A
andyf82
Hi I'm looking to spec a flat roof with insulation between the new joists. I've come up with the following from top to bottom:
EPDM sheet
19mm WBP ply
Firrings (75mm max down to 25mm min)
150x50mm strength class C24 joists @ 600mm c/s
100mm Kingspan K7 insulation between joists with 50mm air gap over
Vapour control layer
32.5mm K18 insulated plasterboard
Can anyone advise if seems ok or if there is a better way to do it? I cant insulate over the new joists for lack-of-height reasons.
EPDM sheet
19mm WBP ply
Firrings (75mm max down to 25mm min)
150x50mm strength class C24 joists @ 600mm c/s
100mm Kingspan K7 insulation between joists with 50mm air gap over
Vapour control layer
32.5mm K18 insulated plasterboard
Can anyone advise if seems ok or if there is a better way to do it? I cant insulate over the new joists for lack-of-height reasons.