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Old 01-07-2017, 03:09 PM   #1
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Need help fireplace hearth slab


Not sure what type of material I am dealing with here. But we have a stone e fireplace with a slab out front of the firebox. Apparently sometime before we bought the home someone had some burning logs rolled out and it burned scorched the top of the slab. I tried some masonary fireplace cleaner last night with a scotchbrite pad and it lightened it up but it's still there and the slab where I did this is a little discolored now. I'm not sure what I have here though....Limestone, Sandstone, or concrete? I just went out and bought a 5" Random orbital sander to perhaps try sanding it. I don't know what grit sandpaper to buy or nothing.Then I would think it needs to be sealed also. It looks like it was sealed at one other time. You can see a layer of something good on the top surface. I've added 3 photos. The last one is after I used that cleaner last night and it discolored. Any help would be much appreciated.
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Old 01-07-2017, 03:44 PM   #2
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Re: Need help fireplace hearth slab


I'm guessing that it is sandstone, which is relatively soft and porous. Try warm water and dawn dish so first with a scrub brush, if it is no go, move on to a weak tsp solution. Ron

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Old 01-07-2017, 03:46 PM   #3
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What is tsp solution stand for?
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Old 01-07-2017, 08:19 PM   #4
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Well after the above didn't work. I decided to start sanding. It actually looks 100's better now and I just started with some 80grit. So plan is to do the whole slab with 80 up to 120 and then wipe it down with some water. Let it dry and seal it. What do I need to buy for sealer for Sandstone? Is there a a specific place, product that I should buy or one that someone has worked?
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Old 01-08-2017, 11:42 AM   #5
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Re: Need help fireplace hearth slab


Quote:
Originally Posted by Steves6354 View Post
What is tsp solution stand for?


Trisodium Phosphate
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Old 01-08-2017, 11:50 AM   #6
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Re: Need help fireplace hearth slab


For a sealer try Quikrete Concrete Sealer,

It should work fine.

ED
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Old 01-08-2017, 03:52 PM   #7
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Re: Need help fireplace hearth slab


think i'd choose a mat finish epoxy over any sealer
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Old 01-09-2017, 06:44 PM   #8
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Re: Need help fireplace hearth slab


That certainly looks like Indiana Bedord, which is a very common (and relatively soft) stone. I was going to suggest using an orbital sander (or belt first, if it was really bad), but you already figured it out. Sanding them has gotten us out of a lot of tight spots in the past.
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Old 01-10-2017, 07:49 AM   #9
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Re: Need help fireplace hearth slab


jo', is your ' Indiana Bedord ' what we called ' Amhearst ' ???

no world of conc this year for you ? ? ? me either - every other year's fine

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