Nearly all lumber dealers carry in stock certain sizes of sash, which are commonly known as "stock sash;" the two sash for a double-hung window form a "stock window." As these stock sash or windows are made in great quantities, they can be made and sold cheaper than custom-made sash (sash made to order), and hence are extensively used in the construction of the cheaper class of buildings, and especially in the smaller cities and towns. The fact that they can be obtained at any time without delay also operates frequently to the selection of stock windows.
Stock sash are not usually as well made as custom-made sash should be, nor are they usually glazed with the best quality of glass, and for these reasons they should not be used in first-class buildings. For many buildings, however, they may be used with reasonable satisfaction, and with a considerable saving in the cost of the building, so that it is well for the average architect to know about them.
* The prices in this table are based on a discount of 80 per cent for plate glass, 60 per cent, for American sheet glass and 50 per cent, for 26 ounce crystal sheet.
The sizes and details of stock windows vary in different localities, and if the architect has occasion to use them he should obtain a catalogue from a lumber dealer, giving the stock sizes carried in that locality.
As a rule, double-hung windows may be obtained with two, four, eight and twelve lights to the window, and in two thicknesses of sash. Two-light windows are generally made for glass sizes from 16x24 inches to 30x40 inches; four-light windows, from 10x20 inches to 15x32 inches; eight-light windows, from 9x12 inches to 14x24 inches, and twelve-light windows, from 8x10 inches to 12x24 inches.
The nominal thickness of stock sash varies in different localities. In the Western and Northwestern States the stock thicknesses are 1 3/8 inch and 1¾ inch, although not all dealers carry the 1¾ inch thickness. In Pennsylvania stock sash are made in 1 ¼ and 1 ½-inch thicknesses, and in Boston four and twelve-light windows are made in 1 ¼-, 13/8 and 1 ½-inch thicknesses, while the two-light and eight-light windows are made only in one thickness, 1 ½ inch. The Western sash generally run about 1/16 inch scant. Almost all stock windows are made for 3/8-inch parting strips.
Cellar sash are usually made in one, two and three lights, the size of the glass generally varying from 7x9 inches to 12x18 inches. These sash are generally made only in one thickness, 1 ¼ inch.
Stock sash are almost invariably sold already glazed, and, as a rule, both single and double-strength windows are carried in stock, but with only one quality of glass. In specifying or ordering stock sash, therefore, it is necessary to specify the number of lights to the window, the size of the lights, the thickness of the sash, and whether single or double-strength glass is wanted.
In the Middle and Western States two-light stock windows are 4 inches wider and 6 inches higher than the width and combined height of the glass, with a slight increase in the width for four, eight and twelve lights. In New England all stock sash are made 3 5/8 inches wider and 5 inches higher than the glass.