Hello All! New member. I'm about to order and install a Drolet Deco Nano stove. The cabin has a bare subfloor, can I use a durock 1/2" cement backer board under my 3.75" of concrete for a 4 1/4" total hearth thickness? I could increase the backer thickness by using a thicker backer board or doubling the 1/2" sheet. Or do I have to increase my concrete thickness to 4" alone not counting the backer? Minnesota code is 4" of hearth thickness minimum. Does the backer count as increased thickness or not for insurance purposes? Ive read several other related threads here, but each state has different codes. Any help would be appreciated.
Last edited: