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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C <br /> SECTION 04 01 20.64—BRICK MASONRY REPOINTING <br /> 2.2 MORTAR MATERIALS <br /> A. Portland Cement: ASTM C150/C150M, Type I or Type II, except Type III may be used for cold-weather <br /> construction;white[or gray,or both]where required for color matching of mortar. <br /> 1. Provide cement containing not more than 0.60 percent total alkali when tested according to ASTM C114. <br /> B. Hydrated Lime:ASTM C207,Type S. <br /> C. Masonry Cement:ASTM C91/C91 M. <br /> 1. xxx <br /> D. Mortar Cement:ASTM C 1 329/C 1 329M. <br /> 1. xxx <br /> E. Mortar Sand:ASTM C144. <br /> 1. Match size, texture, and gradation of existing mortar sand as closely as possible. Blend several sands if <br /> necessary to achieve suitable match. <br /> 2. Color: Natural sand or ground marble, granite, or other sound stone of color necessary to produce required <br /> mortar color. <br /> F. Water: Potable. <br /> 2.3 ACCESSORY MATERIALS <br /> A. Sealant Materials: <br /> 1. Sealant manufacturer's standard elastomeric sealant(s) of base polymer and characteristics indicated below <br /> and according to applicable requirements in Section 07 92 00"Joint Sealants." <br /> a. Type: [Single-component, nonsag urethane sealant] <Insert type>. <br /> 2. Colors: Provide colors of exposed sealants to match colors of mortar adjoining installed sealant unless <br /> otherwise indicated. <br /> 3. Ground-Mortar Aggregate: Custom crushed and ground pointing mortar sand or existing mortar retrieved from <br /> joints. Grind to a particle size that matches the adjacent mortar aggregate and color. Remove all fines passing <br /> the [No. 100] <Insert number>sieve. <br /> B. Joint-Sealant Backing: <br /> 1. Cylindrical Sealant Backings: ASTM C1330, [Type C (closed-cell material with a surface skin)] [or] [Type B <br /> (bicellular material with a surface skin)], and of size and density to control sealant depth and otherwise <br /> contribute to producing optimum sealant performance. <br /> 2. Bond-Breaker Tape: Polyethylene tape or other plastic tape recommended in writing by sealant manufacturer <br /> for preventing sealant from adhering to rigid, inflexible, joint-filler materials or joint surfaces at back of joint <br /> where such adhesion would result in sealant failure. Provide self-adhesive tape where applicable. <br /> C. 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 /> 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 /> 2.4 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 /> 1. Mixing Pointing Mortar: Thoroughly mix cementitious materials and sand together before adding any water. <br /> Then mix again, adding only enough water to produce a damp, unworkable mix that retains its form when <br /> pressed into a ball. Maintain mortar in this dampened condition for 15 to 30 minutes. Add remaining water in <br /> small portions until mortar reaches desired consistency. Use mortar within one hour of final mixing; do not <br /> retemper or use partially hardened material. <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. Pointing Mortar by Volume: ASTM C270, Proportion Specification, [1 part portland cement, 1 part lime, and <br /> 6 parts sand]<Insert proportions>.[Add mortar pigments to produce mortar colors required.] <br /> ©BOOMERANG DESIGN 04 01 20.64-3 510 Meadowlands Drive,Hillsborough, NC <br /> BD#1835 ORANGE COUNTY,NC 12/07/2018 <br />