thanks again!
Ahhh, Poly Iso is Polyisocyanurate. I didn't reason that one out.
Just out of curiosity. I follow the rock wool notes but I'm wondering.... The current boiler runs year round (indirect hot water). I wonder if I just left an 18" space (no insulation or framing) around the flue if that would be OK. Since it's year round operation the block in that area is always "warmed" by the flue so there shouldn't be any issues with condensation and heat loss would be minimal if its just 18" square.
I say this because I'd like to upgrade to a gas boiler (high efficiency likely) so my not need the flue in the near future anyways. This way once it's gone I can just seal it up the way the rest of the walls are.
Ahhh, Poly Iso is Polyisocyanurate. I didn't reason that one out.
Just out of curiosity. I follow the rock wool notes but I'm wondering.... The current boiler runs year round (indirect hot water). I wonder if I just left an 18" space (no insulation or framing) around the flue if that would be OK. Since it's year round operation the block in that area is always "warmed" by the flue so there shouldn't be any issues with condensation and heat loss would be minimal if its just 18" square.
I say this because I'd like to upgrade to a gas boiler (high efficiency likely) so my not need the flue in the near future anyways. This way once it's gone I can just seal it up the way the rest of the walls are.