Can I do this?

[thinkxingu]

Building a hearth extension that needs R2.5 (Homestead). A nice fellow user has 1/2 sheet of Micore I can have, but it sounds like tile cannot be mounted to Micore.

Can I use:
2-1/2" Micore 300 (1.03)
1-1/2" sheetrock (.45)
1-layer ceramic tile (.002)
Total: 2.512

S

 

[Wet1]

You need a solid subfloor to place the Micore on. I would not use sheetrock above the Micore, it has a combustible surface and offers little rigidity. I'd cover the Micore with two layers of cement board (I believe each layer of 1/2" Durock is R0.26). Bond it all with thinset. This will give you the fire protection and solid foundation for your tile.

 

[thinkxingu]

Wet1,
Are you saying to put 1 sheet Durock on bottom as subfloor, 2 sheets Micore in the middle, 1 sheet Durock on top, and tile on that? Is that the thinnest possible option?

Thanks!

S

 

[wingarcher]

We did durarock, micore, micore, durarock, slate. Each comma was thinset. To make this even thinner, we put it on the subfloor and then installed the 3/4" hardwood around it. It's not much thicker than a commercial hearth pad. Also with a Homestead on it. Skip the drywall.

Nat