VA FED H-08-1 SEC 07920-2004 SEALANTS AND CAULKING《密封剂和填隙》.pdf
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1、04-04M 07920-1 SECTION 07920 SEALANTS AND CAULKING SPEC WRITER NOTE: Delete between /_/ if not applicable to project. Coordination with drawings: 1. Use term “sealants“ for all joints scheduled to receive sealants under PART 3. 2. Use term “caulking“ for all joints scheduled to receive caulking unde
2、r PART 3. 3. Do not use terms synonymously. General Design Criteria: 1. Use sealants in joints where movement over 8 percent is expected. 2. Use caulking on interior joints where no movement over 8 percent occurs, no water is expected, and no fire rating is required. 3. See SEALANTS: The Professiona
3、ls Guide (Sealant, Waterproofing are compatible with joint substrates, sealants, primers, and other joint fillers; and are approved for applications indicated by sealant manufacturer based on field experience and laboratory testing. B. Cylindrical Sealant Backings: ASTM C1330, of type indicated belo
4、w and of size and density to control sealant depth and otherwise contribute to producing optimum sealant performance: 1. Type C: Closed-cell material with a surface skin. C. Elastomeric Tubing Sealant Backings: Neoprene, butyl, EPDM, or silicone tubing complying with ASTM D1056, nonabsorbent to wate
5、r and gas, and capable of remaining resilient at temperatures down to minus 32 C (minus 26 F). Provide products with low compression set and of size and shape to provide a secondary seal, to control sealant depth, and otherwise contribute to optimum sealant performance. D. Bond-Breaker Tape: Polyeth
6、ylene tape or other plastic tape recommended by sealant manufacturer for preventing sealant from adhering to rigid, inflexible joint-filler materials or joint surfaces at back of joint where such adhesion would result in sealant failure. Provide self-adhesive tape where applicable. 2.5 FILLER: A. Mi
7、neral fiber board: ASTM C612, Class 1. B. Thickness same as joint width. C. Depth to fill void completely behind back-up rod. 2.6 PRIMER: A. As recommended by manufacturer of caulking or sealant material. B. Stain free type. 2.7 CLEANERS-NON POUROUS SURFACES: A. Chemical cleaners acceptable to manuf
8、acturer of sealants and sealant backing material, free of oily residues and other substances capable of Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-04M 07920-8 staining or harming joint substrates and adjacent non-pourous surfaces and formulat
9、ed to promote adhesion of sealant and substrates. PART 3 - EXECUTION 3.1 INSPECTION: A. Inspect substrate surface for bond breaker contamination and unsound materials at adherent faces of sealant. B. Coordinate for repair and resolution of unsound substrate materials. C. Inspect for uniform joint wi
10、dths and that dimensions are within tolerance established by sealant manufacturer. 3.2 PREPARATIONS: A. Prepare joints in accordance with manufacturers instructions and SWRI. B. Clean surfaces of joint to receive caulking or sealants leaving joint dry to the touch, free from frost, moisture, grease,
11、 oil, wax, lacquer paint, or other foreign matter that would tend to destroy or impair adhesion. 1. Clean porous joint substrate surfaces by brushing, grinding, blast cleaning, mechanical abrading, or a combination of these methods to produce a clean, sound substrate capable of developing optimum bo
12、nd with joint sealants. 2. Remove loose particles remaining from above cleaning operations by vacuuming or blowing out joints with oil-free compressed air. Porous joint surfaces include the following: a. Concrete. b. Masonry. c. Unglazed surfaces of ceramic tile. 3. Remove laitance and form-release
13、agents from concrete. 4. Clean nonporous surfaces with chemical cleaners or other means that do not stain, harm substrates, or leave residues capable of interfering with adhesion of joint sealants. a. Metal. b. Glass. c. Porcelain enamel. d. Glazed surfaces of ceramic tile. C. Do not cut or damage j
14、oint edges. D. Apply masking tape to face of surfaces adjacent to joints before applying primers, caulking, or sealing compounds. 1. Do not leave gaps between ends of sealant backings. 2. Do not stretch, twist, puncture, or tear sealant backings. 3. Remove absorbent sealant backings that have become
15、 wet before sealant application and replace them with dry materials. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-04-04M 07920-9 E. Apply primer to sides of joints wherever required by compound manufacturers printer instructions. 1. Apply primer p
16、rior to installation of back-up rod or bond breaker tape. 2. Use brush or other approved means that will reach all parts of joints. F. Take all necessary steps to prevent three sided adhesion of sealants. 3.3 BACKING INSTALLATION: A. Install back-up material, to form joints enclosed on three sides a
17、s required for specified depth of sealant. B. Where deep joints occur, install filler to fill space behind the back-up rod and position the rod at proper depth. C. Cut fillers installed by others to proper depth for installation of back-up rod and sealants. D. Install back-up rod, without puncturing
18、 the material, to a uniform depth, within plus or minus 3 mm (1/8 inch) for sealant depths specified. E. Where space for back-up rod does not exist, install bond breaker tape strip at bottom (or back) of joint so sealant bonds only to two opposing surfaces. F. Take all necessary steps to prevent thr
19、ee sided adhesion of sealants. SPEC WRITER NOTE: Detail joints correctly for symmetry of sealant installation. Do not use incorrect details. See ASTM C1193. 3.4 SEALANT DEPTHS AND GEOMETRY: A. At widths up to 6 mm (1/4 inch), sealant depth equal to width. B. At widths over 6 mm (1/4 inch), sealant d
20、epth 1/2 of width up to 13 mm (1/2 inch) maximum depth at center of joint with sealant thickness at center of joint approximately 1/2 of depth at adhesion surface. 3.5 INSTALLATION: A. General: 1. Apply sealants and caulking only when ambient temperature is between 5 degrees C and 38degrees C (40 an
21、d 100 degrees F). 2. Do not use polysulfide base sealants where sealant may be exposed to fumes from bituminous materials, or where water vapor in continuous contact with cementitious materials may be present. 3. Do not use sealant type listed by manufacture as not suitable for use in locations spec
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