Hello lords of fire - I tried to find an answer to this question in past posts but couldn't - so here goes...I am installing a regency 2400 stove in a new (modular) construction - the alcove was built to regency specs for width, height, depth, etc. Now I just have to put some flooring down beneath the stove so I can finish the wood floor up to its 16 inch front clearance, ect. The sub floor is there and I think I can use a standard piece of concrete board and then tile on top of that - I think it is enough for the stove I bought - it has the heat shields, air mate, and all. I don't need a riser beneath the concrete board do I? Does anyone have any suggested brands - suggested thickness? thanks.