Cavi-Mate Fire Stop Window installation
Window Manufacture
Manufacture the PVC-U window to conventional standards and check overall sizes remembering that the working cavity between the inside of the sub-frame and the outside of the window is 5mm ±2mm per side.

When satisfied that window sizes are correct, screw the jamb clip to the outer frame jamb 150-250mm from each corner and a maximum pitch of 600mm. There should be a minimum 2 clips per jamb member positioned on the outer
frame as shown below:

NOTE: Attention is required when handling the jamb clip – as the serrated edges can be sharp. It is recommended that suitable gloves are used when installing this component.

Cavi-Mate Fire-Stop Sub frame assembly
Sizes and Tolerances
To achieve trouble free window installation it is essential that the sub-frame is manufactured to within the tolerances specified below, that the corners are jointed square and that misalignment of the sub-frame is kept to a minimum both during manufacture and during construction on site. Cavi-Mate Fire Stop has been designed on an installed space between window and sub-frame of 5mm ±2mm per side, and so attention to detail is important. Remember the tolerance of±2mm has to be shared between the sub-frame actual sizes and the window actual size.