Draught proofing is the single most cost-effective improvement you can make to an Edinburgh period property — and it’s one of the more tempting DIY jobs around the house. But there’s a meaningful difference between off-the-shelf foam strip from a hardware store and a professionally fitted brushpile system. Here’s an honest breakdown.
What Professional Draught Proofing Actually Involves
A proper sash window draught seal is not a strip of foam glued to the frame. It’s a routed channel machined into the sash itself, into which a pile of 18mm nylon brushpile is pressed and locked. The sash moves smoothly over the pile, compressing it to form an airtight seal — without friction, noise, or obstruction.
This requires the sashes to be removed from the box frame, the channel to be cut on a router bench or in-situ router jig, and the pile to be properly seated and mitred at corners. It cannot be replicated with over-the-counter products.
DIY Options and Their Limitations
The most common DIY draught seal options are self-adhesive foam strips, rubber V-strips, and wiper seals stuck to the staff bead. These can reduce draughts noticeably — especially at the meeting rail — but they have significant limitations: foam compresses and loses its seal within 1–2 years, rubber strips can interfere with smooth sash operation, and none address the full perimeter of both sashes.
More critically, DIY products applied to listed property windows can technically constitute unauthorised alterations if they change the character of the windows — something a reversible professional brushpile system avoids entirely.
Cost Comparison
| Method | Cost | Lifespan | Effectiveness |
|---|---|---|---|
| DIY foam strip | £5–£20 | 1–2 years | Low–medium |
| DIY V-strip rubber | £15–£40 | 3–5 years | Medium |
| Professional 18mm brushpile | £150–£280/window | 15–25 years | High (up to 86% heat loss reduction) |
The Verdict
For a single window where you want a quick temporary fix, a good rubber V-strip at the meeting rail is better than nothing. For Edinburgh period properties — especially listed buildings, tenements with multiple windows, or anywhere you want a lasting result — professional brushpile draught proofing is the only approach that genuinely works. The cost per window recoups in energy savings and comfort within two to three Edinburgh winters.
See our professional draught proofing service → | Full sash window repair overview