Adding a hearth to Pier/Beam structure that has plywood subfloor

Hello from Austin Tx. We're redoing our fireplace in travertine and adding a hearth. The complication is the house is on pier/beam and has a plywood subfloor. According to our calculations and using our fireplace literature, we need 4-5 layers of 1/2 inch Durock cement board to meet the fireplace heat barrier recommendations. Is there a different product that has a lower combustibility rating we might find better/easier to use? We've made MANY calls to tile, stone, and fireplace dealers and no one has any ideas.

Thanks for your help. Judy and David

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Apr 02, 2012
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ADDING A HEARTH TO PIER AND BEAM STRUCTURE NEW
by: Charlie Cummins

Hello Judy and Dave I need a little more info. and by the way, you live where the true garden of eden was. Austin Texas. Question, is your existing fireplace a real solid masonry fireplace or pardon the word fake, ---heatalator or ??? In other words does your fireplace have a foundation under it or is it setting on the floor??? I am going to do some guessing and say it is on the floor, OK!! The weight of the Travertine will be transferred to the fireplace, (stuck on) The hearth your want to add on, I will assume is going to be less than 5 inches above the floor, (go higher if you so choose) and I would recommend you use concrete instead of the whatever. Simply form it with wood the height you want it to be, and I would use both concrete reinforcing wire, and also put some 3/8 or 1/2 or 5/8 inch rebar in it to make it extra strong in case you and Judy decide you wanta get on it and dance.
Hope this answered your question, you can learn more by going to my sites, brickcertification.com, and from there you can click on to my other sites which are brickblockstonemasonryconsulting.com or youbethebossbrickblockstonecontractor.com PAY ATTENTION TO THE GUARANTEE or post any question on this great website, or simply call Charlie at 602 692 1896, 24/7 and I will be glad to help you.
Thank you for asking-----Charlie Cummins

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