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Re: Earth friction on sonotubes

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Doesn't the Sonotube usually rot out? I've seen something like this also but in metal sheds made out of bent tubing and corrugated sheet metal. The prospective client came to me because his engineer couldn't get this design passed by the local jurisdiction.

Neil Moore, PE, SE
neil moore and associates
consulting structural engineers
shingle springs, california
530 677-4308

On 2/24/2014 8:49 AM, Drew Morris wrote:
I am reviewing the design of a foundation for a small barn for horses, 30' x 36'. The designer is using sonotubes of various diameters with an embed depth of 2'-6". To counter the uplift, the designer is using the self weight and is counting on friction between the sonotube and the earth per IBC 2009 1810.3.3.4. Section 1810 is for deep foundations and would not apply for this setting. The minimum depth for the bottom of the sonotubes as part of a cold footing is 60", so it will be easy to resize the diameter and just use the self weight to counter the uplift.

Drew Morris, PE*| Project Engineer
BBFM Engineers, Inc. <>
510 L Street, Suite 200 | Anchorage, Alaska 99501
Ph: (907)274-2236 | Direct: (907)270-2240 | Web:


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