Though difficult to install, the combination vinyl door bottom and aluminum threshold is longwearing and provides effective weatherproofing. Since the vinyl is mounted in an aluminum extrusion fastened to the door, the aluminum threshold bears the brunt of wear. The only disadvantage in that interior frost may accumulate on the threshold during extremely cold weather. While attractive, this practice must be questioned because of the heat loss or gain. By covering an exterior door with a storm door, conduction loss and infiltration through that door can easily be reduced by 50 percent.
Many people dislike the appearance of the traditional aluminum storm door.
To be sure, these doors are potentially hazardous. However, Missouri law now requires tempered safety glazing in such doors, and attractive decals and appliqu s can be attached at eye level to make sure the glass door is noticed. Garage doors Another large source of infiltration can be found around almost any overhead garage door. Usually available in rubber or vinyl, the bottom is simply cut to measure and nailed to the bottom edge of the door with rust-resistant nails. The final step should be the installation of an overhead garage door weatherstrip kit.