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NCHFA HOUSING REHABILITATION PROGRAMS -- Energy Standards <br /> 2.5.2 Duct insulation shall include a vapor barrier on the outside surface, <br /> have a flame-spread rating not greater than 25, and have a smoke density not <br /> greater than 50. Do not use batt insulation (commonly used for walls, ceilings <br /> and floors) as duct insulation. <br /> 2.5.3 Staples used to secure duct insulation shall be minimum 1/2 inch <br /> outward-clinching heavy duty staples. Prior to insulating, duct system seams <br /> and joints shall be sealed with vapor-barrier mastic or approved equally-durable <br /> alternative. <br /> 2.6 Insulation of Water Supply Pipes. All water supply pipes in unconditioned <br /> spaces shall be insulated with 1/2 inch (minimum) preformed foam insulation or <br /> equivalent insulation material labeled for use on pipes and meeting minimum <br /> requirements as in Federal Standards ASTM C592-80 and ASTM 184. Insulation <br /> shall be installed such that no gaps exist and be securely fastened. <br /> 2.7 Insulation of Water Heaters. Electric water heaters in accessible <br /> unconditioned spaces shall be insulated to R-6 (minimum) using commercial kits or. <br /> foil- or vinyl-faced batts (with facing outside). Access plates to heating elements and <br /> thermostat controls shall not be covered with insulation; nor shall junction boxes, <br /> - cover plates, or pressure-relief or drain valves be covered. Do not insulate below tank <br /> level if the water heater has a dry element. Stop blankets one inch above floor level. <br /> 2.8 Insulation Certification. An insulation certification card shall be furnished by <br /> the contractor and posted at a conspicuous location within the structure. This <br /> certification shall indicate the R-Value, minimum thickness, maximum coverage and <br /> minimum weight per square foot of the insulation installed for the walls, ceiling and <br /> floor. Preferred locations for the certification card are the inside surface of a <br /> crawlspace access door or stapled to a roof truss or stiffknee within 5 feet of an attic <br /> access door. <br /> 3.0 Windows <br /> 3.1 Existing prime windows shall be sealed against infiltration to the maximum <br /> practicable extent. Cracked, loose and/or brittle putty shall be replaced with new <br /> glazing compound. All cracks, holes and gaps around interior and exterior casing and <br /> jambs shall be caulked. Operable sash shall be weatherstripped as appropriate to the <br /> type of sash. Do not use felt strip or open-cell foam types of weatherstripping. Do <br /> not paint weatherstripping. <br /> 3.2 If existing prime windows are deemed dilapidated (beyond cost-effective <br /> rehabilitation), they shall be replaced with new double-glazed units (whether or not <br /> 5 <br />