15 minute thermal barrier
I have had 3″ of Bayseal Closed cell foam sprayed into the exterior walls of my cabin. My intention was to apply 3/4″ interlocking car siding over the insulation but our building inspector is suggesting it does not satisfy the 15 minute thermal barrier required. Does anyone have any information on this? I could use 1/2″ drywall over the top or spray with a retardant but I’d rather not. If I use a retardant, any suggestions?
Let me know
GBA Detail Library
A collection of one thousand construction details organized by climate and house part