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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C <br /> SECTION 04 01 20.63 —BRICK MASONRY REPAIR <br /> H. Install replacement brick into bonding and coursing pattern of existing brick. If cutting is required, use a motor- <br /> driven saw designed to cut masonry with clean, sharp, unchipped edges. <br /> 1. Maintain joint width for replacement units to match existing joints. <br /> 2. Use setting buttons or shims to set units accurately spaced with uniform joints. <br /> I. Lay replacement brick with rebuilding (setting) mortar and with completely filled bed, head, and collar joints. Butter <br /> ends with enough mortar to fill head joints and shove into place. Wet both replacement and surrounding bricks that <br /> have ASTM C67 initial rates of absorption (suction)of more than 30 g/30 sq. in. per min. (30 g/194 sq. cm per min.) <br /> Use wetting methods that ensure that units are nearly saturated but surface is dry when laid. <br /> 1. Tool exposed mortar joints in repaired areas to match joints of surrounding existing brickwork. <br /> 2. Rake out mortar used for laying brick before mortar sets according to Section 04 01 20.64 "Brick Masonry <br /> Repointing." Point at same time as repointing of surrounding area. <br /> 3. When mortar is hard enough to support units, remove shims and other devices interfering with pointing of <br /> joints. <br /> J. Curing: Cure mortar by maintaining in thoroughly damp condition for at least 72 consecutive hours, including <br /> weekends and holidays. <br /> 1. Hairline cracking within the mortar or mortar separation at edge of a joint is unacceptable. Completely remove <br /> such mortar and repoint. <br /> 3.6 PAINTING STEEL UNCOVERED DURING THE WORK<Insert drawing designation> <br /> A. Notify Architect if steel is exposed during masonry removal. Where Architect determines that steel is structural, or <br /> for other reasons cannot be totally removed, prepare and paint it as follows: <br /> 1. Surface Preparation: Remove paint, rust, and other contaminants according to [SSPC-SP 2, "Hand Tool <br /> Cleaning"] [SSPC-SP 3, "Power Tool Cleaning"] [or] [SSPC-SP 6/NACE No. 3, "Commercial Blast <br /> Cleaning"] <Insert surface preparation standard>, as applicable to comply with paint manufacturer's <br /> recommended preparation. <br /> 2. Antirust Coating: Immediately paint exposed steel with two coats of antirust coating, following coating <br /> manufacturer's written instructions and without exceeding manufacturer's recommended rate of application (dry <br /> film thickness per coat). <br /> B. If on inspection and rust removal, the thickness of a steel member is found to be reduced from rust by more than <br /> [1/16 inch (1.6 mm)] <Insert dimension>, notify Architect before proceeding. <br /> 3.7 BRICK MASONRY PATCHING <Insert drawing designation> <br /> A. Patch the following bricks unless another type of repair or replacement is indicated: <br /> 1. Bricks indicated to be patched. <br /> 2. Bricks with holes. <br /> 3. Bricks with chipped edges or corners.[Patch chipped edges or corners measuring more than 3/4 inch (19 <br /> mm) in least dimension.] <br /> 4. Bricks with small areas of deep deterioration.[Patch deep deteriorations measuring more than 3/4 inch (19 <br /> mm) in least dimension and more than 1/4 inch (6 mm)deep.] <br /> B. Remove and replace existing patches [where indicated] [unless otherwise indicated or approved by Architect]. <br /> C. Patching Bricks: <br /> 1. Remove loose material from masonry surface. Carefully remove additional material so patch does not have <br /> feathered edges but has square or slightly undercut edges on area to be patched and is at least [1/4 inch (6 <br /> mm)] <Insert dimension> thick, but not less than recommended in writing by patching compound <br /> manufacturer. <br /> 2. Mask adjacent mortar joint or rake out for repointing if patch extends to edge of brick. <br /> 3. Mix patching compound in individual batches to match each unit being patched. Combine one or more colors of <br /> patching compound, as needed,to produce exact match. <br /> 4. Rinse surface to be patched and leave damp, but without standing water. <br /> 5. Brush-coat surfaces with slurry coat of patching compound according to manufacturer's written instructions. <br /> 6. Place patching compound in layers as recommended in writing by patching compound manufacturer, but not <br /> less than 1/4 inch (6 mm)or more than 2 inches (50 mm)thick. Roughen surface of each layer to provide a key <br /> for next layer. <br /> 7. Trowel, scrape, or carve surface of patch to match texture and surrounding surface plane or contour of brick. <br /> Shape and finish surface before or after curing, as determined by testing, to best match existing brick. <br /> 8. Keep each layer damp for 72 hours or until patching compound has set. <br /> 9. Remove and replace patches with hairline cracks or that show separation from brick at edges, and those that <br /> do not match adjoining brick in color or texture. <br /> ©BOOMERANG DESIGN 04 01 20.63-7 510 Meadowlands Drive,Hillsborough, NC <br /> BD#1835 ORANGE COUNTY,NC 12/07/2018 <br />