Door installers and homeowners add weather seals to block drafts and increase energy efficiency in a home. Threshold weather seals guard against under-the-door drafts. Doorjamb weather seals create a draft barrier at the top and hinge sides of the doors. Often overlooked and left unprotected is the narrow space between the doors where air passes and creates a draft. Double doors have one inactive door with a strip of wood molding, called an astragal that juts out from the stationary door to keep the active door from swinging past the inactive door. Astragals cover the gap between the doors, but offer no protection from drafts.
Things You'll Need
- All-purpose cleaner
- Tape measure
- Compression seal
- Utility knife
- 7/8-inch flat-head screws
- Power screwdriver
Spray a rag with an all-purpose cleaner. Wipe the edge of the inactive door to remove dirt and debris.
Measure the height of the door frame from the floor up where the inactive door sits with a tape measure and note the measurement. Most double doors come in 84- or 96-inch heights.
Unroll the compression seal and cut it with a utility knife to the same length as the height of the door frame.
Position the compression seal along the edge of the door behind the astragal with the top edge of the seal touching the top of the door frame and the bottom edge of the seal touching the floor.
Hold the seal in place or have a helper hold the seal in place.
Place a 7/8-inch flat-head screw 1/2-inch from the top of the door, centered to the edge of the door or as close to center as possible without blocking the door lock.
Drive the screw through the compression seal into the side edge of the door with a power screwdriver. Pull the seal, so it is taut and drive a 7/8-inch flat screw 1/2-inch from the bottom of the door. Drive 7/8-inch flathead screws through the compression seal into the side edge of the door every 12- to 15-inches.
Tips & Warnings
- Consider adding threshold and doorjamb seals to keep all door drafts at bay.
- Do not block the door lock with a compression seal.
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