General requirements

07534 Doors, Windows & Wall Panels
075341 Door frames

Timber door frames shall be produced from specified timber or timber approved by the Engineer complying with Specification 07431. Door frames shall be supplied, assembled unless the supply of knock down forms is approved by the Engineer.

The heads and jambs shall be scribed and framed together with either mortise or tenon or combed joints. Transoms shall be scribed and framed to the jambs with mortise and tenon joints. Door frames shall be rebated as detailed in drawings.
Fan light openings on door frames shall be provided as detailed in drawings.
Glazing beads shall be temporarily pinned in position at the time of delivery.
Door frames shall be notched to receive iron mongery. Notching shall be executed only after the type of iron mongery and notching depth has been determined.
Door frames, unless approved by the Engineer shall be produced from full width timber and in the finished width of the wall. The minimum un-rebated jamb thickness shall be 40mm. Lists to cover joints between frame & wall on either face of frame, shall be milled timber molded architrave not less than 50mm wide.

Assembled door frames shall have temporary diagonals and stretchers.

Door frames shall be screwed to milled timber grounds embedded in masonry. The spacing of ground for jambs and heads shall not be more than 1000mm apart. Door frames may alternately be fixed using steel band cramps screwed or nailed to the back of the frames and embedded in masonry. The distance between cramps shall not exceed 1000mm.