How to Replace Window Weatherstripping

Worn window weatherstripping is the #1 cause of window drafts, noise, and energy loss. Replacing it takes about 30 minutes and immediately improves comfort and efficiency. Here's how to do it correctly.

Signs Your Window Weatherstripping Needs Replacing

• You can feel a draft around the closed window
• The weatherstripping is visibly compressed, cracked, or missing
• Light is visible around the window edges when closed
• The window rattles in the wind
• Your energy bills have increased without other explanation

Types of Window Weatherstripping

• Foam tape: Self-adhesive, easiest to install, compresses over time; replace every 1–2 years
• Pile/brush strip: Self-adhesive strip with a fuzzy pile; ideal for sliding windows; lasts 3–5 years
• V-strip (tension seal): Folded metal or plastic strip; more durable, good for sides of double-hung windows
• Rubber or vinyl bulb seal: Most durable; requires nailing or stapling

What You'll Need

• New weatherstripping
• Scissors or utility knife
• Rubbing alcohol and cloth
• Measuring tape

• Weather Stripping Brush Pile Self-Adhesive 16.5ft (Grey) — designed specifically for sliding windows and doors; pile brush seals irregular gaps perfectly; 16.5ft covers multiple windows
• Foam Weather Stripping Seal Tape 16ft (1/2" x 1/4") — self-adhesive high-density foam; ideal for window stops and frame edges on casement and double-hung windows

Step 1: Remove Old Weatherstripping

Peel off self-adhesive weatherstripping by hand. For stapled or nailed strips, use a flathead screwdriver or pliers. Remove all adhesive residue with rubbing alcohol — new weatherstripping won't adhere to old adhesive.

Step 2: Clean the Surface

Wipe the surface where the new weatherstripping will go with rubbing alcohol. Let dry completely. This is the most important step for adhesion — don't skip it.

Step 3: Measure and Cut

Measure each side of the window where weatherstripping is needed. Cut pieces to length with scissors or a utility knife. For corners, cut at 45 degrees for a tight fit, or butt the pieces together.

Step 4: Apply the Weatherstripping

Peel the backing and press firmly onto the surface. For foam tape, apply to the window stop (the strip the sash closes against). For pile strip on sliding windows, apply to the channel the sash slides in.

Step 5: Test the Window

Close the window and check for drafts with a candle or your hand. The window should close with slight resistance from the compressed weatherstripping. If it's too hard to close, the weatherstripping is too thick — use a thinner profile.

How Much Weatherstripping Do You Need?

A standard double-hung window (36" wide, 48" tall) needs approximately 14 feet of weatherstripping for all four sides of both sashes. A 16-foot roll covers one full window with some to spare.

Maintenance

Check weatherstripping annually. Foam tape typically lasts 1–2 years; pile strip lasts 3–5 years. Replace when compressed, cracked, or when drafts return.