Weatherstripping is the compressible sealing material that runs along the edges of operable window sashes (and door frames) to create an airtight, weather-resistant closure when the window is shut. It is one of the most cost-effective home improvement upgrades available, with a typical payback period under two years through energy savings.
Types of Window Weatherstripping
- V-strip (tension seal) — durable plastic or metal strip folded into a V-shape; installs into the channel along the side jambs of double-hung windows. Long-lasting and effective.
- Foam tape — adhesive-backed open- or closed-cell foam; easy DIY install, but compresses permanently and needs replacement every 2–3 years.
- Door sweep / pile weatherstrip — brush-pile material used along sliding window rails; low friction, long-lasting.
- EPDM rubber gasket — factory-installed on modern windows; very durable but difficult to replace DIY.
Signs You Need New Weatherstripping
- Visible daylight around closed window sash
- Cold drafts near windows in winter
- Higher than normal heating/cooling bills
- Weatherstripping that is cracked, brittle, or compressed flat
How to Replace Weatherstripping
Most V-strip and foam tape weatherstripping is a DIY-friendly repair. Remove the old material, clean the channel thoroughly, and press or nail the new strip into place. Professional replacement is recommended for EPDM gaskets factory-integrated into the sash or frame.
