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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C <br /> SECTION 04 01 20.63 —BRICK MASONRY REPAIR <br /> B. Temperature Limits: Repair brick masonry only when air temperature is between 40 and 90 deg F (4 and 32 deg C) <br /> and is predicted to remain so for at least seven days after completion of the Work unless otherwise indicated. <br /> C. Cold-Weather Requirements: Comply with the following procedures for masonry repair unless otherwise indicated: <br /> 1. When air temperature is below 40 deg F (4 deg C), heat mortar ingredients, masonry repair materials, and <br /> existing masonry walls to produce temperatures between 40 and 120 deg F (4 and 49 deg C). <br /> 2. When mean daily air temperature is below 40 deg F (4 deg C), provide enclosure and heat to maintain <br /> temperatures above 32 deg F(0 deg C)within the enclosure for seven days after repair. <br /> D. Hot-Weather Requirements: Protect masonry repairs when temperature and humidity conditions produce excessive <br /> evaporation of water from mortar and repair materials. Provide artificial shade and wind breaks, and use cooled <br /> materials as required to minimize evaporation. Do not apply mortar to substrates with temperatures of 90 deg F (32 <br /> deg C)and above unless otherwise indicated. <br /> E. For manufactured repair materials, perform work within the environmental limits set by each manufacturer. <br /> PART 2-PRODUCTS <br /> 2.1 PERFORMANCE REQUIREMENTS <br /> A. Source Limitations: Obtain each type of material for repairing brick masonry (brick, cement, sand, etc.)from single <br /> source with resources to provide materials of consistent quality in appearance and physical properties. <br /> 2.2 MASONRY MATERIALS <br /> A. Face Brick:As required to complete brick masonry repair work. <br /> 1. Brick Matching Existing: Units with colors, color variation within units, surface texture, size, and shape that <br /> match existing brickwork and with physical properties [within 10 percent of those determined from <br /> preconstruction testing of selected existing units.] [as listed below:] <br /> a. Physical Properties:According to ASTM C67 and as follows: <br /> 1) Compressive Strength: <Insert requirement>. <br /> 2) 24-Hour Cold-Water Submersion Absorption: <Insert requirement>. <br /> 3) Five-Hour Boil Absorption: <Insert requirement>. <br /> 4) Saturation Coefficient: <Insert requirement>. <br /> 5) Initial Rate of Absorption: <Insert requirement>. <br /> b. For existing brickwork that exhibits a range of colors or color variation within units, provide brick that <br /> proportionally matches that range and variation rather than brick that matches an individual color within <br /> that range. <br /> 2. Brick Matching Architect's Sample: Units with colors, color variation within units, surface texture, and physical <br /> properties that match Architect's sample. Match existing units in size and shape. <br /> a. Physical Properties:According to ASTM C67 and as follows: <br /> 1) Compressive Strength: <Insert requirement>. <br /> 2) 24-Hour Cold-Water Submersion Absorption: <Insert requirement>. <br /> 3) Five-Hour Boil Absorption: <Insert requirement>. <br /> 4) Saturation Coefficient: <Insert requirement>. <br /> 5) Initial Rate of Absorption: <Insert requirement>. <br /> b. For Architect's sample that exhibits a range of colors or color variation within units, provide brick that <br /> proportionally matches that range rather than brick that matches an individual color within that range. <br /> 3. Special Shapes: <br /> a. Provide molded, 100 percent solid shapes for applications where core holes or"frogs"could be exposed to <br /> view or weather when in final position and where shapes produced by sawing would result in sawed <br /> surfaces being exposed to view. <br /> b. Provide specially ground units, shaped to match patterns,for arches and where indicated. <br /> c. Mechanical chopping or breaking brick, or bonding pieces of brick together by adhesive, are unacceptable <br /> procedures for fabricating special shapes. <br /> 4. Tolerances as Fabricated: [According to tolerance requirements in ASTM C216, Type FBX] [According to <br /> tolerance requirements in ASTM C216,Type FBS]<Insert requirement>. <br /> B. Building Brick:ASTM C62, of same vertical dimension as face brick,for masonry work concealed from view. <br /> 1. Grade SW where in contact with earth. <br /> 2. [Grade SW or MW] [Grade SW, MW, or NW]for concealed backup. <br /> 2.3 MORTAR MATERIALS <br /> A. Portland Cement: ASTM C150/C150M, Type I or Type 11, 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 /> ©BOOMERANG DESIGN 04 01 20.63-4 510 Meadowlands Drive,Hillsborough, NC <br /> BD#1835 ORANGE COUNTY,NC 12/07/2018 <br />