I’m going to be using Roxul Comfortboard IS to build 4″ (R16) on the exterior of the north wall of our home. I didn’t want to use XPS (like I have in the past) because of the embedded green house gases.
I’m going to continue 2″ (R8) of this below grade down to the footing.
Roxul have already confirmed that Comfortboard is okay for below grade and it is easier to source than ordering Comfortboard and Drainboard.
I would like to use Grace Bituthene against the foundation wall. But then I don’t see how I can fit the Comfortboard over it, as I’m not aware of a glue that’s allow on the Grace membrane and I don’t want to put nails or other mechanical penetrations. So I might have to water proof with a liquid Asphalt coating which will double as a sealer for the wall and a glue for the Comfortboard.
Any suggestions about how I could use both Grace membrane and the Roxul Comfortboard.
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