There are different types of black mold. There are the toxic types, and the non-toxic types. Here in Alaska all the mold is of the non-toxic variety. DO NOT USE BLEACH! It causes the spores to release more spores and they go airborne, and the bleach doesn't kill the airborne spores, and the land and start all over. It is a reaction to the chlorine. I have not heard of the dry-ice, but that is a possibility. There are a few other treatments that "encapsulate" the mold allowing the mold to then be removed mechanically. Always wear respiratory protection to the level of what you are protecting against. My dad has been disabled for nearly 20 years due to exposure to iso-cyanide chemicals in Imron automotive paints before much was known about their effect on the respiratory tract. It would be best to, as already stated, start carefully peeling back the damaged sections till you find good wood to attach new wood to. Then rebuild the sections with new wood, sealing the new skin over as you go, then re-insulating, and rebuilding the interior to your specifications. Lots of work, but can be very rewarding.
Good Luck,
Garry
Garry K
Wife + 4 kids
Retired Military Family.... Alway's on the move....
2002 F350 CCSB 5.4 6spd 4x4 in AK
1966 Avion C-10 Truck Camper