Open Cell Spray Foam over HVAC ducts in unconditioned attic
My contractor insulated our HVAC ducts in an unconditioned & vented attic with open cell spray foam, achieving R-12 value. We live in Zone 6. Is open cell spray foam acceptable, or will I have condensation issues? I’ve attached a
photo of the insulated ductwork.
After questioning the insulation company why they used open cell instead of closed cell, they said “that’s how we insulate ductwork”.
Will this be a problem? The attic is vented. Also, if I need to fix it, what are
my options besides tearing off the ducts and building it all again?
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