DUCT WORK. 8.1 Foil-faced fiberglass blanket with vapor barrier. 8.1.1 Before wrapping the flexible blanket insulation, cut out and remove two inches of insulation at the butt and lateral ends of the flexible blanket. The two-inch laps will serve as vapor barrier flaps at all joints. All insulation will be wrapped tightly and neatly to all surfaces with all joints butted accurately. A completely sealed vapor barrier envelope must be provided. 8.1.2 Joints of the insulation will be lapped, sealed and taped with the proper sealer to provide a completely sealed vapor barrier envelope. The tape will be applied in a straight line with equal overlap on both sides of the joint. All punctures and voids must be properly insulated and sealed. 8.1.3 If a self-sealing tape is used, it shall be rubbed until it is free of air pockets or openings. 8.1.4 No raw glass shall be visible.
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Sources: Master Agreement, Master Agreement