Minimum Thickness Rigid Foam Sheathing in Zone 4A
specifies a minimum of R3.75 exterior rigid insulation for a 2×6 wall in climate zone 4-Marine to prevent interior condensation. I am in Zone 4A (mixed humid) and NOT “marine”. Does anyone know if this number still applies? And if not, where do I find a more relevant R value?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part