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Old 09-19-2009, 11:03 AM   #1
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Insulating walls for heated garage


Hi there - I have run into a bit of a problem in building our cottage. We have built a wooden walls for our crawl space and for the support walls in the garage. The wooden support walls in the garage are 7 feet tall. The cabin is framed and the backfilling is done on the outside cover off the whole 7 feet. On the inside of the garage only 4 ft backfilling is done with another 2 feet to be backfilled. My problem is that the framers have framed the walls without putting insulation in. The garage will be heated. Do I need insulation in those walls? I was hoping I could put rigid insulation on the exposed 3 feet on the inside - will that work? Thanks for the help.

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Old 09-19-2009, 11:18 AM   #2
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Insulating walls for heated garage


If you put rigid insulation on the walls, you will need to cover them with sheetrock as they are flammable.
A little confused on the back filling scenario. Did they back fill dirt against wood walls?
Ron

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Old 09-19-2009, 11:25 AM   #3
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Insulating walls for heated garage


Hi Ron - yes they back filled the dirt against the wood walls. Instead of using concrete for the walls we used pressure treated lumber.
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Old 09-19-2009, 12:07 PM   #4
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Insulating walls for heated garage


I'm also a little confused
I have seen PT timbers used to build a foundation for cabins
What kind of PT was used?

You say 7' garage walls.......then inside 4' backfilled, with another 2' to go?
That leaves 1' of space?

Do you have a picture?
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Old 09-19-2009, 12:48 PM   #5
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Insulating walls for heated garage


Quote:
Originally Posted by Scuba_Dave View Post
I'm also a little confused
I have seen PT timbers used to build a foundation for cabins
What kind of PT was used?

You say 7' garage walls.......then inside 4' backfilled, with another 2' to go?
That leaves 1' of space?

Do you have a picture?
Sorry I am probably doing a real bad job of explaining. I do not have a picture but I am heading up there on Wednesday and can take one then.

The lumber used was PWF 2 x 8's.

The back fill on the inside of the garage is 1' approx. down. There is the garage slap to go in but that is not happening until next spring. When the slab is in it will still be down approx. 4-6 inches from the top of the 7' wall on the inside. Hope that makes sense. It still leaves to question what to do with that remaining 6 inches that will be exposed on that wall and how much heat loss there will be without insulation. I am not sure what to do.
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Old 09-19-2009, 01:54 PM   #6
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Insulating walls for heated garage


I've done some all-wood foundations, but not 7' high. With the access you have, I would use some shredded foam insulation in the full walls, if you really need it. Did you insulate the house crawl wall top 1/2 of wood foundation? If trying to frost-proof it or keep from heaving, just install some rigid foam board under the topsoil at the foundation's perimeter: http://www.oikos.com/esb/43/foundations.html
You could rip some strips of foam board at the slabs perimeter and install before pouring, you need a thermal break there anyhow. Install them wide enough to be covered by the gravel, plastic v.b. and slab. Snap lines on them for slab grade, cut off excess later. If the inside ply is installed, add some foam pieces to fit between studs on the bottom plate. Also, if the garage is heated as it sounds, install 2" foam boards around perimeter laying flat, under the slab, like a slab on grade requirement.
Be safe, Gary

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