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Home My WebLink About07270.pdf BICKFORD OF CARMEL, IN 12/12/2012 AIR BARRIER/WEATHER RESISTANT BARRIER 07270 - 1 SECTION 07270 - AIR BARRIER/WEATHER RESISTANT BARRIER PART 1 - GENERAL 1.1 SUMMARY A. This Section includes the air barrier/weather resistance barrier, more commonly known as building wrap, and associated accessories including flexible flashing at all window sill conditions. 1. Weather barrier membrane 2. Seam Tape 3. Flashing 4. Fasteners B. REFERENCES 1. ASTM International ASTM C920; Standard Specification for Elastomeric Joint Sealants ASTM C1193; Standard Guide for Use of Joint Sealants ASTM D882; Test Method for Tensile Properties of Thin Plastic Sheeting ASTM D1117; Standard Guide for Evaluating Non-woven Fabrics ASTM E84; Test Method for Surface Burning Characteristics of Building Materials ASTM E96; Test Method for Water Vapor Transmission of Materials ASTM E1677; Specification for Air Retarder Material or System for Framed Building Walls ASTM E2178; Test Method for Air Permeance of Building Materials 2. AATCC – American Association of Textile Chemists and Colorists Test Method 127 Water Resistance: Hydrostatic Pressure Test 3. TAPPI Test Method T-410; Grams of Paper and Paperboard (Weight per Unit Area) Test Method T-460; Air Resistance (Gurley Hill Method). 1.2 SUBMITTALS A. General: Submit each item in this Article according to the conditions of the Contract and Division I Specifications Sections. 1. Product Data: Submit manufacturer current technical literature for each component. 2. Samples: Weather Barrier membrane, minimum 8-1/2 inches by 11 inch. 3. Quality Assurance Submittals a. Manufacturer Instructions: Provide manufacturer’s written installation instructions. 1.3 DELIVERY, STORAGE, AND HANDLING A. Delivery: Deliver materials in manufacturer’s original, unopened, undamaged containers with identification labels intact. BICKFORD OF CARMEL, IN 12/12/2012 AIR BARRIER/WEATHER RESISTANT BARRIER 07270 - 2 B. Storage and Protection: Protect materials from rain and physical damage. Provide cover on top and on all sides, allowing for adequate ventilation. Store flashing where temperatures will not exceed 90 degrees F (32 degrees C) for extended periods. Store all products in a dry area away from high heat, flames or sparks. C. Store products in manufacturer’s unopened packaging until ready for installation and dispense the needed amounts of materials from the manufacturer box. 1.4 PROJECT CONDITIONS A. Environmental Limitations: Do not install DuPont™ FlexWrap™ on wet or damp surfaces. Surfaces should also be free from dirt, oils, lubricants or other debris that may inhibit adhesion of the flashing tape to the substrate. After precipitation, allow a minimum of 24 hours for drying before installing the flashing tape. For optimal performance, install DuPont™ FlexWrap™ at temperatures above 40 degrees F (or 4 degrees C). 1.5 QUALITY ASSURANCE A. Installer shall have experience with installation of similar weather barrier assemblies under similar conditions. B. Installation shall be in accordance with manufacturer’s installation guidelines and recommendations. C. Source Limitations: Provide weather barrier and accessory materials produced by single manufacturer 1.6 WARRANTY A. Special Warranty: Written warranty, executed by manufacturer agreeing to repair or replace air barrier/weather resistance barrier that fail in materials and workmanship within five years from date of Substantial Completion. PART 2 - PRODUCTS 2.1 MANUFACTURERS A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to the following: DuPont Weatherization Systems 4417 Lancaster Pike Chestnut Run Plaza 721 Wilmington, DE 19805 800-448-9835 http://construction.TYVEK.com 2.2 MATERIALS BICKFORD OF CARMEL, IN 12/12/2012 AIR BARRIER/WEATHER RESISTANT BARRIER 07270 - 3 A. Available Products: Subject to compliance with requirements, products that may be incorporated into the Work include, but are not limited to the following: DuPont™ Tyvek® HomeWrap®: A spunbonded olefin, non-woven, non-perforated weather resistant barrier. B. Performance Characteristics 1. Air Penetration: <.004 cfm/ft2 at 1.57 psf, when tested in accordance with ASTM E2178. Type I per ASTM E1677. 2. Water Vapor Transmission: 56 perms, when tested in accordance with ASTM E96-05, Method A. 3. Water Penetration Resistance: 250 cm when tested in accordance with AATCC Test Method 127. 4. Basis Weight: 1.8 oz/yd2, when tested in accordance with TAPPI Test Method T-410. 5. Air Resistance: 1200 seconds, when tested in accordance with TAPPI Test Method T- 460. 6. Tensile Strength: 30/30 lbs/in., when tested in accordance with ASTM D882. 7. Tear Resistance: 8/6 lbs, when tested in accordance with ASTM D1117. 8. Surface Burning Characteristics: Class A, when tested in accordance with ASTM E84. Flame Spread: 15, Smoke Developed: 15 C. ACCESSORIES 1. Products/Systems: Self-Adhering Flexible flashing tape, DuPont FlexWrap or manufacturers approved equal. a. Elasticized flexible flashing tape complying with the following: 1) Face Material composition: Elasticized polyethylene laminate. 