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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C <br /> SECTION 04 01 20.64—BRICK MASONRY REPOINTING <br /> finished mortar surface below face of masonry to avoid widened joint faces. Take care not to spread mortar <br /> beyond joint edges onto exposed masonry surfaces or to featheredge the mortar. <br /> 4. When mortar is thumbprint hard, tool joints to match original appearance of joints as demonstrated in approved <br /> mockup. Remove excess mortar from edge of joint by brushing. <br /> 5. Cure mortar by maintaining in thoroughly damp condition for at least 72 consecutive hours, including weekends <br /> and holidays. <br /> 6. Hairline cracking within mortar or mortar separation at edge of a joint is unacceptable. Completely remove such <br /> mortar and repoint. <br /> F. Pointing with Sealant: Comply with Section 07 92 00"Joint Sealants."and as follows: <br /> 1. After raking out, keep joints dry and free of mortar and debris. <br /> 2. Clean and prepare joint surfaces.[Prime joint surfaces unless sealant manufacturer recommends against <br /> priming.] Do not allow primer to spill or migrate onto adjoining surfaces. <br /> 3. Fill sealant joints with specified joint sealant. <br /> a. Install cylindrical sealant backing beneath the sealant. Where space is insufficient for cylindrical sealant <br /> backing, install bond-breaker tape. <br /> b. Install sealant using only proven installation techniques that ensure that sealant is deposited in a uniform, <br /> continuous ribbon, without gaps or air pockets, and with complete wetting of the joint bond surfaces <br /> equally on both sides. Fill joint flush with surrounding masonry and matching the contour of adjoining <br /> mortar joints. <br /> c. Install sealant as recommended in writing by sealant manufacturer but within the following general <br /> limitations, measured at the center(thin)section of the bead: <br /> 1) Fill joints to a depth equal to joint width, but not more than 1/2 inch (13 mm)deep or less than 1/4 inch <br /> (6 mm)deep. <br /> d. Tool sealant to form smooth, uniform beads, slightly concave. Remove excess sealant from surfaces <br /> adjacent to joint. <br /> e. Sanded Joints: Immediately after first tooling, apply ground-mortar aggregate to sealant, gently pushing <br /> aggregate into the surface of sealant. Lightly retool sealant to form smooth, uniform beads, slightly <br /> concave. Remove excess sealant and aggregate from surfaces adjacent to joint. <br /> f. Do not allow sealant to overflow or spill onto adjoining surfaces, or to migrate into the voids of adjoining <br /> surfaces, particularly rough textures. Remove excess and spillage of sealant promptly as the work <br /> progresses. Clean adjoining surfaces by the means necessary to eliminate evidence of spillage, without <br /> damage to adjoining surfaces or finishes, as demonstrated in an approved mockup. <br /> G. Where repointing work precedes cleaning of existing masonry, allow mortar to harden at least 30 days before <br /> beginning cleaning work. <br /> 3.5 FINAL CLEANING <br /> A. After mortar has fully hardened, thoroughly clean exposed masonry surfaces of excess mortar and foreign matter; <br /> use wood scrapers, stiff-nylon or-fiber brushes, and clean water applied by low-pressure spray. <br /> 1. Do not use metal scrapers or brushes. <br /> 2. Do not use acidic or alkaline cleaners. <br /> B. Clean adjacent nonmasonry surfaces. Use detergent and soft brushes or cloths. <br /> C. Clean mortar and debris from roof; remove debris from gutters and downspouts. Rinse off roof and flush gutters and <br /> downspouts. <br /> D. Remove masking materials, leaving no residues that could trap dirt. <br /> 3.6 FIELD QUALITY CONTROL <br /> A. Testing Agency: Owner will engage qualified testing agency to perform tests and inspections. Allow inspectors use <br /> of lift devices and scaffolding, as needed,to perform inspections. <br /> B. Architect's Project Representatives: Architect will assign Project representatives to help carry out Architect's <br /> responsibilities at the site, including observing progress and quality of portion of the Work completed. Allow <br /> Architect's Project representatives use of lift devices and scaffolding, as needed, to observe progress and quality of <br /> portion of the Work completed. <br /> C. Notify [inspectors] [and] [Architect's Project representatives] in advance of times when lift devices and <br /> scaffolding will be relocated. Do not relocate lift devices and scaffolding until [inspectors] [and] [Architect's <br /> Project representatives] have had reasonable opportunity to make inspections and observations of work areas at <br /> lift device or scaffold location. <br /> END OF SECTION 04 0120.64 <br /> ©BOOMERANG DESIGN 04 01 20.64-5 510 Meadowlands Drive,Hillsborough, NC <br /> BD#1835 ORANGE COUNTY,NC 12/07/2018 <br />