What thickness celotex should I use for a warm flat roof.
Warm Flat Roof Insulation
- Thread starter ANGLER
- Start date
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100mm across the joists (on top) and a further 40mm pushed up tight against the underside (between) from below.
We go a slightly different route than old nose.
To achieve 0.18W/m2K, we find the cheapest and easiest way is 126mm TD4000 celotex across top of joists, mechanically fixed.
Note 126mm TD4000 Celotex. This thickness includes built in VCL and 6mm ply cap bonded to top.
This is suitable for built up felt, but for single ply covering you need an additional 6mm ply on top glued and screwed to comply with single ply covering requirements.
Regards oldun
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