How To Fit New Double Glazed Window Seals to SOLVE Cold Draughts, by About the House on YouTube. 8 min 24 s.
- Video length
- 8 min 24 s
- Time to do it
- 45 minutes
- Difficulty
- Easy
- Steps
- 8
What you need
Steps
Run your hand around the window frame and opening to feel for cold draughts. Look for rubber seals that are cracked, flattened, loose or perished.
Measure the old seal and note its profile shape, width and groove size. Cut off a small sample and take it to a supplier if you are unsure.
Buy replacement seal that matches the old profile and groove size. Get enough to run around the full opening, plus a little spare.
Open the window and pull out the old seal by hand. Use a flat scraper for stubborn parts, but take care not to damage the frame.
Clean the empty groove with a cloth and mild soapy water. Remove dirt, old adhesive and loose rubber, then let the groove dry fully.
Press the new seal into the groove at a top corner. Work along the frame in short sections and push the seal fully home without stretching it.
Cut the ends neatly with sharp scissors or a knife. Butt the joins tightly together so there are no gaps at corners or meeting points.
Close the window and check that the seal compresses evenly all round. Run your hand around the frame again and refit any loose sections.
Tips and common mistakes
Warm stiff rubber in a warm room before fitting so it presses into the groove more easily.
Do not stretch the seal as you fit it, because it can shrink back and leave gaps.
Clean the groove well, since dirt stops the new seal sitting flat.
For high windows, use a stable ladder and do not overreach or lean out.
Questions
How can I tell if the rubber seal has failed?
Look for cold draughts, cracked or flattened rubber, loose sections or a window that rattles. Mist inside the glass means the sealed unit has failed, not just the rubber seal.
Can I fit any replacement window seal?
No. The new seal must match the old profile and groove size, or it may not sit properly or keep out draughts.
How long does it take to replace seals?
Allow about 30 to 60 minutes for the first window, then less time as you get used to the process.
This guide was drafted from the video's details and general task knowledge. It has not been checked against the full video. Check the video and relevant product instructions before following a procedure. Report a correction.
