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1 <br /> NCHFA HOUSING REHABILITATION PROGRAMS -- Energy Standards <br /> stormwindows are to be installed). Replacement windows should have a maximum <br /> infiltration of .37 cfm per linear foot of edge of operable sash (See manufacturer's <br /> specifications for compliance.) Double weatherstripping is recommended. <br /> 3.3 When windows are proposed for new locations they should conform to sections <br /> 2.4 and 3.2, above. Where feasible, new windows should be minimized on east and <br /> west sides. South-facing windows should be shaded in summer by overhangs, <br /> awnings, etc. <br /> 3.4 Stormwindows with screens shall be installed if existing single-glazed prune <br /> windows are sound and weatherized per 3.1, above. (Stormwindows over double- <br /> glazed prime windows are eligible, but optional.) <br /> 4.0 Doors. <br /> 4.1 All exterior doors and openings between conditioned and unconditioned spaces <br /> shall be treated as appropriate to achieve minimal air infiltration and are to include <br /> thresholds, weatherstripping and storm doors, as practicable. Where new doors or <br /> replacement doors are indicated, R-7 (minimum) insulated doors with double silicone <br /> weatherstripping and energy-efficient thresholds are preferred. All lights (windows in <br /> doors) shall be double-glazed. <br /> 4.2 All exterior doors shall have thresholds if feasible. Defective thresholds shall <br /> be repaired, if practicable, or replaced. New/replacement thresholds shall be either of <br /> the following types: 1) A metal body with a vinyl insert that contacts the bottom of <br /> the door for the entire length of the threshold or width of the door; or, 2) A metal <br /> saddle with a door shoe on the bottom of the door. (The second option is preferred.) <br /> Seal base and edges of threshold with caulk or foam. <br /> 4.3 Door shoes shall be used on exterior doors if threshold installation is not <br /> practicable or when a threshold alone will not stop air infiltration. Door shoes and <br /> thresholds shall be installed on interior door.; separating conditioned space from <br /> unconditioned areas. <br /> 4.4 To promote warm-weather ventilation as well as cold weather comfort and <br /> economy, combination storm/screen doors should be installed at most exterior doors, <br /> regardless of the R-value and tightness of the prime door. <br /> 4.5 All holes, cracks and gaps around exterior door jambs, casings and sills, both <br /> inside and outside, shall be caulked. Siliconized acrylic/latex caulk is preferred. <br /> 6 <br />