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Old 03-15-2011, 12:38 PM   #1
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Shop floor options


I have a 19' by 30' shop that was built on 6 14" sonnotubes. I guess you'd call it a pole barn. It has been sitting there for about 10 years without anything other than the gravel floor, and there is an 8" gap between the bottoms of the walls and the ground as it presently sits.

I'd like to close this gap off and put in a floor, preferably concrete if I can get away with it. If I could build a pressure treated plywood form around the inside wall of the shop, I was thinking that concrete could be poured in it. This would leave a floating slab under the shop. As for closing in the gap around the building, I was thinking of putting pink styrofoam SM between the walls and the ground, then some more pressure treated plywood around the outsides.

Any advice?

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Old 03-15-2011, 01:27 PM   #2
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Shop floor options


So the 8" is where the sonnotubes come out of the ground and support the walls? So an 8" floor draft...chilly.

Pics would be nice.

Concrete is expensive...what do you store in there?

Is there fabric/moisture barrier under the gravel?

With the info I have right now, I'd consider framing the pad outside the sonnotubes, add gravel to shorten the distance to 4" and fill the floor and gap with concrete.

This would allow you to pretty much do anything with that building at that point.

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Old 03-15-2011, 02:19 PM   #3
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Shop floor options


wouldn't there be concerns with frost heaving the foundation around the outside, if there wasn't a 4' frost wall? I haven't checked but I think the sonotubes are 4' deep and built on a pad to prevent frost movement.

If I go with a slab I will definitely be sealing under it with poly prior to pouring it. I use the shop for storage of toys, which often have to be worked on, and I often lose small engine parts in all that gravel...
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Old 03-16-2011, 10:23 AM   #4
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Shop floor options


Toys??? 4 wheelers and tractors and such or cars and trucks?

Is your driveway poured 4 feet deep?

If you heat the inside of that shed, the floor won't freeze on the ouside. You wouldn't have that much sticking out there.

Anyway if you don't put anything too heavy in there, why not build a floating deck system with 2x6s?
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