Hi, I need to insulate a cold (utility) room/closet in my basement. It has the house water pump and pressure tank inside, and nothing else. Is there any rigid insulation board _with_ a fire rating that I can put directly on the cinderblock walls? It's a tight space and I can't build a stud and drywal l assembly (for fire rating) as it'll take up too much room. I don't want to insulate the exterior as my neighors all have had termites and carpenter ants, and don't want to provide a habitat for them near my house.
I've read about Thermax, and Roxul rigid boards, but can't seem to find any where in stores (I'm located near New York City). Many thanks for all reco mmenations.
Theodore.