Revised Specifications - the Public Building Commission of Chicago

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PBC Control Date: 1_03/22/10 Project Rev: A_07/02/10 b. Masonry joints are flush and completely filled with mortar, and all excess mortar sitting on masonry ties has been removed. 4. Verify substrate is visibly dry and free of moisture. Test for capillary moisture by plastic sheet method according to ASTM D 4263 and take suitable measures until substrate passes moisture test. 5. Verify sealants used in sheathing are compatible with membrane proposed for use. 3.2 SURFACE PREPARATION A. Clean, prepare, and treat substrate according to manufacturer's written instructions. Ensure clean, dust-free, and dry substrate for air and vapor barrier application. Mask off adjoining Surfaces to prevent overspray and spillage. B. Prime substrate for application of sheet membrane transition strips as recommended by manufacturer and as follows: 1. Prime masonry, substrates with conditioning primer. 2. Prime glass-fiber surfaced gypsum sheathing an adequate number of coats to achieve required bond, with adequate drying time between coats. 3. Prime wood, metal, and painted substrates with primer. 4. Prepare, treat, and seal vertical and horizontal surfaces at terminations and penetrations through air and vapor barrier and at protrusions. C. Prime substrate for application of fluid-applied air and vapor barrier if recommended by manufacturer based on project conditions and as follows. 3.3 INSTALLATION A. Air and Vapor Barrier Installation: Install transition strip materials and fluid-applied air and vapor barrier to provide continuity throughout the building envelope. Install materials in accordance with AABA recommendations and manufacturer's recommendations and as follows, unless manufacturer recommends other procedures in writing based on project conditions or particular requirements of their recommended materials: 1. Provide materials and installation to bridge and seal the following, but not limited to, air leakage pathways and gaps: a. Connection of the wall air and vapor barrier system to the roof air and vapor barrier system. b. Connection of the wall air and vapor barrier system to the foundation. c. Expansion joints. d. Openings and penetrations of window frames, storefront and curtain wall. e. Barrier precast concrete and other envelope systems. f. Piping, conduit, duct, and similar penetrations. g. Masonry ties, screws, bolts and similar penetrations. h. All other air leakage pathways in the building envelope. CHICAGO POLICE DEPARTMENT 12 TH DISTRICT POLICE STATION 07262-6 FLUID APPLIED AIR AND PBC-PROJECT# 09070 VAPOR BARRIER
PBC Control Date: 1_03/22/10 Project Rev: A_07/02/10 2. Apply primer for transition strips at rate recommended by manufacturer. Allow primer to dry completely before transition strip application. Apply as many coats as necessary for proper adhesion. 3. Apply primer for fluid-applied air and vapor barrier as recommended by fluidapplied air and vapor barrier manufacturer. Based on manufacturer’s recommendation, no primer may be required for the fluid-applied materials. 4. Apply fluid-applied air and vapor barrier using equipment and methods recommended by manufacturer, to achieve a dry film thickness as recommended by the manufacturer. 5. Apply fluid-applied air and vapor barrier and transition strips to shed water naturally without interception by a sheet edge, unless that edge is sealed with permanently flexible termination mastic. 6. Position subsequent sheets of transition strips applied above so that membrane overlaps the membrane sheet below by a minimum of 2 inches (50 mm), unless greater overlap is recommended by manufacturer. Roll into place with roller. 7. Overlap horizontally adjacent pieces of transition strips a minimum of 2 inches (50 mm), unless greater overlap is recommended by manufacturer. Roll seams with roller. 8. Seal around all penetrations with termination mastic, extruded silicone sealant, membrane counterflashing or other procedure in accordance with manufacturer’s recommendations. 9. Connect air and vapor barrier in exterior wall assembly continuously to all adjacent construction and seal penetrations. 10. At changes in substrate plane, provide transition material (bead of sealant, mastic, extruded silicone sealant, membrane counterflashing or other material recommended by manufacturer) under membrane to eliminate all sharp 90 degree inside corners and to make a smooth transition from one plane to another. 11. Provide mechanically fastened non-corrosive metal sheet to span gaps in substrate plane and to make a smooth transition from one plane to the other. Membrane shall be continuously supported by substrate or as recommended by the manufacturer. 12. At through-wall flashings, provide an additional 6 inch wide strip of manufacturer’s recommended membrane counterflashing to seal top of throughwall flashing to membrane or as recommended by manufacturer . Seal exposed top edge of strip with bead of mastic or as recommended by manufacturer. 13. At deflection and control joints, provide backup for the membrane to accommodate anticipated movement. 14. At expansion and seismic joints provide transition to the joint assemblies. 15. Apply a bead or trowel coat of mastic along membrane seams at reverse lapped seams, rough cuts, and as recommended by the manufacturer. 16. At end of each working day, seal top edge of membrane to substrate with termination mastic. 17. Do not allow materials to come in contact with chemically incompatible materials. 18. Do not expose membrane to sunlight longer than as recommended by the manufacturer. 19. Inspect installation prior to enclosing assembly and repair punctures, damaged areas and inadequately lapped seams with a patch of membrane lapped as recommended by manufacturer. CHICAGO POLICE DEPARTMENT 12 TH DISTRICT POLICE STATION 07262-7 FLUID APPLIED AIR AND PBC-PROJECT# 09070 VAPOR BARRIER
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Revised Specifications - the Public Building Commission of Chicago

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