Door Frames

External doors are fixed to frames. A door frame consists of two vertical pieces (posts) and one horizontal piece at top (head). Sometimes a horizontal member is added at the base also which is called a sill. The size of the members depends on the size of the door to be hung. Generally, they are 120 mm x 75 mm in section. They have a rebate of about 30/35 mm depth wherein the door shutter fits and one groove where the plaster abuts. 

  Details of a Door Frame

The joints between the head and the post may be of any one of the following types

1. Closed mortised and tenoned joint, 
2. Haunched mortised and tenoned joint. 
3. Pin and tenoned joint, and 
4. Double tenoned joint. 

Other types of door frames ma& of metal like steel rolled sections, pressed steel and aluminium are also used. RCC frames have also been used as a wood substitute which is cheaper than metallic frames.