What Is It?

Weatherstripping is a durable flexible gasket put in place to make an airtight seal between the exterior door and door frame of an exterior door system, the sash and frame of an operable patio door, the operable glazed component of an exterior door system, or skylights when they are closed. The degree to which an airtight seal is achieved is a function of the type of weatherstripping used and the type of operable system.

Compression sealsCompression seals are seals that can be squeezed tightly together between the moving sash and frame. Generally speaking, they are the most effective kind of seals and are most commonly used on casement windows that are pulled shut by means of two or more latches.  Compression Seal