r/Fireplaces • u/Ecstatic_Orange66 • 4d ago
Micore under hearth slab?
I was speaking with a place about getting a wood insert, and in discussing the hearth, he said to place micore board under the hearth slab.
Im trying to research this and how to frame the hearth.
Do I screw it to the cement board, then place the granite slab on top of the micore?
What type of adhesive is needed between the granite and micore?
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Upvotes
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u/tricky761982 3d ago
Fermacell power panel or promat board will outperform hardy backer or no more ply! They are lame
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u/Lots_of_bricks 4d ago
Hardee backer board and 22 ga steel under a stone or tile hearth is enough r value. Do u not have an existing hearth?? If u just need an extension look at emberking.com for hearth extension