Air Gap Beneath Roof Sheathing
I am building a tiny house and have an unvented gable roof with 5/8″ ZIP sheathing above 2×6 rafters. I am planning to use Rockwool Comfort Batt insulation, but haven’t found a definitive answer on whether or not I need to leave an air gap underneath the roof assembly. If an air gap is needed, I will need to fur out the rafters 1/2″ to 3/4″. I am in climate zone 2/3 so not worried about a heavy snow load or typical northern climate issues.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part