Figure 4-18.-Parts of an exterior doorframe.WoodWood jambs are manufactured in two standardwidths: 5 1/4 inches for lath and plaster and 4 1/2 inchesfor drywall. Jambs may be easily cut to fit walls of anythickness. If the jamb is not wide enough, strips of woodare nailed on the edges to form an extension. Jambs mayalso be custom made to accommodate various wallthicknesses.MetalStandard metal jambs are available for lath andplaster, concrete block, and brick veneer in 4 3/4-, 5 3/4-,6 3/4-, and 8 3/4-inch widths. For drywall construction,the common widths available are 5 1/2 and 5 5/8 inches.The sill is the bottom member in the doorframe. Itis usually made of oak for wear resistance. When softerwood is used for the sill, a metal nosing and wear stripsare generally included.The brick mold or outside casings are designed andinstalled to serve as stops for the screen or combinationdoor. The stops are provided for by the edge of the jamband the exterior casing thickness (fig. 4-1 8).Doorframes can be purchased knocked down(K. D.) or preassembled with just the exterior casing orbrick mold applied. In some cases, they comepreassembled with the door hung in the opening. Whenthe doorframe is assembled on the job, nail the sideFigure 4-19.-Thresholds.Figure 4-20.-Thresholds providing weatherproof seats.4-14
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