What is Close-R Checked?

An insulated cavity closer, such as Close-R Checked, is a high-performance building product designed to seal and insulate wall cavities around window and door openings in masonry construction.  Including Cavity closers in your build help to prevent thermal bridging, moisture ingress, air leakage and condensation, helping to improve a building’s energy efficiency, airtightness, and long-term durability. A Checked Close-R insulation piece is specially designed to incorporate a pre-formed rebate (or “check”) to accommodate window and door frames. This design ensures a secure fit, improved airtight seal, and improved thermal performance around openings, making installation faster and more precise for builders and contractors