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Section 09200 – Page 1 of 8 LATH and PLASTER

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Section 09200 – Page 1 of 8 LATH and PLASTER Section 09200 – Page 1 of 8 LATH AND PLASTER SECTION 09200 - LATH AND PLASTER PART 1 – GENERAL 1.01 RELATED DOCUMENTS A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 0 and Division 1 Specification Sections, apply to work of this Section. 1.02 DESCRIPTION OF WORK A. Three Coat Stucco System for a plaster scratch, brown and acrylic finish coats over wood studs and accessories as shown on Drawings. 1.03 RELATED WORK A. Refer to Division 9 section for interior drywall. B. Refer to Division 6 section for wood framing. C. Refer to Division 7 section for joint sealers. 1.04 QUALITY ASSURANCE A. ATM C150 – Portland Cement B. ASTM C847 – Standard Specification for Metal Lath C. ASTM C1032 – Wowen Wire Plaster Base D. ASTM C933 – Welded Wire Lath E. ASTM C144/C897 – Aggregate for Job-Mixed Portland Cement-Based Plaster F. ASTM C926 – Application of Portland Cement-Based Plaster G. ASTM C1063 – Installation of Lathing and Furring for Portland Cement Based Plaster H. PCS (Portland Cement Association) – Plaster (Stucco) Manual I. Plaster and Drywall Systems Manual, Third Edition J. ICC_ES Acceptance Criteria for Water-resistive Barriers (AC38) K. Omega Three Coat System Detail (TCS) 1.05 QUALIFICATIONS A. Manufacturer: System component materials shall be manufactured or approved by Omega Products International, Inc. and shall be distributed by the same or its authorized dealers. B. Plastering Contractor: Shall specialize in cement plasterwork with documented experience. Shall provide proof of current contractor’s license and bond where required. 1.06 SUBMITTALS A. Product Data: Submit manufacturer's product data, installation instructions, and details for cementitious materials, lath and accessories. B. Samples: Color samples of finish coat of plastering. Retain approved samples at the construction site throughout the application process. Shafter-Wasco Irrigation District – Office - #01-267 Section 09200 – Page 2 of 8 LATH AND PLASTER C. Prior to commencement of work, provide a mock-up for approval. 1. Mock-up suitable to represent the products to be installed for each color and texture constructed using the same tools and techniques to be utilized on the project. 2. Retain approved mock-up at job site throughout the application process. 3. Where acceptable to the Architect, approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion. 4. One container of finish for each color and texture utilized on the project. 5. A maintenance program for finishes as required. 1.07 DELIVERY, STORAGE AND HANDLING A. Deliver materials in original, unopened packages, containers or bundles bearing brand name and identification of manufacturer. B. Store materials inside, off the ground, under cover at a temperature not less than 38° F. and in a manner to keep them dry, protected from weather, direct sunlight, surface contamination, aging, corrosion, and damage from construction traffic and other causes. Neatly stack gypsum lath flat to prevent deterioration. Damaged or deteriorated materials shall be removed. Installed elastomeric finish materials shall be protected from exposure to rain and freezing until dry. 1.08 PROJECT CONDITIONS A. Environmental Requirements, General: Comply with requirements of referenced plaster application standards and recommendations of plaster manufacturer for environmental conditions before, during and after application of plaster. B. Cold Weather Protection: For exterior synthetic wall finish or plaster, do not apply when prevailing outdoor temperature is below 40° F. If freezing is expected, do not apply synthetic wall finish or plaster beyond period of day necessary to allow hydration. C. Ventilation: Ventilation and air circulation during veneer plastering shall be kept to a minimum level until plaster has set and completely dried. Ventilate building spaces as required to remove water in excess of that required for hydration of plaster. Begin ventilation immediately after plaster is applied and continue until it dries. In enclosed areas lacking normal ventilation, provisions shall be made to mechanically remove moisture-laden air. D. Protect contiguous work from soiling, spattering, moisture deterioration and other harmful effects which might result from plastering. E. When low humidity, high temperatures and rapid drying conditions exist furring plaster base and plaster application, Durabond Joint Compound and Perf-A-Tape Reinforcement shall be used on all joints, internal corners, trim and corner beads and allowed to set and dry thoroughly before plaster application. F. Substrates: Prior to installation, inspect the wall for surface contamination or other defects that may adversely affect the performance of the materials, and shall be free of residual moisture. Do not apply Super Cement to substrates whose temperature are less than 40°F (4°C) or contain frost or ice. Shafter-Wasco Irrigation District – Office - #01-267 Section 09200 – Page 3 of 8 LATH AND PLASTER G. Inclement Weather: Protect applied material from inclement