Flat to pitched roof conversion with GEOM roof windows

17 Jan 2010
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United Kingdom
Currently have a single storey flat roof extension, which I am planning to convert to a sloping pitched roof (from the house), with 2 small GEOM roof windows.

I am confused by all the hot/cold roofing systems and would like to achieve the best result. I will be using roofing membrane under the tiles, rather than felt so I assume this will help with ventilation. Should I just be fitting celotex between the new joists and then plasterboarding over the top or between joists and underneath joists (to prevent cold travelling through joists). Will either of these prevent mould etc....

Has anyone fitted these GEOM centre pvot roof windows before. I have a plastic shim/spacer type thing that appears to fit under one of the window's brackets. Any ideas if this is required???

Thanks guys
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