Weatherstripping Your Doors and Windows the Right Way

Move a lighted stick of incense or a thin strip of tissue paper slowly around each door and window frame on a breezy day. Any flutter or smoke deviation reveals air infiltration. Note which sides of the frame are affected — top, sides (called the jambs), or bottom — because each location may call for a different weatherstripping type.

Match the material to its location and wear level:

• V-strip (tension seal): Durable plastic or metal folded into a V-shape. Ideal for the sides of double-hung windows and door jambs. It springs open to fill gaps and handles repeated friction well.
• Foam tape: Self-adhesive closed-cell foam. Best for irregular gaps on window sashes and door stops. Low cost, but compresses over time and typically lasts two to five years.
• Door sweeps: Aluminum or stainless bar with a rubber or brush insert, screwed to the interior bottom of exterior doors. Essential for sealing the floor gap.
• Rope caulk: A removable, putty-like cord pressed into gaps — useful for sealed-shut storm windows in winter but not appropriate for operable doors.

Peel away adhesive-backed foam or tape carefully. Use a putty knife to lift stubborn sections, working at a shallow angle to avoid gouging the frame. Residual adhesive can be softened with isopropyl alcohol or a small amount of adhesive remover, then wiped clean. For nailed-in V-strip, remove finishing nails with pliers and pull the strip free.

Once stripped, wipe the entire surface with isopropyl alcohol or mild detergent and allow it to dry fully — at least 15 minutes — before applying anything new. Adhesive bonds poorly to dusty, oily, or damp surfaces.

Measure each side of the door or window frame individually — frames are often not perfectly square, so the top may differ slightly from the bottom. Add about 5% extra length when cutting foam tape or V-strip to ensure full corner coverage. For door sweeps, measure the door width exactly and cut to match using a hacksaw or tin snips if metal cutting is required.

For corner joints on V-strip, cut the end of each piece at a 45-degree angle so pieces meet cleanly without leaving a gap.

Foam tape: Starting at one corner, peel back a few inches of backing and press firmly against the door stop or frame, working your way around without stretching the foam. Stretched foam retracts over time and creates gaps.

V-strip: Open the V slightly with your fingers, then slide it into the channel on the window sash or tack it to the door jamb with finishing nails every 2 inches. The open end of the V should face outward toward the exterior.

Door sweep: Hold the sweep against the closed door so the rubber just contacts the threshold without dragging. Mark the screw holes, drill pilot holes, and fasten the sweep with the provided screws.

Close the door or window and repeat your original draft test — incense, tissue paper, or the dollar-bill method. Pay particular attention to corners and the junction where two weatherstripping pieces meet. If you still detect airflow, press the existing strip more firmly onto the surface, or layer a thin bead of foam tape at persistent gaps. Allow adhesive-backed materials at least one hour to cure before heavy use.