Cavity Closer (100-150mm x 2.4m)
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Product Details
Cavity closers (100-150mm x 2.4m) fill the gap in cavity walls around window and door openings, preventing cold bridges, damp and draughts while boosting energy efficiency in home improvements or new builds. This adjustable model suits cavity widths from 100-150mm and comes in 2.4m lengths—perfect for full-height jambs, which you can easily cut to size with a fine-toothed saw. Made with insulated uPVC, it offers thermal performance and often fire resistance for added safety. DIYers fit them by measuring the cavity, inserting into the opening with insulation facing inside, securing with screws or foam, then sealing gaps before installing frames. Use a spirit level for perfect alignment to avoid leaks or misalignment.
Frequently Asked Questions
What cavity widths does the 100-150mm cavity closer fit?
This adjustable cavity closer is designed to fit cavity walls with widths between 100mm and 150mm. The expandable design allows it to accommodate the full range within these dimensions, making it suitable for most standard UK cavity wall constructions.
Can I cut the 2.4m cavity closer to size?
Yes, the 2.4m length can be easily cut to your required size using a fine-toothed saw. This makes it perfect for standard full-height door and window jambs, and you can trim it precisely to fit shorter openings as needed.
How do I install cavity closers around windows and doors?
Measure your cavity width first, then insert the closer into the opening with the insulation facing inwards. Secure it using screws or expanding foam, ensuring it's level with a spirit level. Finally, seal any remaining gaps before fitting your window or door frame.
Are cavity closers fire-rated?
Many cavity closers, including insulated uPVC models, offer fire resistance properties for added safety. However, specific fire ratings vary by manufacturer, so check the product specifications to ensure it meets your building regulations requirements.
What's the difference between cavity closers and cavity wall insulation?
Cavity closers specifically seal the gap around window and door openings to prevent thermal bridging and moisture ingress. Cavity wall insulation fills the entire wall cavity, while closers provide targeted insulation and sealing at vulnerable opening points.