Caroline Hummer

Ok, thank you for your quick reply! So, if we put a sheet of rockboard down on the subfloor, then strips of rockboard and another sheet of rockboard on top (to create airflow) would that work? Would all of that rockboard -which I understand would conduct heat rather than insulate it- draw heat away from our burn and make it cooler?

We are building our first RMH in a bedroom and have run into a few roadblocks. We want to build the J tube on a vermiculite/clay insulating base on top of a sheet of rockboard, which would either rest on the subfloor or replace the subfloor. Is this practical, and safe?