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i <br /> • A. Install block and board insulation as follows: <br /> 1. Adhesive and Band Attachment: Secure block and board <br /> insulation tight and smooth with at least 50 percent <br /> coverage of adhesive. Install bands spaced 12 inches apart. <br /> Protect insulation under bands and at exterior corners with <br /> metal corner angles. Fill joints, seams, and chipped edges <br /> with vapor barrier compound. <br /> � <br /> 2. Speed Washers Attachment: Secure insulation tight and <br /> smooth with speed washers and welded pins. Space anchor <br /> pins 18 inches apart each way and 3 inches from insulation <br /> joints. Apply vapor barrier coating compound to insulation <br /> ; in contact, open joints, breaks,punctures, and voids in <br /> insulation. <br /> � <br /> B. Blanket Insulation: Install tight and smooth. Secure to ducts <br /> ihaving long sides or diameters as follows: <br /> � <br /> 1. Smaller Than 24 Inches: Bonding adhesive applied in 6 <br /> inches wide transverse strips on 12 inches centers. <br /> • 2. 24 Inches and Larger: Anchor pins spaced 12 inches apart <br /> � each way. Apply bonding adhesive to prevent sagging of <br /> � the insulation. <br /> I <br /> 3. Overlap joints 3 inches. <br /> 4. Sea1 joints,breaks, and punctures with vapor barrier <br /> compound. <br /> 3.7 JACKETS <br /> A. Foil and Paper Jackets (FP): Install jackets drawn tight. Install lap <br /> � or butt strips at joints with material same as jacket. Secure with <br /> � adhesive. Install jackets with 1-1/2 inches laps at longitudinal <br /> joints and 3 inch wide butt strips at end joints. � <br /> � <br /> 1. Seal openings, punctures, and breaks in vapor barrier <br /> jackets and exposed insulation with vapor barrier <br /> compound. <br /> B. Interior Exposed Insulation: Install continuous PVC jackets. <br /> • <br /> ICT 99184 <br /> � 15250 - 9 <br />