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 cooler months arrive and energy bills start to climb, much of the heat loss in Australian homes happens through small gaps around doors and windows. Sealing these gaps is one of the simplest and most affordable ways to improve comfort and reduce energy use. With a few basic materials and a bit of time, you can make a noticeable difference to your home’s warmth and efficiency.
Why Sealing Makes a Difference
Even tiny draughts can have a big impact. When warm air escapes and cold air seeps in, your heating system has to work harder to maintain a comfortable temperature. This means higher energy consumption and greater greenhouse gas emissions.
Good sealing can:
- Reduce heat loss by up to 10–15% in older homes.
- Improve comfort, by cutting down on draughts and cold spots.
- Lower outside noise, especially in busy urban areas.
- Extend the life of doors and windows by protecting them from moisture and wear.
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How to Check for Draughts
You don’t need special equipment to find leaks – a few simple tests will do:
- Candle test: Hold a lit candle near the edges of a window or door. If the flame flickers, air is moving through a gap.
- Hand test: On a cool day, run your hand along the frame. If you feel a chill, there’s likely a leak.
- 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 Seal
There are several types of sealing 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 install, but they wear out faster.
- Silicone seals – very elastic and ideal for uneven surfaces.
- Brush seals – great for external 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.
Step-by-Step Guide
- Clean the surface. Remove old seals, paint flakes, and dust. Use a scraper and a bit of methylated spirits if needed.
- Measure and cut. Measure the sides to be sealed and cut the strip to length.
- Apply the seal. Most seals 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 smoothly.
- Inspect regularly. Seals wear over time, so check them every year or two and replace if needed.
Extra Tips for Energy Savings
- Seal around the letterbox with a brush strip or internal flap.
- Check the attic hatch – warm air often escapes through the ceiling.
- Use curtains or thermal blinds at night to keep heat in.
- Consider double glazing if your windows are old – it’s a bigger investment but offers major insulation benefits.
- Block unused vents or gaps around air conditioners when not in use.
A Small Effort with Big Results
Sealing doors and windows is a quick, low-cost DIY project that can make your home more comfortable and energy-efficient. It doesn’t require special skills or tools, yet it can noticeably reduce your heating bills and carbon footprint. In a country where energy costs and climate concerns are growing, this simple step is a smart move toward a more sustainable Australian home.
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