VA 07 57 13-2011 SPRAYED POLYURETHANE FOAM ROOFING.pdf

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1、10-11 07 57 13 - 1 SECTION 07 57 13 SPRAYED POLYURETHANE FOAM ROOFING SPEC WRITER NOTES: 1. This roofing system is for application over structural concrete deck. If this system is considered for decks other than structural concrete, the manufacturers of the roofing materials should be consulted. Thi

2、s system should not be used on lightweight concrete, over cold storage areas or when other than light foot traffic is anticipated on the roof. Broomed finish should be specified for the concrete deck. 2. Use granules where appearance is important and for walkways. 3. Delete between / _/ if not appli

3、cable to project. Also delete any other item or paragraph as required and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION A. This roofing system consists of a layer of sprayed in-place urethane foam roof insulation covered with two coats of silicone rubber protective coating /and surfaced

4、with ceramic granules/. B. Roofing system to conform to requirements of a Class A system under UL 790. 1.2 SUBMITTALS A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES. B. Manufacturers Data: Showing complete instructions for installation. /C. Samples: Ceramic G

5、ranules, / each color available / color as specified in Section 09 06 00, SCHEDULE FOR FINISHES./ 1.3 DELIVERY AND STORAGE A. Deliver materials to the job site in their original unopened packages, clearly marked with the manufacturers name, brand name and description of contents. B. Store materials

6、in clean, dry areas, away from excessive heat, sparks and open flame. C. Ventilate storage areas to prevent build-up of flammable gases. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 07 57 13 - 2 1.4 COORDINATION Coordinate roofing operations

7、 with sheet metal work so that flashings are installed to permit continuous elastomeric roofing operations. 1.5 APPLICABLE PUBLICATIONS A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by basic designation only.

8、B. American Society for Testing and Materials (ASTM): C177-10 Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus C1029-10 . Spray-Applied Rigid Cellular Polyurethane Thermal Insulation D412-06 Vulcanized Rubber and Thermoplastic Elasto

9、mers-Tension D2240-05(R2010) Rubber Property-Durometer Hardness C. Underwriters Laboratories, Inc. (UL): 790-08 . Safety Tests for Fire Tests of Roof Coverings PART 2 - PRODUCTS 2.1 MATERIALS SPEC WRITER NOTE: Use R value at 5.56 per 25 mm (inch) for calculating thickness required. A. Urethane Foam:

10、 1. ASTM C1029, Type III. 2. Thermal Conductivity conforming to ASTM C177. B. Elastomeric Protective Coating: Silicone rubber, two coat system (base coat of light color and top coat of dark color), shall bond to urethane foam and have the following properties: PROPERTY ASTM TEST METHOD VALUE Tensile

11、 Strength, Mpa(psi) D412 3.8-6.5 (550 - 650) Elongation, percent D412 150 - 200 Hardness D2240 65 /C. Ceramic Granules: No. 11 screen size, color as selected, dry and free from dust./ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 07 57 13 - 3

12、 PART 3 - EXECUTION 3.1 GENERAL Installation shall comply with the manufacturers instructions, except as otherwise specified. SPEC WRITER NOTE: The allowable coefficient of heat transmission or U-value, will be inserted in the blank space. Roof slope should be obtained by sloping the structural deck

13、. When slope is accomplished by varying the thickness of insulation, delete the last sentence of the paragraph and substitute “The U-value shall be based on the average thickness of the insulation“. 3.2 THICKNESS OF INSULATION A. Thickness of insulation: Provide a coefficient of heat transmission or

14、 U-value, of _. B. Use R factor of 0.38/cm (5.56 per inch) of the insulation in the computation of the overall R value. C. The minimum thickness of insulation: 1. 25 mm (one inch) on common roof areas. 2. 13 mm (1/2-inches) at drains. 3.3 PREPARATION A. Surfaces to receive elastomeric roofing: Dry a

15、nd free of loose coatings, surface curing agents, wax or other contaminants. B. Workmen shall wear clean, soft-soled sneaker-type shoes. 3.4 PROTECTION OF ADJACENT SURFACES Protect surfaces near roofing operations from spray or roofing materials. 3.5 INSTALLATION OF INSULATION A. Spray foam on the p

16、repared surface in 13 mm (1/2- inch) lifts. Time between lifts shall not exceed 4 hours. B. The finished surface shall be smooth, free of voids blisters and crevices and free draining. C. Extend foam up walls and around roof projections to form cants and flashings that terminate at least 50 mm (two

17、inches) above finished roof surface. D. Cured foam: Free from water, dust, oils and other materials which would impair adhesion of the protective coating. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 07 57 13 - 4 E. No foam shall be allowed

18、to stand overnight without a base protective coating. Cure foam at least one hour before application of protective coating. F. Correct any nonadherence of foam to substrate and finish pinholes flush with an approved sealant before final coating is applied. G. Do not overspray to correct an unaccepta

19、ble surface condition. H. The finished roof surface shall not vary more than 13 mm (1/2-inch) when measured with a 3000 mm (10 foot) straight edge parallel and perpendicular to the roof slope. 3.6 PROTECTIVE COATING A. Coating shall consist of a base coat and a top coat. B. Clean base coat exposed f

20、or more than 24 hours with a detergent solution, thoroughly rinse and dry, then give another covering of base coating before applying the top coat. C. No traffic allowed on finished areas for 24 hours after installation. D. Base coat shall have a dry film thickness of not less (0.2 mm) 8 mils. E. Co

21、ating shall completely cover the foam and extend up vertical surfaces two inches beyond foam. F. Coating shall be dry and clean before application of top coat. G. Top coat applied at right angles to the directions of the base coat application and shall fully cover the base coat. H. Total dry film th

22、ickness shall be not less than 0.5 mm 20 mils. /I. Granules: 1. Apply within five minutes of top coat application, using pressure equipment, at a rate of 2.4 Kg/m(50 pounds per 100 square feet). 2. Apply a minimum of two passes made at right angles to each other. 3. Finished granule system shall be

23、uniform over entire surface with no apparent void areas./ J. Service Walks: 1. Apply after the protective coating system has been completed and cured. 2. Fiber-glass fabric 600 mm (4 inches) wide set into a third layer of protective coating and smoothed with brush or roller. 3. Coated a minimum of 1

24、50 mm (six inches) beyond each side and covered with roofing granules. 3.7 EQUIPMENT CALIBRATION A. Spray equipment for two component system: 1. Calibrated each day at start of operations and; Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 07

25、57 13 - 5 a. After each restart if spraying operations have been terminated for more than one hour. b. Whenever there is a change in fan pattern or pressure. c. Whenever slow curing areas are noticed. d. Whenever a change is made in hose length or working height and after change-over between materia

26、ls. B. Calibration shall consist of demonstrating that the equipment is adjusted to deliver component in the proper proportions. C. Calibration tests: Done on the roof adjacent to the area to be sprayed. - - - E N D - - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-