Sealing Doors and Windows – A Simple Way to Reduce Heat Loss and Save Energy
Sealing Doors and Windows – A Simple Way to Reduce Heat Loss and Save Energy
When the cold weather sets in and heating bills start to rise, much of the warmth escaping from a home often does so through small gaps around doors and windows. Sealing these draughts is one of the simplest and most affordable ways to reduce heat loss and improve comfort. With a few materials and a bit of time, you can make a noticeable difference to both your home’s warmth and your energy use.
Why Sealing Makes a Difference
Even tiny gaps can have a big impact. When warm air leaks out and cold air seeps in, your heating system has to work harder to maintain a comfortable temperature. This means higher energy consumption and greater carbon emissions.
Good sealing can:
- Reduce heat loss by up to 10–15% in older homes.
- Improve comfort, as draughts and cold spots are reduced.
- Lower outside noise, especially useful in busy areas.
- Extend the life of doors and windows by protecting them from moisture and wear.
How to Check for Draughts
You don’t need specialist equipment to find where heat is escaping. Try these simple methods:
- Candle test: Hold a lit candle near the edges of a window or door. If the flame flickers, there’s likely a draught.
- Hand test: On a cold day, run your hand along the frame – if you feel a chill, air is getting through.
- Paper test: Close a piece of paper in the door or window. If it slides out easily, the seal isn’t tight enough.
Choosing the Right Draught Seal
There are several types of draught-proofing strips, and the best choice depends on the size of the gap and the material of your door or window.
- Rubber (EPDM) seals – flexible, durable, and suitable for most doors and windows.
- Foam strips – inexpensive and easy to fit, but they don’t last as long.
- Silicone seals – very elastic and ideal for uneven surfaces.
- Brush strips – good for external doors or sliding doors where there’s more movement.
Measure the gap before buying. A seal that’s too thick can stop the door or window from closing properly, while one that’s too thin won’t block the draught effectively.
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Step-by-Step Guide
- Clean the surface. Remove any old seals, paint, or dirt. Use a scraper and a bit of household cleaner if needed.
- Measure and cut. Measure the sides to be sealed and cut the strip to the right length.
- Apply the seal. Most strips have a self-adhesive backing. Press it firmly along the edge, starting from the top and working down.
- Check the fit. Close the door or window to make sure it still shuts easily but feels snug.
- Inspect regularly. Seals wear out over time, so check them every year or two and replace if necessary.
Extra Tips for Saving Energy
- Fit a draught excluder to your letterbox or use an internal flap to stop cold air getting in.
- Seal around the loft hatch, as warm air often escapes upwards.
- Close curtains or thermal blinds at night to keep heat in.
- Consider upgrading to double or triple glazing if your windows are very old – it’s a bigger investment but can greatly improve insulation.
A Small Effort with a Big Impact
Sealing doors and windows is a classic DIY project that pays off quickly. It doesn’t require professional skills or expensive tools, yet it can make a real difference to your comfort and heating costs. It’s also a simple step towards a more energy-efficient and sustainable home – good for your wallet and for the environment.
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