ࡱ> WZVg 85bjbj HJr\r\+\VVVVVjjj8$4j)fLF(nnn d)f)f)f)f)f)f)$K+.8)V )VVnn4)>%>%>% HVnVn(>% d)>%>%''n *!'()0)'9/l"9/'9/V' >% ))$F ) 9/ > : Copyright 2010 by The American Institute of Architects (AIA) Exclusively published and distributed by Architectural Computer Services, Inc. (ARCOM) for the AIA SECTION 072713 - MODIFIED BITUMINOUS SHEET AIR BARRIERS GENERAL SUMMARY Section includes self-adhering, vapor-retarding, modified bituminous sheet air barriers. PREINSTALLATION MEETINGS Preinstallation Conference: Conduct conference at Project site. ACTION SUBMITTALS Product Data: For each type of product. Shop Drawings: For air-barrier assemblies. Include details for substrate joints and cracks, counterflashing strips, penetrations, inside and outside corners, terminations, and tie-ins with adjoining construction. INFORMATIONAL SUBMITTALS Product certificates. Product test reports. QUALITY ASSURANCE Installer Qualifications: An entity that employs installers and supervisors who are trained and approved by manufacturer. Mockups: Build mockups to set quality standards for materials and execution. Build integrated mockups of exterior wall assembly as shown on Drawings, incorporating backup wall construction, external cladding, window, storefront, door frame and sill, insulation, ties and other penetrations, and flashing to demonstrate surface preparation, crack and joint treatment, application of air barriers, and sealing of gaps, terminations, and penetrations of air-barrier assembly. Coordinate construction of mockups to permit inspection by Owner's testing agency of air barrier before external insulation and cladding are installed. Include junction with roofing membrane and foundation wall intersection. PRODUCTS PERFORMANCE REQUIREMENTS Retain option in "General" Paragraph below if air barrier serves as a primary or secondary drainage plane. General: Air barrier shall be capable of performing as a continuous vapor-retarding air barrierand as a liquid-water drainage plane flashed to discharge to the exterior incidental condensation or water penetration. Air-barrier assemblies shall be capable of accommodating substrate movement and of sealing substrate expansion and control joints, construction material changes, penetrations, and transitions at perimeter conditions without deterioration and air leakage exceeding specified limits. SELF-ADHERING SHEET AIR BARRIER Retain option in "Modified Bituminous Sheet" Paragraph below if application with VOC-conforming accessory materials is required by authorities having jurisdiction. Modified Bituminous Sheet: 40-mil- (1.0-mm-) thick, self-adhering sheet consisting of 36 mils (0.9 mm) of rubberized asphalt laminated to a 4-mil- (0.1-mm-) thick, cross-laminated polyethylene film with release liner on adhesive side. Retain "Products" Subparagraph and list of manufacturers and products below to require specific products or a comparable product from other manufacturers. HYPERLINK "http://www.specagent.com/LookUp/?ulid=6266&mf=04&src=wd"Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following HYPERLINK "http://www.specagent.com/LookUp/?uid=123456830761&mf=04&src=wd"Henry Company; BlueskinSA. HYPERLINK "http://www.specagent.com/LookUp/?uid=123456830760&mf=04&src=wd"Grace, W. R. & Co. - Conn.; Perm-A-Barrier Wall Membrane HYPERLINK "http://www.specagent.com/LookUp/?uid=123456830763&mf=04&src=wd"Tremco Incorporated, an RPM company; ExoAir110/110LT. Physical and Performance Properties: Air-permeance value in "Air Permeance" Subparagraph below is based on ABAA and energy-conservation requirements of the Massachusetts State Building Code, 780CMR, Ch.13. Air Permeance: Maximum 0.004 cfm/sq. ft. of surface area at 1.57-lbf/sq. ft. (0.02L/s x sq.m of surface area at 75-Pa) pressure difference; ASTME2178. Tensile Strength: Minimum 250 psi (1.7 MPa); ASTMD412, DieC. Ultimate Elongation: Minimum 200 percent; ASTMD412, DieC. Puncture Resistance: Minimum 40 lbf (180N); ASTME154. Water Absorption: Maximum 0.15 percent weight gain after 48-hour immersion at 70 degF (21 degC); ASTMD570. Vapor-permeance value in "Vapor Permeance" Subparagraph below is based on some listed products. Vapor Permeance: Maximum 0.05 perm (2.9 ng/Pa xs x sq.m); ASTME96/E96M, Water Method. ACCESSORY MATERIALS General: Accessory materials recommended by air-barrier manufacturer to produce a complete air-barrier assembly and compatible with primary air-barrier membrane. Termination Mastic: Air-barrier manufacturer's standard cold fluid-applied elastomeric liquid; trowel grade. Sprayed Polyurethane Foam Sealant: One- or two-component, foamed-in-place, polyurethane foam sealant, 1.5- to 2.0-lb/cu. ft. (24- to 32-kg/cu.m) density; flame-spread index of 25 or less according to ASTME162; with primer and noncorrosive substrate cleaner recommended by foam sealant manufacturer. EXECUTION SURFACE PREPARATION Mask off adjoining surfaces not covered by air barrier to prevent spillage and overspray affecting other construction. Remove fins, ridges, mortar, and other projections and fill honeycomb, aggregate pockets, holes, and other voids in concrete with substrate-patching membrane. Remove excess mortar from masonry ties, shelf angles, and other obstructions. Prepare, fill, prime, and treat joints and cracks in substrates. Remove dust and dirt from joints and cracks according to ASTMD4258. At changes in substrate plane, apply sealant or termination mastic beads at sharp corners and edges to form a smooth transition from one plane to another. INSTALLATION Revise this article to coordinate with drawing details. Place sheet