Do I need a vapour barrier on the ceiling (warm) side of the unconditioned garage in a hot humid climate?
Do I need a vapour barrier on the ceiling (warm) side of the unconditioned garage in a hot humid climate? Garage is below conditioned space.
I am building in a hot humid climate (Bahamas) and I have a lower level Garage that is below an air-conditioned upper level bedroom. The floor structure is PT wood joists with Rockwool insulation in the cavity. On top of the floor joists we have plywood , a water shield membrane and durock board below the ceramic tile floor finish. There will be hot, humid UN conditioned air in the garage. The Entire buiding is built of ICF and roof deck is spray foamed therefore is is quite airtight when doors and windows are closed. Because it is a vacation rental house I expect that the A/c will not be at full capacity and windows and doors will be open much of the time therefore the Delta T will be lower.
Posted Sep 5, 2013 8:08 AM ET
Edited Sep 5, 2013 12:05 PM ET
Other Questions in Energy efficiency and durability