Figure 4-23.-Typical double-hung window.provide protection before and after they are placed inlocation. Compression weather stripping, for example,the walls.Insulated glass, used both for stationary and move-able sash, consists of two or more sheets of spaced glasswith hermetically sealed edges. It resists heat loss morethan a single thickness of glass and is often used withouta storm sash.Window frames and sashes should be made from aclear grade of decay-resistant heartwood stock, or fromwood that has been given a preservative treatment.Examples include pine, cedar, cypress, redwood, andspruce.Frames and sashes are also available in metal. Heatloss through metal frames and sash is much greater thanthrough similar wood units. Glass blocks are sometimesused for admitting light in places where transparency orventilation is not required.Windows are available in many types. Each type hasits own advantage. The principal types are double-hung,casement, stationary, awning, and horizontal sliding. Inthis chapter, we’ll cover just the first three.DOUBLE-HUNG WINDOWSThe double-hung window is perhaps the mostfamiliar type of window. It consists of upper and lowersashes (fig. 4-23 detail) that slide vertically in separategrooves in the side jambs or in full-width metal weatherstripping. This type of window provides a maximumface opening for ventilation of one-half the total windowarea. Each sash is provided with springs, balances, orcompression weather stripping to hold it in place in anyprevents air infiltration, provides tension, and acts as acounterbalance. Several types allow the sash to beremoved for easy painting or repair.The jambs (sides and top of the frames) are made ofnominal 1-inch lumber; the width provides for use withdrywall or plastered interior finish. Sills are made fromnominal 2-inch lumber and sloped at about 3 inches in12 inches for good drainage. Wooden sash is normally1 3/8 inches thick. Figure 4-24 shows an assembledwindow stool and apron.Figure 4-24.-Window stool with apron.4-17
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