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Insulation Strips: Your essential buying guide
Insulation strips are used to help seal gaps where air can pass through, most commonly around doors, window frames, loft hatches and similar edges. They can reduce draughts, improve comfort and help create a neater seal between surfaces.
Measure the gap you need to seal before comparing products. A strip that is too thin may not make contact, while one that is too thick can stop a door or window closing properly. Look for strip dimensions and any stated suitable gap range.
Self-adhesive strips are usually designed for straightforward DIY fitting, but preparation matters. The surface should be clean, dry and free from loose paint, dust or grease so the adhesive can bond properly.
Foam strips are useful for light compression on smaller gaps, rubber or EPDM-style strips can suit areas with more regular opening and closing, and brush strips are often used where a sliding or sweeping seal is needed. Match the material to the gap, movement and exposure.
Some insulation strips are suitable for external doors or exposed areas, while others are intended for indoor use only. Check the product details for weather resistance, temperature suitability and the type of surface it can be applied to.
Insulation strips can look similar, but small differences in size, material and fixing method affect how well they suit a particular gap. Use the points below to narrow down the right option for your project.
Before comparing insulation strips, measure the width and depth of the gap in a few places. Older doors and windows may not be perfectly even, so check both the tightest and widest points.
Choose a strip that compresses enough to form a seal without forcing the door or window out of alignment. If the gap varies, a more flexible profile may be easier to work with.
Foam insulation strips are often used for lighter-duty draught sealing, especially where the surface is reasonably clean and even. Rubber-style strips can be better suited to repeated compression, such as on frequently opened doors.
Brush strips may suit uneven thresholds or sliding areas where a flexible sweep is needed. For damp or exposed positions, check whether the strip is described as weather-resistant.
Self-adhesive insulation strips are popular for quick fitting, but they rely on good surface preparation. Clean the area thoroughly and allow it to dry before applying the strip.
Some strips may use pins, screws or slide-in channels instead. These can be worth considering where adhesive may struggle, such as rough timber, textured frames or high-use areas.
Areas that open and close often need a strip that can recover its shape after compression. A strip that flattens too easily may stop sealing effectively over time.
For doors, check that the strip will not catch on the floor, hinges or locking points. For windows, make sure the seal does not prevent the latch from closing securely.
Insulation strips are commonly available in neutral colours such as white, brown, black or grey. Choosing a colour close to the frame or door can help the finished job look tidier.
Also compare strip length and pack size so you have enough for the full perimeter, with a little allowance for trimming and mistakes.
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