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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C <br /> SECTION 04 01 20.63 —BRICK MASONRY REPAIR <br /> C. Masonry Cement:ASTM C91/C91M. <br /> 1. <Double click here to find evaluate, and insert list of manufacturers and products.> <br /> D. Mortar Cement:ASTM C 1 329/C 1 329M. <br /> 1. <Double click here to find, evaluate, and insert list of manufacturers and products.> <br /> E. Mortar Sand:ASTM C144. <br /> 1. Exposed Mortar: Match size, texture, and gradation of existing mortar sand as closely as possible. Blend <br /> several sands if necessary to achieve suitable match. <br /> 2. Colored Mortar: Natural sand or ground marble, granite, or other sound stone of color necessary to produce <br /> required mortar color. <br /> F. Mortar Pigments: ASTM C979/C979M, compounded for use in mortar mixes, and having a record of satisfactory <br /> performance in masonry mortars. <br /> 1. <Double click here to find, evaluate, and insert list of manufacturers and products.> <br /> G. Water: Potable. <br /> 2.4 MANUFACTURED REPAIR MATERIALS <br /> A. Brick Patching Compound: Factory-mixed cementitious product that is custom manufactured for patching brick <br /> masonry. <br /> 1. <Double click here to find, evaluate, and insert list of manufacturers and products.> <br /> 2. Use formulation that is vapor and water permeable (equal to or more than the brick), exhibits low shrinkage, <br /> has lower modulus of elasticity than bricks being repaired, and develops high bond strength to all types of <br /> masonry. <br /> 3. Use formulation having working qualities and retardation control to permit forming and sculpturing where <br /> necessary. <br /> 4. Formulate patching compound in colors and textures to match each brick being patched. Provide [sufficient <br /> number of] [no fewer than three] <Insert number> colors to enable matching of the color, texture, and <br /> variation of each unit. <br /> 2.5 ACCESSORY MATERIALS <br /> A. Setting Buttons and Shims: Resilient plastic, nonstaining to masonry, sized to suit joint thicknesses and bed depths <br /> of bricks, less the required depth of pointing materials unless removed before pointing. <br /> B. Masking Tape: Nonstaining, nonabsorbent material; compatible with mortar, joint primers, sealants, and surfaces <br /> adjacent to joints; and that easily comes off entirely, including adhesive. <br /> C. Antirust Coating: Fast-curing, lead- and chromate-free, self-curing, universal modified-alkyd primer according to <br /> [MPI#23 (surface-tolerant, anticorrosive metal primer)] [or] [SSPC-Paint 20 or SSPC-Paint 29 zinc-rich <br /> coating] <Insert requirement>. <br /> 1. Surface Preparation: Use coating requiring no better than [SSPC-SP 2, "Hand Tool Cleaning"] [SSPC-SP 3, <br /> "Power Tool Cleaning"] [or] [SSPC-SP 6/NACE No. 3, "Commercial Blast Cleaning"] <Insert surface <br /> preparation standard>surface preparation according to manufacturer's literature or certified statement. <br /> 2. VOC Limit: Use coating with a VOC content of[400 g/L(3.3 lb/gal.)] <Insert value>or less. <br /> D. Other Products: Select materials and methods of use based on the following, subject to approval of a mockup: <br /> 1. Previous effectiveness in performing the work involved. <br /> 2. Minimal possibility of damaging exposed surfaces. <br /> 3. Consistency of each application. <br /> 4. Uniformity of the resulting overall appearance. <br /> 5. Do not use products or tools that could leave residue on surfaces. <br /> 2.6 MORTAR MIXES <br /> A. Measurement and Mixing: Measure cementitious materials and sand in a dry condition by volume or equivalent <br /> weight. Do not measure by shovel; use known measure. Mix materials in a clean, mechanical batch mixer. <br /> B. Colored Mortar: Produce mortar of color required by using specified ingredients. Do not alter specified proportions <br /> without Architect's approval. <br /> 1. Mortar Pigments: Where mortar pigments are indicated, do not add pigment exceeding 10 percent by weight of <br /> the cementitious or binder materials, except for carbon black which is limited to 2 percent, unless otherwise <br /> demonstrated by a satisfactory history of performance. <br /> C. Do not use admixtures in mortar unless otherwise indicated. <br /> D. Mixes: Mix mortar materials in the following proportions: <br /> 1. Rebuilding (Setting) Mortar by Volume:ASTM C270, Proportion Specification, [1 part Portland cement, 1 part <br /> lime, and 6 parts sand] <Insert proportions>. <br /> ©BOOMERANG DESIGN 04 01 20.63-5 510 Meadowlands Drive,Hillsborough, NC <br /> BD#1835 ORANGE COUNTY,NC 12/07/2018 <br />