So we have an old fireplace and are giving it a full rennovation. We're replacing the ugly hearth with something more modern. We're putting in a wood stove insert and adding a more modern (nicer looking) ledgestone facade around everything.
Step 1 is take out the old hearth. I had asked this question last week about the best way to go about it, and got some great answers. So I bought a masonry bit, drilled a bunch of holes into the concrete and started chiseling a small section of the concrete in chunks. I wanted to see how far down the hearth goes and what subflooring is underneath it. Not knowing any better, my guess was it would go down maybe 2" and run into plywood/wooden subflooring underneath. Well...
Instead we found:
- the concrete hearth is a solid 4" thick
- near the bottom is a lot of brick material (wondering if this might have been used for filler material or to somehow reinforce it?)
- its sitting on top of yet more stone/concrete (foundation?)
I uploaded a YouTube video that hopefully depicts this a little better.
What the heck?! Or, in more formal terms, what is the stone underneath it? Is this a typical concrete hearth installation? I'm assuming I'll need to just keep going and expose the entire stone/concrete foundation underneath it and buy an exceptionally thick slab of hearth stone to replace it, but hopefully its "okay" to add a few layers of plywood to act as a spacer? I just can't imagine how heavy and expensive 4" of hearth stone will be and I'd like to avoid that if at all possible. Thanks for any explanations!