BigBlok: super-insulating cavity closers for 125-300mm cavities

BigBlok - The sustainable system for low-carbon projects
BigBlok cavity closers have been developed to meet the demand for closures in buildings with cavities from 125mm to 300mm wide. Larger cavities that can accommodate more insulation are increasingly being specified on new-build properties to meet stringent thermal efficiency regulations and the requirements of the Code for Sustainable Homes.

Super-insulating, easy-fit, versatile cavity closer
The BigBlok cavity closer comprises a solid block of insulation making it ideal for low U-value construction. The simple slot-together system means you can quickly and cost-effectively close off window and door openings of any size in any type of wall.

The PVC-U cavity closer prevents thermal bridging and provides a brick-laying template. BigBlok cavity closers are compatible with all PVC-U, wood, steel and composite window and door types.