How to Install Window Weatherstripping

By +Don Vandervort, HomeTips

Nearly all types of weatherstripping come with instructions for installation, which usually is a breeze.

Pliable-gasket weatherstripping has a self-adhesive backing—you just cut it to fit, using a utility knife, and fit it to the window stop so the sash presses lightly against it.

Felt strips are easy to cut with a utility knife. You fasten them to windows with nails or glue unless they are already backed with adhesive.

Before installing new weatherstripping, remove the old, clean the area, and remove any flaking paint. On a double-hung window, make sure the window lock is pulling the two sashes tightly together. If it isn’t, tighten, reposition, or replace the sash lock.

Spring-style weatherstripping is a little trickier. To install it on a double-hung window, you will need tin snips, a hammer, long-nose pliers, nails, and a putty knife. Here’s how:

weatherstrip-install-011) Measure the height of the sash and cut the metal spring strips 2 inches longer using tin snips.

2) Open the sash and slide the stripping into the sash channel, as shown at left.

3) Hold the nails with the long-nose pliers and hammer them in.


4) Trim the stripping to fit around the pulleys and balances.


5) After installing the strips, pry them open with the putty knife, as shown at right. The spring will stick out more and help complete the weather seal.

6) Cut three strips to fit horizontally across the window. One goes along the bottom of the lower sash with its nailing flange flush along the inside edge of the window. The second attaches to the top of the upper sash. And the third attaches to the bottom face of the upper sash so it seals the two sashes when the window is closed.

Copyright © 1997-2012, Don Vandervort, HomeTips, LLC. All rights reserved. Reproduction without permission is prohibited.




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