rosinante
Member
- Messages
- 1,302
- Location
- Cornwall England
Right chaps , Iam building a new shed , man cave,.
The plan is to have a roof of 18 mm py with 50 mm polystyrene insulation on top with timber purlins 75 x 50 also to top then to tek screw the box profile steel roofing to those , leaving a 25 mm gap between insulation and underside, Q should I put the tyvek membrane under the insulation or on top of it before fixing the panels? Underneath of the ply will be 100 x 50 rafters.
A similar construction is planned for the walls , Cheers
Chris
The plan is to have a roof of 18 mm py with 50 mm polystyrene insulation on top with timber purlins 75 x 50 also to top then to tek screw the box profile steel roofing to those , leaving a 25 mm gap between insulation and underside, Q should I put the tyvek membrane under the insulation or on top of it before fixing the panels? Underneath of the ply will be 100 x 50 rafters.
A similar construction is planned for the walls , Cheers
Chris