I am having an extension built, and my builder is constructing the flat warm deck roof in the following way:
GRP
Insulated decking board (Ecotherm insulation 120mm with 6mm ply attached)
Firrings
Joists
Plasterboard
I have read that I need a Vapour barrier. Where in the roof construction should this be installed?
Would the blue DPM used in solid concrete floors be ok as a vapour barrier in the ceiling?
GRP
Insulated decking board (Ecotherm insulation 120mm with 6mm ply attached)
Firrings
Joists
Plasterboard
I have read that I need a Vapour barrier. Where in the roof construction should this be installed?
Would the blue DPM used in solid concrete floors be ok as a vapour barrier in the ceiling?