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Old 03-31-2011, 03:04 PM   #1
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Need advice for cement slab/hearth.


Hi,
I am renovating an old fireplace and hearth. After much demoing and rebuilding and almost being done I am left with a 5'2" X 26" concrete slab in front of the fireplace that was probably part of the original hearth. This was underneath the hearth which I removed.
My question is this. The slab is anywhere from 1/4 of an inch to 1/2 inch below the subfloor that surrounds it. What method should I use to build up the slab to make it flush with the sub-floor and suitable for laying tile.
Thanks,
Steve
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Old 03-31-2011, 03:22 PM   #2
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Need advice for cement slab/hearth.


If there are no gaps bween the subfloor and hearth, I would pour floor leveler on top and use the subfloor as my screed guide.
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Old 03-31-2011, 03:58 PM   #3
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Need advice for cement slab/hearth.


Quote:
Originally Posted by CplDevilDog View Post
If there are no gaps bween the subfloor and hearth, I would pour floor leveler on top and use the subfloor as my screed guide.
Thanks for the quick reply.
There is one gap that I suppose I could fill with caulk.
Also, are you talking about a self-leveling compound? Where you just pour it and it levels itself. Can it be worked with a screed like cement? As you can tell I have never used it before. I also thought of the idea of using the subfloor as a screed guide. And although not noticeable with the naked eye the subfloor is probably about a 1/4 of and inch lower on one side of the slab, so I worry that a self-leveler wouldn't come up flush on all sides of the sub-floor.
Thanks again,
Steve K.
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Old 04-09-2011, 11:25 AM   #4
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Need advice for cement slab/hearth.


build a wooden frame around area. prime concrete with latex primer. pour slc. may be helpful to make reference marks on frame to know where you need to be after pouring. let slc dry then remove frame. if possible attach frame to floor. (if poosible)
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Old 04-10-2011, 11:24 AM   #5
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Need advice for cement slab/hearth.


I followed the advice from this topic and followed the instructions to a "T" on the SLC and it came out great!
My follow up question is this:
The original hearth (cement slab) is 5'5" X 2'6". I want to lay the new hearth with 1'x1' tile. Because I want the Mantle to rest on the tile I need to to make the hearth 6'x2'. That means the 2 tiles on each edge of the hearth will be going over about 3 inches onto the plywood subfloor. Is this acceptable? Or do I need to do something to avoid problems in the future. My thinking is that it is such a small area that will receive little if no foot traffic it shouldn't be a problem.
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