I am in the LA area and we have an industural building that has a 24' high celing that has exposed wood rafters and roof joists. The rafters are made with 2'x6' and the gap between the rafters isroughly 2' x 8' in area.
I recently ordered kraft faced R19 batts and FSKF-10 radiant barrier insulation foils
Someone then told me that by having both the foil and the kraft paper batts, I will be creating 2 layers of vapor barriers and this is not a good idea due to the possibility of condensation between the barriers.
Should I use unfaced batts instead so that I only have 1 vapor barrier (ie the foil)?
There is actually no cost difference to me. Either going with faced or unfaced batts is OK with me.
By the way, I do have HVAC in the warehouse, which is operated only when the warehouse has people in it.
Please advice... thanks!