materials over a firm backing to provide structural support for achieving an effective and permanent air barrier. General: Install modified bituminous sheets and accessory materials according to air-barrier manufacturer's written instructions and according to recommendations in ASTMD6135. Retain subparagraph below if installation at low temperatures may be required. Verify that retained manufacturers produce low-temperature products. An upper-limit temperature may be recommended by air-barrier manufacturers to reduce workmanship problems with more aggressive adhesion. When ambient and substrate temperatures range between 25 and 40 degF (minus 4 and plus 5 degC), install self-adhering, modified bituminous air-barrier sheet produced for low-temperature application. Do not install low-temperature sheet if ambient or substrate temperature is higher than 60 degF (16 degC). Apply primer to substrates at required rate and allow it to dry. Limit priming to areas that will be covered by air-barrier sheet on same day. Reprime areas exposed for more than 24 hours. Retain subparagraph below if using glass-fiber-surfaced gypsum sheathing. Prime glass-fiber-surfaced gypsum sheathing with number of prime coats needed to achieve required bond, with adequate drying time between coats. Apply and firmly adhere modified bituminous sheets horizontally over area to receive air barrier. Accurately align sheets and maintain uniform 2-1/2-inch- (64-mm-) minimum lap widths and end laps. Overlap and seal seams, and stagger end laps to ensure airtight installation. Apply sheets in a shingled manner to shed water without interception by any exposed sheet edges. Roll sheets firmly to enhance adhesion to substrate. Seal top of through-wall flashings to air-barrier sheet. Seal exposed edges of sheet at seams, cuts, penetrations, and terminations not concealed by metal counterflashings or ending in reglets with termination mastic. Install air-barrier sheet and accessory materials to form a seal with adjacent construction and to maintain a continuous air barrier. Connect and seal exterior wall air-barrier membrane continuously to roofing-membrane air barrier, concrete below-grade structures, floor-to-floor construction, exterior glazing and window systems, glazed curtain-wall systems, storefront systems, exterior louvers, exterior door framing, and other construction used in exterior wall openings, using accessory materials. Wall Openings: Prime concealed, perimeter frame surfaces of windows, curtain walls, storefronts, and doors. Apply transitions and flashing so that a minimum of 3 inches (75 mm) of coverage is achieved over each substrate. Maintain 3 inches (75 mm) of full contact over firm bearing to perimeter frames with not less than 1 inch (25 mm) of full contact. Fill gaps in perimeter frame surfaces of windows, curtain walls, storefronts, doors, and miscellaneous penetrations of air-barrier membrane with foam sealant. At end of each working day, seal top edge of air-barrier material to substrate with termination mastic. Repair punctures, voids, and deficient lapped seams in air barrier. Slit and flatten fishmouths and blisters. Patch with air-barrier sheet extending 6 inches (150 mm) beyond repaired areas in all directions. Do not cover air barrier until it has been tested and inspected by Owner's testing agency. Correct deficiencies in or remove air barrier that does not comply with requirements; repair substrates and reapply air-barrier components. FIELD QUALITY CONTROL Coordinate test and inspection requirements in this article with Owner's testing agency. Testing Agency: Owner will engage a qualified testing agency to perform tests and inspections. Inspections: Air-barrier materials, accessories, and installation are subject to inspection for compliance with requirements. Tests: As determined by Owner's testing agency from among the following tests: Retain "Qualitative Air-Leakage Testing" Subparagraph below if testing to locate air-leakage sites is required and if quantitative air-leakage testing is required. Retain "Quantitative Air-Leakage Testing" Subparagraph below if testing to quantify air-leakage rate is required. Quantitative Air-Leakage Testing: Air-barrier assemblies will be tested for air leakage according to ASTME783. Adhesion Testing: Air-barrier assemblies will be tested for minimum air-barrier adhesion of 16 lbf/sq. in. (110 kPa) according to ASTMD4541 for each 600 sq. ft. (56 sq.m) of installed air barrier or part thereof. Air barriers will be considered defective if they do not pass tests and inspections. Apply additional air-barrier material, according to manufacturer's written instructions, where inspection results indicate insufficient thickness. Remove and replace deficient air-barrier components for retesting as specified above. Repair damage to air barriers caused by testing; follow manufacturer's written instructions. Protect air-barrier system from damage during application and remainder of construction period, according to manufacturer's written instructions. Protect air barrier from exposure to UV light and harmful weather exposure as required by manufacturer. If exposed to these conditions for more than 30 days, remove and replace air barrier or install additional, full-thickness, air-barrier application after repairing and preparing the overexposed membrane according to air-barrier manufacturer's written instructions. Protect air barrier from contact with incompatible materials and sealants not approved by air-barrier manufacturer. 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