Hi all,
Tomorrow I'll be insulating and boarding the cheeks of my dormer Windows and wondered if they need dpm between the celotex and osb?
The dormers are osb construction which is then wrapped in breathable roofing membrane and then upvc shiplap cladding.
I'll be using 100m celotex between the batons with 12.5mm plasterboard over the top, I just need to know if I need some visqueen or similar directly against the osb followed by the celotex or if I can place the celotex directly against the osb?
Tomorrow I'll be insulating and boarding the cheeks of my dormer Windows and wondered if they need dpm between the celotex and osb?
The dormers are osb construction which is then wrapped in breathable roofing membrane and then upvc shiplap cladding.
I'll be using 100m celotex between the batons with 12.5mm plasterboard over the top, I just need to know if I need some visqueen or similar directly against the osb followed by the celotex or if I can place the celotex directly against the osb?