Air sealing windows and doors

  1. Ensure that all the cavity insulation is in place
  2. Fit cavity closer insulation to mitigate thermal bridging
  3. Seal the edges of the insulation and fit the next layer immediately behind the cavity lining.
  4. I used painters caulk to stop air ingress between the frame and the lining board.
  5. Seal any internal corners
  6. Finally fit the lining material, in my case plasterboard
  7. seal to frame with a neat bead of acrylic sealant, here brown is best and on wet plastering a hermetic seal is made between the plasterboard and the blockwork.