Before You Pay $10,000 for New Windows, Try This Old Italian Trick That Keeps Heat In All Winter, by Enzo Marchetti on YouTube. 13 min 6 s.
- Video length
- 13 min 6 s
- Time to do it
- 2 hours
- Difficulty
- Easy
- Steps
- 9
What you need
Steps
Do the two-minute draft test. On a windy day, hold a lit candle or your hand near the frame edges, sill and meeting rail. Any flicker or cold spot shows where air leaks in.
Check the sill and frame for rot, soft wood or visible gaps. Press a screwdriver into the wood. If it sinks in, fix the rot before sealing anything.
Clean the frame, sill and glass edges with a cloth and degreaser. Sealant and tape stick badly to dust, so let the surface dry fully.
Press rope caulk into the gaps between the sash and frame, and along the sill where you felt drafts. It is temporary and peels off in spring.
Apply weatherstripping to the moving parts: the sides of the sash, the top of the lower sash and the meeting rail. Close the window to check it still latches.
For single-pane windows, fit interior film. Cut the film slightly larger than the glass, tape it to the frame, then shrink it tight with a hair dryer on low.
Seal exterior gaps around the frame with exterior caulk, but leave the small weep holes at the bottom clear so water can drain.
Check storm windows. Make sure they close fully and their seals are intact. Loose or cracked storm panels let cold in and should be repaired or removed.
Retest with the candle after sealing. If drafts remain at the frame itself, the gap may need a pro, and only then think about replacement.
Tips and common mistakes
Seal the frame and seal first, not the glass. Most heat loss happens at the edges, not through the pane.
Do not caulk a window shut if you need it for escape or ventilation. Use removable rope caulk there.
Film works best on a dry, clean frame. Trapped moisture behind it can cause mould.
If you smell gas or see damaged wiring near a window, stop and call a licensed pro.
Questions
Will rope caulk damage my paint or frame?
No. Rope caulk is designed to peel off in spring. Pull it slowly and wipe any residue with a damp cloth.
Can I use interior film on double-pane windows?
It is meant for single-pane windows. On double glazing, trapped heat can stress the seals, so check the manufacturer's guidance first.
How do I know if I really need new windows?
If the glass is intact and the frame is sound, sealing the gaps usually fixes the drafts. Replacement makes sense when frames are rotten or glass is cracked.
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.
