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Old 01-07-2010, 08:13 AM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 21,491
Pete VanderLaan is on a distinguished road
I have a real problem with putting material under something that weighs 2000lbs that is soft like Insblock or fiber. I think it is just asking for a shift off of level. I can see building it with an outer foundation load bearing wall and filling in the central area with better insulating materials, but not ever using them in a load bearing part..

Floors of furnaces are the most neglected part of them. It is a huge face for heat loss and it is never in our consciousness since we can't see it or feel it. It's there. It needs at least eight inches of insulation.
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