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i~ <br />NCHFA HOUSZIVG REHABILITATION PROGRAMS -Energy Standards <br />starmwindaws.aze 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 confann 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 sununer by overhangs, <br />awnings, etc. <br />3.4 Starmwindows with •screens shall be installed if existing single-glazed prime <br />windows are sound and weatherized per 3.1, above. (Stormwindows over dauble- <br />glazed prime windows are eligible, but optional.) <br />X1.0 ~ 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 aze indicated, R-7 (minimum) insulated doors with double silicone <br />weatherstripping and energyefficient thresholds are preferred. All lights (windows in <br />doors) shall be double-glazed. <br />4.2 1411 exterior doors shall have thresholds if feasible. Defective thresholds shall <br />be repaired, if practicable, ar 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 />5ea1 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 shaIl.be installed on interior doom separating conditioned space from <br />unconditioned areas, <br />4.4 Ta promote warm-weather ventilation as well as cold weather comfort and <br />economy, combination storm/screen doors should be installed at mast exterior doors, <br />regazdless of the R-value and tightness of the prime door. <br />4S All holes, cracks and gaps around exterior door jambs, casings and sills, both <br />inside and outside, shall be caulked: Siliconized acrylicllatex caulk is preferred. <br />6 <br />