Cavalok is the only manufacturer of BBA-accredited cavity closer systems made from 100% post-consumer recycled PVC-u. The Cavalok product range is widely used for brick/block, steel and timber frame buildings in the new build residential and commercial sectors.

Cavity closers have become a critical and compulsory building component used in many new-build projects to create door and window openings while sealing the cavities and providing a thermal break. The frame forming closer product enables faster and easier installation of windows as well as improved thermal efficiency for the whole building.

Cavalok closers were used to create and close the openings on a variety of wall constructions ranging from 140mm to 175mm cavities with 90mm of insulation. A four-sided closer solution was selected for the project to accommodate a split lintel and provide a ring of continuous insulation around the opening. Cavalok’s comprehensive range of closers can close cavities from 50mm up to 300mm.

The entire Cavalok cavity closer range is manufactured from 100%post-consumer recycled PVC-u, often from old windows. The range includes the Big Blok system for cavities of 125mm and above. There is also a Cavalok system for 50-100mm cavities and a retrofit Trade closer product for installing after the wall is built.

Cavalok’s cavity closers integrate closing of the cavity and DPC into one simple operation. This provides energy saving and enhanced carbon dioxide emission by ensuring a consistent thermal break and secure insulation around the opening.