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and that combined elements are waterproof and weathertight.Anchor units securely to supporting structural <br /> substrates, adequate to withstand lateral and thermal stresses as well as inward and outwazd loading <br /> pressures. <br /> 1. Except as otherwise indicated, install roof Sky lights according to construction deta.ils of <br /> "NRCA Roofing and Waterproofing Manual.�" <br /> B. Isolation: Where metal surfaces of units are to be installed in contact with incompatible metal or <br /> corrosive substrates, including wood, apply bituminous coating on concealed metal surfaces, or provide <br /> another permanent separation. <br /> C. Flange Seals:Except as otherwise indicated,set flanges or accessory units in a thick bed of roofing <br /> cement to form a seal. <br /> D. Cap Flashing: Where cap flashing is required as component to the Sky light,install to provide an <br /> adequate waterproof overlap with roofing or roof flashing(as counter flashing). Seal with thick bead of <br /> mastic sealant,except where overlap is indicated to be left open for ventilation. <br /> E. Do not proceed with glazing until unsatisfactory conditions have been corrected. <br /> 3.2 GLAZING,GENERAL <br /> A. Comply with combined recommendations of manufacturers of acrylic,sealants,gaskets,and other <br /> glazing materials, except where more stringent requirements are indicated, including those in referenced <br /> glazing publications. <br /> B. Glazuig channel dimensions as indicated on Drawings provide necessary bite on glass,minimum <br /> edge and face clearances,and adequate sealant thicknesses,with reasonable tolerances. Adjust as required <br /> by Project conditions during installation. <br /> C. Protect acrylic from edge damage during handling and installation as follows: <br /> D. Provide 1/8-inch minimum bite of spacers on acrylic and use thickness equal to sealant width. <br /> 1. With glazing tape,use thickness slightly less than fmal compressed thickness of tape. <br /> E. Provide edge blocking to comply with requirements of referenced glazing publications,unless <br /> otherwise requued by acrylic manufacturer. <br /> F. Where wedge-shaped gaskets are driven into one side of channel to pressuri��e sealant or gasket on <br /> opposite side, provide adequate anchorage so gasket cannot walk out when installation is subjected to <br /> movement. <br /> G. Square cut wedge-shaped gaskets at comers and install gaskets in manner recommended by gasket <br /> manufacturer to prevent corners from pulling away; seal corner joints and butt joints with sealant <br /> recommended by gasket manufacturer. <br /> 3.3 PROTECTION AND CLEANING <br /> A. Clean exposed metal and plastic surfaces according to manufacture's instructions. <br /> B. Clean and polish plastic Sky light units,inside and outside 5 days prior to date of substantial <br /> completion. <br /> END OF SECTION 0881i0 <br /> SKY LIGHTS <br /> Page 4 of 4 <br />