Fitting Requirements
Brick up to sill height, cut and fit the sill closer. Cut the jamb lengths 75mm oversize and trim the flanges back to allow them to overlap the sill closer once fitted.
Continue to brick up the wall, securing all pieces of the cavity closer by plugging and screwing through the larger flange into the internal leaf.
Certifications
Warrington Fire - G249 Cavity Closer - Test Report No. 134212.pdf
Regulations & Standards
BS 5250:2011 Control of condensation in buildings.
Approved Document L1 & L2:
Conservation of fuel and power.
NHBC Technical Guidance 6.7:
Doors, Windows & Glazing
BRE Digest Report 262: Thermal Insulation: Avoiding Risks.
BRE Information Paper IP 1/06: Thermal Bridging at Junctions & Openings