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Last edited 16 May 2019
In relation to doors, on one side, the jamb bears the weight of the door through the hinges (the hinge jamb), whilst on the opposite side, the door latches, deadbolts and so on, when engaged, will usually extend into a recess in the jamb (the lock jamb). It is therefore important to ensure accuracy of the jamb’s plumb (verticality).
Window frames are typically formed by two side jambs, a horizontal cill across the bottom and a horizontal member across the top sometimes referred to as the head jamb or headjamb. On a window, the jambs can be fitted with jamb liners to improve air tightness. As with doors, a casing will generally be used to conceal the joint between the frame and the walls.
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