2) Adhesive composition; Butyl adhesive containing non-halogen fire retardant additive 3) Thickness: > 60 mils. 4) Release liner: 2 part siliconized paper. 5) Elastic Elongation , MD (length @ Full Extension/ Length @ Relaxed): >230% @ 70 F. 2. Products/Systems: Self Adhering Straight flashing tape, DuPont StraightFlash or manufacturers approved equal a. Durable Polyethlyene Laminate Flashing Tape complying with the following: 1) Face Material composition: Polyethylene laminate 2) Adhesive compostion: Butyl adhesive containing fire retardant additive 3) Thickness: 30 mils 4) Release liner: 1 piece siliconized paper 3. Sealing Tape/Fasteners a. Manufacturers standard, similar or equal to DuPont™ Tyvek® Wrap Caps, as manufactured by DuPont Building Innovations: #4 nails with large 1-inch plastic cap fasteners. 4. Caulks and Sealants: polyurethane or elastomeric sealants a. Available Products: 1) DuPont Weatherization Sealant 2) Tremco 830 3) Tremco Butyl 4) Sealants recommended by the weather barrier manufacturer.. 5. Primer: 1. Available products: a. 3M High Strength 90 b. Other products as approved and recommended by the flashing tape manufacturer BICKFORD OF CARMEL, IN 12/12/2012 AIR BARRIER/WEATHER RESISTANT BARRIER 07270 - 4 PART 3 - EXECUTION 3.1 EXAMINATION A. Verify substrate and surface conditions are in accordance with weather barrier manufacturer recommended tolerances prior to installation of weather barrier and accessories. 3.2 INSTALLATION A. Install weather barrier over exterior face of exterior wall substrate in accordance with manufacturer recommendations. B. Start weather barrier installation at a building corner, leaving 6-12 inches of weather barrier extended beyond corner to overlap. C. Install weather barrier in a horizontal manner starting at the lower portion of the wall surface. Maintain weather barrier plumb and level. D. Extend bottom roll edge over sill plate interface 2” to 3” minimum. Seal weather barrier with sealant or tape. Shingle weather barrier over back edge of thru-wall flashings and seal weather barrier with sealant or tape. Ensure weeps are not blocked. E. Subsequent layers shall overlap lower layers a minimum of 6 inches horizontally in a shingling manner. F. Window and Door Openings: Extend weather barrier completely over openings. G. Weather Barrier Attachment: 1. Attach weather barrier to studs through exterior sheathing. Secure using weather barrier manufacturer recommended fasteners, spaced 12 -18 inches vertically on center along stud line, and 24 inch on center, maximum horizontally 3.3 SEAMING A. Seal seams of weather barrier with seam tape at all vertical and horizontal overlapping seams. B. Seal any tears or cuts as recommended by weather barrier manufacturer 3.4 OPENING PREPARATION A. Cut weather barrier membrane in a modified “I-cut” pattern. 1. Cut weather barrier horizontally along the bottom of the header. 2. Cut weather barrier vertically 2/3 of the way down from top center of window opening. 3. Cut weather barrier diagonally from bottom of center vertical cut to the left and right corners of the opening. 4. Fold side and bottom weather barrier flaps into window opening and fasten B. Cut a head flap at 45-degree angle in the weather barrier membrane at window head to expose 8 inches of sheathing. Temporarily secure weather barrier membrane flap away from sheathing with tape. BICKFORD OF CARMEL, IN 12/12/2012 AIR BARRIER/WEATHER RESISTANT BARRIER 07270 - 5 3.5 FLASHING A. Cut 9-inch wide DuPont™ FlexWrap™ a minimum of 12 inches longer than width of sill rough opening. Apply primer as recommended by the manufacturer. B. Cover horizontal sill by aligning DuPont™ FlexWrap™ edge with inside edge of sill. Adhere to rough opening across sill and up jambs a minimum of 6 inches. Secure flashing tightly into corners by working in along the sill before adhering up the jambs. C. Fan DuPont™ FlexWrap™ at bottom corners onto face of wall. Firmly press in place. Mechanically fasten fanned edges. D. On exterior, apply continuous bead of sealant to wall or backside of window mounting flange across jambs and head. Do not apply sealant across sill. E. Install window according to manufacturer’s instructions. F. Apply 4-inch wide strips of DuPont™ StraightFlash™ at jambs overlapping entire mounting flange. Extend jamb flashing 1-inch above top of rough opening and below bottom edge of sill flashing. G. Apply 4-inch wide strip of DuPont™ StraightFlash™ as head flashing overlapping the mounting flange. Head flashing should extend beyond outside edges of both jamb flashings. H. Position weather barrier head flap across head flashing. Adhere using 4-inch wide DuPont™ StraightFlash™ over the 45-degree seams. I. Tape head flap in accordance with manufacturer recommendations. J. On interior, install backer rod in joint between frame of window and flashed rough framing. Apply sealant around entire window to create air seal. Apply sealant in accordance with sealant manufacturer’s instructions and ASTM C1193 3.6 PROTECTION A. Protect installed weather barrier from damage END OF SECTION