weather until dry. H. Sequencing: Coordinate the installation of the Super Cement System with all other construction trades. To reduce the likelihood of the stucco cracking, it is recommended the building carry a minimum of 90 percent of the dead building load and the interior gypsum be installed prior to installation of the stucco. I. Staffing: Provide sufficient manpower to ensure continuous operation, free of cold joints, scaffolding lines, variations in texture, etc. 1.09 WARRANTY A. Provide warranty for 5 years from date of Notice of Completion for defects or imperfections caused by workmanship which may develop within that 5 year period. PART 2 – PRODUCTS 2.01 Manufacturers: Subject to compliance with requirements, provide products of by the following manufacturer. The Architect as delineated in Division O Bid and Agreement Documents shall review other manufacturers. A. Manufacturers of Portland Cement Plasters: 1. Omega Products International, “Enhanced Three Coat System” 2. La Habra Stucco Co. B. Manufacturers of Expanded Metal Lath: 1. Bostwick Steel Framing Co. 2. Gold Bond Building Products Div., National Gypsum Co. 3. Milcor Division; Inryco, Inc. 4. United States Gypsum Co. 5. Western Metal Lath Co. C. Manufacturers of Accessories: 1. Amico - West 2. Flannery, Inc 3. Fry Reglet Corp. 4. Gold Bond Building Products Div., National Gypsum Co. 5. Milcor Division; Inryco, Inc. 6. United States Gypsum Co. 7. Western Metal Lath Co. 8. Superior Company 2.02 SCRATCH AND BROWN COAT A. Super Cement, Non-fibered: A mixture of portland cement complying with ASTM C150 that has an additional mixture of proprietary ingredients manufactured by Omega Products International, Inc. Shafter-Wasco Irrigation District – Office - #01-267 Section 09200 – Page 4 of 8 LATH AND PLASTER B. Sand: Sand must be clean and free from deleterious amounts of loam, clay, silt, soluble salts and organic matter. Sampling and testing must comply with ASTM C144 or C897. C. Water: Clean and potable without foreign matter. 2.03 WATER-RESISTIVE BARRIER A. Over Open Framing : 1. Two layers of D kraft building paper, or 2. One layer of asphalt-saturated felt complying with ASTM D226 Type 2.04 LATH A. Expanded Lath: Nominal (2.5 lb/yd2, [3.4 lb/yd2 weight), galvanized steel complying with ASTM C847.] B. Rib Lath: Nominal (3.4 lb/yd2 weight), galvanized steel complying with ASTM C847 at Soffits. 2.05 SHEATHING A. Densglas “Gold, 5/8” thick panel, complying with ASTM C208 as a regular density sheathing. 2.06 ACCESSORIES A. Caulking: Acrylic latex complying with ASTM C834 or silyl-terminated polyether elastomeric sealant complying with ASTM C920. B. Vapor Retarder: A vapor retarder complying with the International Energy Conservation Code (IECC) Section 402.5 or 502.5 or IRC Section R318.1 must be provided. C. Flashing: Flashing complying with UBC Section 1404.2, IBC Section 1405.3 or IRC Section R703.8, as applicable, must be provided. D. Fasteners: Nails, staples, or screws used to rigidly secure lath and associated accessories shall be corrosion-resistant and meet the minimum requirements of ASTM C1063. E. Zinc and Zinc-Coated (Galvanized) Accessories: The following accessories shall be fabricated from zinc-coated (galvanized) steel. 1. Corner Aid: Minimum 26-gauge thick; expanded flanges shaped to permit complete embedding in plaster; minimum 2 in. wide; Square-edge style; use unless otherwise indicated. 2. Strip Mesh: Metal Lath, 3.4 lb/yd2 expanded metal; 6 in. wide x 18 in. long. 3. Vent Screed: Minimum 24-gauge thick; thickness governed by plaster thickness; minimum 4-inch (102 mm) width, double “V” profile, with perforated expanse between “V’s” of longest possible lengths. 4. Casing Bead: Minimum 24-gauge thick; thickness governed by plaster thickness; maximum possible lengths; expanded metal flanges, with square edges. Shafter-Wasco Irrigation District – Office - #01-267 Section 09200 – Page 5 of 8 LATH AND PLASTER 5. Drip Screed: Minimum 26-gauge thick, depth governed by plaster thickness, minimum 3-1/2 in. high flange, maximum possible lengths. 6. Control and Expansion Joints: Depth to conform to plaster thickness; use maximum practical lengths. a. Control Joints: One-piece-type, folded pair of unperforated screeds in double V configuration; removable protective tape on plaster face of control joint. b. Expansion Joints: Two-piece-type formed to produce a slip-joint. F. Plastic Trim: Fabricated from high-impact PVC. 1. Cornerbeads: With perforated flanges. Square-edge style; use unless otherwise indicated. 2. Casing Beads: With perforated flanges in depth required to suit plaster bases indicated and flange length required to suit applications indicated. Square-edge style; use unless otherwise indicated. 3. Control Joints: One-piece-type, folded pair of unperforated screeds in double V configuration; removable protective tape on plaster face of control joint. 4. Expansion Joints: Two-piece-type formed to produce a slip-joint. 2.07 FOAM ARCHITECTURAL DETAILS A. Foam: EPS foam, 1.0 lb/ft2 minimum density. 2.08 FINSIHES A. OmegaFlex: 100% acrylic-based finish manufactured by Omega Products International, Inc.
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