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Paris Santa Fe-Frisco Depot Rehabilitation O KEYSTONE ARCHITECTS <br /> July 10, 2001 <br /> <br />3.05 APPLICATION <br /> <br /> A. General: Apply plaster as required to replicate in-kind existing plaster or to patch <br /> and match existing plaster as specified herein and as shown on Drawings. Use <br /> applicators and techniques best suited for substrate and type of material being <br /> applied, as indicated herein and on Drawings. <br /> <br /> B. Scheduling: Do not commence plaster application until Field Samples, <br /> substrate preparation, and identified areas to be patched and matched have been <br /> approved by Construction Manager. <br /> <br /> C. Patching & Matching: Patching and matching of existing plaster finishes will be <br /> carried out as follows: <br /> <br /> 1. Hairline Surface Cracks: Fill with "high gauge" lime putty, comprised of <br /> 50% lime + 50% gauging plaster or drywall joint compound. Fill and <br /> feather. Sand smooth. <br /> <br /> 2. Small Open Surface Cracks: Widen crack slightly with crack widener. <br /> Fill partially with drywall joint compound. Bridge gap with fiberglass <br /> mesh tape pressed into the patching compound. After compound is dry, <br /> cover tape with second coat of drywall compound, feathering at edges. <br /> After drying, apply third coat to even out surface, followed by light <br /> sanding. After dry remove plaster residue with damp sponge. <br /> <br /> 3. Large Cracks: Confirm completion of structural repairs prior to <br /> commencing work. Remove plaster on each side of crack to yield a total <br /> width of 6 inches down to the lath. Feather edges to expose all three <br /> existing layers of plaster system. Clean out debris, attach metal lath to <br /> existing wood lath with wire ties. Proceed to patch with three coat plaster <br /> system as specified. <br /> <br /> 4. Delaminated Finish Coat: Where finish coat of plaster has separated from <br /> base coat, coat affected area with liquid plaster bonding agent. Patch with <br /> finish coat and sand smooth. <br /> <br /> Section 09910 <br /> <br /> Page 5-7 <br /> <br /> <br />