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dvmbound1977 12-04-2012 09:10 AM

Fireplace Remodel - See Pics
 
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I need to raise the base of the hearth to accomodate my 2cm granite slab. It is about 3.5 inches here now. I hesitate to use wood due to expansion and code regulations. There was sand in this subspace previously. I of course need to make it level before I measure and put in granite.
Once I figure out support underneath, I plan to add hardibacker, thinset and then granite.
The heat from the fire is not a concern since the new vented gas won't get near as hot as a wood burning fireplace, however we left the fireplace so that it could be converted back for any future owners.

Thanks for any help.

BigJim 12-04-2012 10:40 AM

Once you have the support you need just mud it in and level it out good then install.

dvmbound1977 12-04-2012 11:54 AM

Is a wood base okay to support or should I use sand?

BigJim 12-04-2012 09:22 PM

If you use wood be sure to hold it back from the fire box a little. I have see people build right up to the fire box and the house caught fire from the edge of the hearth getting so hot. I know you aren't going to burn wood but someone on down the road might.

You could build within 6 inches or so of the fire box with wood and then use something fire proof the rest of the way. I personally wouldn't use sand as a base because something dropped could cause a crack. JMHO

dvmbound1977 12-06-2012 11:13 AM

I am not in favor of the sand either. I could easily allow for 6 inches around the firebox. Any suggestions for support in that space.

BigJim 12-06-2012 09:48 PM

If it were mine I would build up with wood except for the area at the edge of the fire box, I would build up a mud base to the height of the wood, install a backer board over the wood and mud then make the install.


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