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. ' <br /> A. Apply insulation units to substrate by method indicated, complying with manufacturer's � <br /> recommendations. If no specific method is indicated,bond units to substrate with adhesive <br /> or use mechanical anchorage to provide permanent placennent and support ofunits.Overlap <br /> the layers of rigid insulation board on roof deck <br /> B. Seal joints between closed-cell{nonbreathing)insulation units by applying adhesive,mastic, � <br /> or sealant to edges of each unit to form a tight seal as units are shoved into place. Fill voids <br /> in completed installation with adhesive,mastic,or sealant as recommended by insulation <br /> manufacturer. � <br /> C. Set vapor retarder faced units with vapor retarder to warm side of construction,except as <br /> otherwise indicated. , <br /> ' D. Set reflective,foil-faced units accurately with not less than 0.75-inch air space in front of <br /> foil as indicated. � <br /> E. Stuff glass fiber loose fill insulation into miscellaneous voids and cavity spaces where <br /> shown. Compact to approximately 40 percent of normal maximum volume(to a densiiy of <br /> appro�cimately 2.S pcf}. � <br /> 3.8 INSTALLATION OF VAPOR RETARDERS <br /> A. GeneraI: E�ctend vapor retarder to extremities of areas to be protected from vapor ' <br /> tra.nsmission. Secure in place with adhesives or other anchorage system as indicated. <br /> Extend vapor retarder to cover miscellaneous voids in insulated suhstrates. <br /> B. Seal vertical joints in vapor retarders over framing by lapping not less than 2 wall studs. � <br /> Fasten vapor retarders to framing at top, end, and bottom edges, at perimeter of wall <br /> openings,and at Iap joints; space fasteners 15 inches o.c. � <br /> C. Seal overlapping joints in vapor cetarders with adhesives or tape per vapor retazder <br /> manufacturer's printed directions. Seal butt join#s and fastener penetrations with tape of <br /> type recoznmended by vapor retarder manufacturer. Locate all joints over framing members ' <br /> or other solid substrates. <br /> D. Firmly attach vapor retarders to substrates with mechanical fasteners or adhesives as ' <br /> recommended by vapor retarder manufacturer. <br /> E. Seal joints caused by pipes,conduits,electrical boxes,and similaz items penetrating vapor <br /> retarders with tape of type recommended by vapor retarder manufacturer to create an airtight � <br /> seal between penetrating objects and vapor retarder. <br /> F. Repair any tears or punctures in vapor retarders immediately before concealment by other � <br /> work. Cover with tape or another layer of vapor retarder. <br /> 3.1 U PROTECTION <br /> A. General: Protect installed insulation and vapor retarders from da.mage due to harmfu! � <br /> weather exposures, physical abase, and other causes. Provide temporary coverings or <br /> enclosures where insulation will be subject to abuse and cannot be concealed and protected ' <br /> by permanent construction immediately after installation. . <br /> END OF SECTION 07210 <br /> . � <br /> BUILDING INSULATION Page 6 of 6 � <br /> � <br />