WINDOW WIDTH:
Overall Window Width = Internal Sub-Frame Width - 10mm
FOR A MECHANICALLY JOINTED SUB-FRAME:
MITRE CUT – Sub-Frame Cill Section Overall Width =
Opening Width + 120mm
SQUARE CUT – Sub-Frame Cill Section
Overall Width = Opening Width
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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
outerframe 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.
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