Figure 5-28.—Application of insulation.the edges of the studs. After the drywall is installed orplastering is completed, the film is trimmed around thewindow and door openings.Reflective insulation, in a single-sheet form withtwo reflective surfaces, should be placed to divide thespace formed by the framing members into twoapproximately equal spaces. Some reflective insulationsinclude air spaces and are furnished with nailing tabs.This type is fastened to the studs to provide at least a3/4-inch space on each side of the reflective surfaces.Fill insulation is commonly used in ceiling areas andis poured or blown into place (fig. 5-28, view C). A vaporbarrier should be used on the warm side (the bottom, incase of ceiling joists) before insulation is placed. Aleveling board (as shown) gives a constant insulationthickness. Thick batt insulation might also be combinedto obtain the desired thickness with the vapor barrieragainst the back face of the ceiling finish. Ceilinginsulation 6 or more inches thick greatly reduces heatloss in the winter and also provides summertimeprotection.Areas around doorframes and window framesbetween the jambs and rough framing members alsorequire insulation. Carefully fill the areas withFigure 5-29.—Precautions in insulating.insulation. Try not to compress the material, which maycause it to lose some of its insulating qualities. Becausethese areas are filled with small sections of insulation, avapor barrier must be used around the openings as wellas over the header above the openings (fig. 5-29,view A). Enveloping the entire wall eliminates the needfor this type of vapor-barrier installation.In 1 1/2- and 2-story structures and in basements,the area at the joist header at the outside walls should beinsulated and protected with a vapor barrier (fig. 5-29,view B). Insulation should be placed behind electrical5-23
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