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Moisture prevention measures

The sill is usually made from a dense weather-resistant timber, with a sloping rebate to shed water. A drip groove on the underside stops water from running back in under the sill.


A diagram showing the cross-section of a sill. A drip groove underneath the sill on the outside stops water running back in on the underside of the sill.
Cross-section of a sill

A diagram showing how flashing is placed around a frame. The flashing is folded down, then the ends are folded up the jambs, and then the inside corners are folded around on to the sides of the frame.
This diagram shows how flashing is placed around the frame

A diagram showing a door frame set into a wall. The frame is fixed to the jamb stud that has already been packed. Packing is placed behind where the lock striker will be located.
This diagram shows a door frame set into a wall