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Old 01-14-2009, 02:24 PM   #1
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Insulating Poured Concrete Foundation


I have a storage room in my basement that has bare poured concrete walls. It is all below grade. Is this worth insulating? If so, what is the best way to do it?

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Old 01-14-2009, 05:16 PM   #2
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Insulating Poured Concrete Foundation


What is the ceiling and what is your intention for the room. Do you want to keep it cold or use it for warm dry storage?

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Old 01-15-2009, 05:44 AM   #3
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Insulating Poured Concrete Foundation


There is no ceiling, just joists. The room will be just storage, but I want to keep as much heat in the house as possible.
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Old 01-15-2009, 06:30 AM   #4
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Insulating Poured Concrete Foundation


In my case I have a slab ceiling under a porch, no joists. I have read that treating the walls outside the room like any other exterior basement wall will isolate it as a cool zone, which is my goal. My space has two vents running into it to provide " cold storage" so I will also insulate and seal the door to reduce draft.
You are in a much warmer zone. Unless you are insulating the entire basement, you could start with sealing the rim joist and sill plate. Then determine if you want to isolate the room. You may prefer to let it breath into the rest of the basement through the joists and just use it like a concrete closet.
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Old 01-15-2009, 01:48 PM   #5
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Insulating Poured Concrete Foundation


If the goal is to keep the heat inside the rooms above, you would want to put insulation in the joists, all the way out to the rim joists. This can be tricky if there are nails penetrating down from the subfloor above.
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Old 01-15-2009, 08:03 PM   #6
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Insulating Poured Concrete Foundation


What are the dimensions of the room?
Does it ever get wet or does it remain dry?
Are your rim joists sealed and insulated?
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Old 01-15-2009, 09:09 PM   #7
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Insulating Poured Concrete Foundation


The room is 7'x14', very dry, and I am in the process of insulating the rim joists with 2" thick extruded polystyrene and will seal with expanding foam. The sill plate is sealed. The concrete walls are on three sides of this room.
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Old 01-16-2009, 09:18 AM   #8
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Insulating Poured Concrete Foundation


Quote:
Originally Posted by sweaty View Post
The room is 7'x14', very dry, and I am in the process of insulating the rim joists with 2" thick extruded polystyrene and will seal with expanding foam. The sill plate is sealed. The concrete walls are on three sides of this room.
Not to impede on the 7' width of your storage area, you could do what I'm considering doing to my own basement. Adhere foamboard directly to the walls and/or floor (can create an insulated subfloor with 1" high density foamboard and 5/8" plywood) caulking and taping all the seams. For fireproofing purposes you could install furring strips right over the top of the foamboard and screwed to the wall. Then throw up some drywall. Otherwise you'll have to construct wall and then insulate the cavities.

Wouldn't take long to put up a few 4'x8' sheets of foamboard and some furring strips possibly 24" OC.

Consider reading this information from the EERE
Best of luck.

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