Monday, July 2, 2007Interior doorframes When ordering prehung doors, you'll need to specify the width of the jamb. Jambs are sized to accommodate standard wall thicknesses. The most common interior jamb width is 4 9/16 in., which fits a 2 x 4 wall with 1/2-in. drywall on both sides, and leaves a little extra room in case the drywall ant tight or the studs are slightly warped. Many exterior walls and some interior walls are framed with 2 x 6s, in which case a 69/6-in. jamb is -required. In remodeling work, oddball wall thick are common. You'll need to specify a custom jamb width or use the nearest standard jamb and then add jamb extensions.
Split jambs consist of two interlocking half jambs. By sliding a half jamb into a groove in the in the edge of the other half jamb, you can adjust the overall jamb width to accommodate variations in wall thicknesses. A built-in doorstop conceals the joint between the two sides of the jamb. To confuse matters, the term split jamb also refers to a different type of jamb used with pocket doors. A head jamb typically fits into dadoes (grooves) cut into the leg jambs. Short sections of leg jambs extending above the head are called horns. Horns lock the head jamb securely in place. In some regions, horns are omitted. Instead of a dado joint, the heads are joined to the legs with a rabbet joint or simply a butt joint. All three types of joints should be reinforced with screws driven through the back of the leg jambs into the head.
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