Measure and Cut New Weatherstrip (Side 1)

What happens here

Lay the new weatherstrip alongside the old one to mark the correct length. If the old strip is broken or not usable, measure the length of the door jamb directly. The new weatherstrip typically has a flexible rubber/vinyl flap and a rigid plastic/vinyl base. First, use a utility knife to score and cleanly cut the flexible rubber portion. Then, use a circular saw to cut through the rigid plastic/vinyl base at the marked length, ensuring a straight, precise cut.

Goal: Measure the new weatherstrip using the old one as a guide, then precisely cut the rubber flap with a knife and the plastic strip with a saw.