base for concrete slab


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Old 05-12-16, 01:09 PM
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base for concrete slab

Hey guys building a shed on a 10x6 slab

Dug it down 4" and was planning to pack it with 2" of base then a four in slab that wil be 2 in above grade.

Question I have is I pulled up some old 2'x2' patio stones. Under then was a thick vase of limestone sand mix. Can Iuse this as my base? Im a bit concerned because it seems to be more sand than stone. But then Ialso heard that it isn'tmuch of an issue because sand doesn't hold.water?
 
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Old 05-12-16, 04:15 PM
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2" of base isn't close to being enough especially in cold country like Canada. The normal minimum is at least 4". It's hard to tell without looking at it if what you have would be usable or not but my guess would be no because sand does not compact.
 
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Old 05-12-16, 05:18 PM
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https://db.tt/7H7NZCb3

A link to base.
 
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Old 05-12-16, 05:39 PM
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Below is a detail of a typical slab in California. I know it's a little much for a shed but it gives you an idea of the base material under the slab.
Sand cannot be compacted, but it can be screeded and used as a base. The fact that it cannot be compressed makes it a decent base for a slab.


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