I’m building a garage that will be heated to 45-50 degrees. I’ve built the 4′ frost walls from ICF’s with so I have 3 1/4 insulation on either side of the concrete. Think it’s worth it to also insulate under the slab? I live in upstate NY. Thanks!
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Yes. If you plan on spending time out there in the winter.
jt8
"Success is not the key to happiness. Happiness is the key to success." --Albert Schweitzer
Definitely...but use the Styrofoam rated for vehicular traffic. 2" will about do it, on top of 3" compacted sand. After all, what's the point of heating the space only for the heat to drain out thru the floor?
BTW - A vb goes over the foam before the conc.
My thought was that since the foundation walls were so well insulated, and the garage will only be heated to less than 50 degrees, the difference between ground temperature and air temperature would be minimal. If so, it might be like insulating interior walls. Plus, I have to dig out that extra 2' mostly by hand!
In my work as a renovator I have often been asked to convert garages into workshops, studios, or even accommodation. Do the insulation now - if not you, someone else will benefit.
Edited 9/23/2006 11:13 am by piko