I think I have my design for the warm-deck flat roof on my garden office worked out but would like to get some opinions from the various experts here (thanks, all for the great advice so far).
The roof is 6m x 6m, with a suitable slope for run-off.
So, here's what I have so far working upwards:
- Joists (2x3m lengths of 95x45mm C16 supported midway by internal stud wall) @610mm centers to suit...
- 18mm OSB3 (maybe T&G)
- Vapour barrier. Loose fitted, probably stapled at edges to keep it from blowing about while I work.
- 100mm celotex (or equiv if I can find cheaper than Wickes). Each screwed down at corners.
- Wickes Polyester capfelt stuck down with a goodly slap of...
- Wickes trowel-on roofing adhesive.
The instructions on the polyester capfelt calls for polyester roofing underlay, but does anyone think it's relevant for this design? Do you only need that if putting directly onto the decking?
Keen to get this as right as I can as it's not only probably the most expensive part, and the most important part if I want to be cosy and dry in there!
The roof is 6m x 6m, with a suitable slope for run-off.
So, here's what I have so far working upwards:
- Joists (2x3m lengths of 95x45mm C16 supported midway by internal stud wall) @610mm centers to suit...
- 18mm OSB3 (maybe T&G)
- Vapour barrier. Loose fitted, probably stapled at edges to keep it from blowing about while I work.
- 100mm celotex (or equiv if I can find cheaper than Wickes). Each screwed down at corners.
- Wickes Polyester capfelt stuck down with a goodly slap of...
- Wickes trowel-on roofing adhesive.
The instructions on the polyester capfelt calls for polyester roofing underlay, but does anyone think it's relevant for this design? Do you only need that if putting directly onto the decking?
Keen to get this as right as I can as it's not only probably the most expensive part, and the most important part if I want to be cosy and dry in there!