lengthwise on each member and transversely between parallel members. 2. Install steel furring components for soffits in sizes and spacings indicated but not less than that required by the referenced steel framing and installation standards.
B. Furring Spacing:
1. For suspended soffits, 12 inches o.c.
0.5 INSTALLING METAL LATH
A. Expanded-Metal Lath:
1. Install according to ASTM C 1063.
a. Flat-Soffit: Install 3/8-inch rib lath lath.
0.6 INSTALLING ACCESSORIES
A. General:
1. Install according to ASTM C 1063 and at locations indicated on Drawings.
B. Control Joints and Other Accessories:
1. Install control joints and other accessories at locations indicated on Drawings.
0.7 PLASTER APPLICATION
A. General:
1. Comply with ASTM C 926 except nominal thickness of plaster shall be 3/4-inch.
a. Do not deviate more than plus or minus 1/4 inch in 10 feet from a true plane in finished plaster surfaces, as measured by a 10-foot straightedge placed on surface. b. Finish plaster flush with metal frames and other built-in metal items or accessories that act as a plaster ground, unless otherwise indicated. Where casing bead does not terminate plaster at metal frame, cut base coat free from metal frame before plaster sets and groove finish coat at junctures with metal.
c. Provide plaster surfaces that are ready to receive field-applied finishes indicated.
B. Soffits; Base-Coat Mixes for Use over Metal Lath:
1. Scratch and brown coats for three-coat plasterwork; 1/2 inch thick.
a. Portland cement mixes.
C. Plaster Finish Coats:
1. Apply to provide float finish to match approved sample.
0.8 CUTTING AND PATCHING
A. Cut, patch, replace, and repair plaster as necessary to accommodate other work and to restore cracks, dents, and imperfections. Repair or replace work to eliminate blisters, buckles, crazing and check cracking, dry outs, efflorescence, sweat outs, and similar defects and where bond to substrate has failed.
0.9 CLEANING AND PROTECTION
A. Remove temporary protection and enclosure of other work. Promptly remove plaster from other surfaces not indicated to be plastered. Repair floors, walls, and other surfaces stained, marred, or otherwise damaged during plastering.
END OF SECTION