insulating concrete wall & ceiling in cold cellar

If you're installing this on the _inside_ of the walls, you have to be _super duper careful_ about flammability concerns. This refers to both the material itself and any fireproofing and cladding.

Thanks for the warning - inside it is. I was hoping to find a product that didn't need to be cladded-over ... perhaps I'm beat before I start ? I recently used a couple small pieces of ROCKWOOL COMFORTBOARD 80 for 2 attic access spots

- it seems benign for fires but 2 inch thick is quite heavy ! and would involve framing .. 1 inch is just R4 .. John T.

The foam materials will be made from a modified material but the code still requires they be covered. They will not burn on their own but will if there is another source of combustion.

I'd use the 4 x 8 sheets putting it up with construction adhesive and then put 3/8 drywall over it.

This is going to be more expensive but will give you some ideas on how to work with the materials

Make sure you put up a good vapor barrier on the outside wall before you put the mold growth media in there. ;) You still might want to dehumidify the cellar. I seem to remember the humidity runs high in there. I haven't had one since 1964. The walls were weeping at times tho.