Door Thresholds & Sills
The thresholds inside your house and the sills and thresholds in exterior door-ways are the hardest-working parts of your doors. Because they’re exposed to continual foot traffic and, in the case of exterior doorways, the elements, both may eventually need to be replaced.
The sill forms the bottom of the frame of an exterior doorway and serves the same function as a window
sill it diverts water away from the door and house. The sill fits snugly under the casing and against or under the jambs. Fastened to the sill is a threshold, which helps seal the air space under a door. Thresholds are often used inside as well to make a neat transition between different flooring materials.
Thresholds, also called saddles, are available in either hardwood or metal (usually aluminum). You can also
get special thresholds that act as weatherstripping.
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