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Old 02-06-2010, 09:18 AM   #1
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Insulating Fireplace hearth

My neighbor has a large fireplace hearth made of marble that sits up high. It's a hollow box approximately 1 1/2 tall, 1 1/2 ft deep, and approx. 3 ft wide. It sits above a crawl space. The marble in constantly cold in the winter. They would love to insulate but removing the marble could damage it. We discussed going into the crawl space and drilling a hole under the floor and spraying foam insulation. I'm concerned it could be a potential fire hazard. Any suggestions?


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Old 02-07-2010, 01:12 PM   #2
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Marble is cold. I have a small slab of marble I use as a table top. It always feels cold to the touch no matter where the thermostat is set.

Before tearing stuff up I would find out if the marble is significantly colder than it should be. Many marble finishers have small scraps they will give you as samples. Cheap and easy test: Leave a scrap sitting on it for 24 hours and then see if you can feel a difference in the temps.



Last edited by Blondesense; 02-07-2010 at 01:23 PM.
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