Cavity Closer (50-100mm x 2.4m)
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Product Details
A cavity closer (50-100mm x 2.4m) is a rigid strip designed to seal the gap between the inner and outer walls of a cavity wall, typically around window and door openings. It provides insulation to prevent heat loss and acts as a barrier against moisture, drafts, and pests entering through the cavity. This product is essential for meeting building regulations and improving energy efficiency in new builds or extensions. Cavity closers are usually installed as the wall is built or retrofitted, and can be cut to size for a snug fit in the reveal. They are commonly used in both masonry and timber frame constructions wherever a clean, insulated finish is needed around openings.
As of August 2026, PriceNailer data confirms that the cheapest price for Cavity Closer (50-100mm x 2.4m) is £12.60 from Selco across 4 suppliers. Prices have decreased by 58.2% over the last 14 months.
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Frequently Asked Questions
What is a 100mm cavity closer used for?
A 100mm cavity closer is specifically designed for sealing cavity walls with a 100mm gap, typically around window and door openings. It prevents heat loss, moisture ingress, and pest entry while ensuring compliance with building regulations.
Can I cut cavity closer strips to size?
Yes, cavity closers can be easily cut to the required length using a sharp knife or saw. The 2.4m length provides flexibility for most standard openings, and any excess can be trimmed for a precise fit.
When should cavity closers be installed?
Cavity closers are typically installed during the construction phase as the wall is being built around openings. However, they can also be retrofitted in existing properties during renovation work or when replacing windows and doors.
Are 100mm cavity closers suitable for both masonry and timber frame?
Yes, 100mm cavity closers are compatible with both masonry cavity walls and timber frame construction. They provide the same insulation and sealing benefits regardless of the wall construction method.
How many cavity closers do I need per opening?
For a standard window or door opening, you'll typically need enough linear metres to cover the head, sill, and both jambs. Calculate the perimeter of your opening and divide by 2.4m to determine how many strips you need.