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Door
sub-frame template
When using Cavi-Mate Fire-Stop cavity
closers as door sub-frames, it is recommended (due to the importance of tolerance
in the fixing of doors), that sub-frames are braced at the head and at the centre.
The
tolerance across the width measured at the cill, waist and head needs to be within
2mm (Fig.
1) and within 4mm across the diagonal (Fig. 2). When installing
door sub-frames, constant checks must be made, to ensure
that the frame is built in plumb and square.
Sub-frame assembly
Mechanically Jointd
The mechanical jointing option uses two corner cleats,
which allows the sub-frame to be cut to size and knocked
together with a cleat at each corner.
Please note:
When using this option, the deductions require:
- The cill to be assembled first.
- The frame up-stand (if present) is removed locally
to allow jamb/cill sections to seat properly.
- The frame up-stand of the sub-frame must be notched
back on the horizontal cill sub-frame to allow
jointing at each corner (Detail A).
Once the sub-frame has been jointed, check that:
- The corners are square
- The vertical members are straight
- The sub-frame is flat i.e. not twisted or racked.
As a final check, measure the finished
sub-frame. Internal height and width are correct dimensions,
remembering that the working space between the sub-frame
and the installed window is 5mm, ±2mm each side
(10mm nominal overall).
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