Type R cavity closer has been specifically designed to create a more waterproof cavity closer system, available in widths of 50mm to 300mm in standard and fire rated versions. Type R comprises two rigid PVC extrusions, one of which has a flexible water seal. Once the window is in place the flexible seal sits against the window frame and acts as a secondary water seal.


This product is suitable for masonry and timber frame walls and offers the following major benefits:

  • Incorporates a Secondary Weather Seal
  • Suitable for First and Second Fix
  • Meets Building Regulations Minimal Thermal Resistance

Type R has been independently tested and certified to the latest Industry Standards, including BDA Kiwa certificate of Agrement.

With product specification, project support, U-value or condensation risk calculations, we at YBS Insulation believe we offer the highest level of support to all of our customers.

Get in touch with our professional team today if you’d like to discuss your insulation needs or if you’d like to order Type R.