SECTION 09 2400 PORTLAND CEMENT PLASTERING (STUCCO) PART 1 GENERAL 1.01 SECTION INCLUDES A. Portland cement plaster for installation over metal lath and solid surfaces. 1.02 RELATED REQUIREMENTS A. Section 06 1000 – Rough Carpentry: Wood stud framing for stucco. 1.03 REFERENCE STANDARDS A. ASTM C 91, Masonry Cement B. ASTM C 150, Portland Cement C. ASTM C 206, Finishing Hydrated Lime D. ASTM A 897, Aggregate for Job-Mixed Portland Cement-Based Plaster E. ASTM C 926, Application of Portland Cement-Based Plaster 1.02 SUBMITTALS A. See Section 01 3000 - Administrative Requirements, for submittal procedures. B. Product Data: Manufacturer's printed literature describing packaged plaster and finish mixes, including finish coat color samples. C. In-Place-Samples: Prepare samples minimum 2 feet x 2 feet of each finish for Architect's approval before proceeding; use approved sample as reference for installed Work. 1.03 QUALITY ASSURANCE A. Tolerances: 1/8-inch maximum variation in any 8 feet for flatness, non-cumulative.
PART 2 PRODUCTS 2.01 PLASTER MATERIALS A. Cement: ASTM C 150, Portland cement. B. Masonry Cement: ASTM C 91, general use. C. Lime: ASTM C 206, Type S. D. Aggregate: ASTM C 897, well graded plaster sand. E. Finish Sand: Ottawa (silica) sand, white, with all material passing No. 8 sieve. F.
Fiber: AR (alkalai resistant) spun glass short fibers, maximum 1/2 inch long.
G. Premixed Finish: Oriental by United States Gypsum is specified; Thoroseal by Standard Dry Wall is acceptable, or approved equal; color to be selected by Architect from manufacturer's 15 standard colors. Project 1311 / Woodhaven Village Campus
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H. Water: Potable. 2.02 MIX PROPORTIONS ASTM C 925 (BY VOLUME) A. Scratch Coat: 1. 1 sack cement 2. 2 sacks masonry cement 3. 9 cubic feet aggregate 4. 1-1/2 pounds of fiber B. Brown Coat: 1. 1 sack cement 2. 2 sacks masonry cement 3. 10 cubic feet aggregate 4. 1-1/2 pounds of fiber C. Finish Coat: Premixed in accordance with manufacturer's instructions. PART 3 EXECUTION 3.01 MIXING A. Mechanically mix plaster materials at site without using frozen, caked or lumpy materials. B. Mix each batch separately; clean equipment between batches. C. Dispose of liquids containing plaster materials without going through building drains. 3.02 APPLICATION A. Apply each coat uniform in texture, free from jointing lines, waves, cat-faces, other blemishes; each coat shall be no less than a full panel. B. Scratch Coat: Apply to full 3/8 inch thickness; embed material firmly into lath; cross-scratch surface. C. Brown Coat: Apply to full 3/8 inch thickness; rod level and leave rough. D. Keep each coat moist with fog spray prior to succeeding coat application. E. Finish Coat: Sand float texture and uniform color to match approved sample; keep moist with fog spray minimum 48 hours after installation. F.
Skim Coat: Apply, not less than a thickness of 1/4a inch, to flat and level uniform sand float texture, ready for painting.
3.03 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.
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3.03 CLEANING AND PROTECTION A. Remove temporary protection and enclosure of other work. Promptly remove plaster from door frames, windows and other surfaces not indicated to be plastered. Repair floors, walls and other surfaces stained, marred or otherwise damaged during plastering. END OF SECTION
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