Old 10-19-2008, 07:27 AM
Join Date: Aug 2008
Location: connecticut
Posts: 37
Default 2 x 4's inside the hearth slab

While building the hearth slab , I left a 2x4 inside the slab. It is now inside the slab (covered by concrete). Will this compromise the slab, since it is of a different material (with possibly different expansion coefficient?)
Thank You!
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Old 10-19-2008, 08:49 AM
Join Date: Jun 2008
Location: Missouri, USA
Posts: 11
Default Re: 2 x 4's inside the hearth slab

Only if the wood gets wet. Wood fibers will expand with great force if enough water gets to the wood. Since it is burried in the slab, it should be sealed off from water enough so it should not expand enough to break your slab. Even if it does crack, your stand will cover it up and should not matter. On the bright side, when you poured your concrete the boards should have absorbed as much water as they ever will from the concrete itself. This being true, the boards should only shrink with time. You should be safe, Good luck and Good building.
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