Vapour barrier / Breathable membrane

Thesearcher

Registered User
Messages
56
Hello,
I have a SIPS structure built and I'm putting 25 mm lats inside with plasterboard over the lats. Do I need a Vapour barrier / Breathable membrane in between the plasterboard and SIPs structure on the inside of the building? SIPS Structure is 175mm.
Thanks
 
whats the makeup of the sips from outside to inside
There will be cement board on the outside of the building over lats and a breathable membrane on the exterior of the external sip panel. The SIPs itself is 175mm OSB on both sides of the insulation.
Thanks
 
ideally you need a wind barrier on the external face as I assume you are just using the CB as a rain shield, with vents top and bottom?
Yes re the vapour barrier on the inside face.
Are you using the space behind as a service cavity, if so maybe make it a bit bigger
 
Back
Top