Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: Earth friction on sonotubes

[Subject Prev][Subject Next][Thread Prev][Thread Next]

Everything technical you have written seems reasonable and correct.

I can't comment much on cost because construction costs are VERY site specific. I would expect, however, that the marginal cost difference between the "el cheapo" foundation and a good foundation is likely to be very small compared to the possible cost of correcting problems resulting from a bad foundation design.



On 24/02/2014 11:37 AM, Drew Morris wrote:
Daryl, in Anchorage the minimum depth for cold footings that are part of a structure is 60" (bottom of footing). For isolated foundations (light poles, etc.) and cast-in-place concrete piers it is 120" unless it is non-frost susceptible soils where 60" is allowed. I am concerned about frost jacking and am not sure bout the soils, so will have the sonotubes go down deeper, 6 feet or so. The other option is piles (4 to 5" standard pipe) but the owner is worried about the cost.

On 2/24/2014 8:44 AM, Daryl wrote:

I was about to reply to this line until I read Bill's response and decided that I didn't need to.

The only things not mentioned by Bill are potential frost jacking and minimum depth of cover for frost protection to prevent uplift from frost penetration.

Since Drew posted his question from Alaska I assume that he knows about these things. If not, please ask and I will reply.

Truncated 459 characters in the previous message to save energy.

Post your message to the list by sending it to: SEAINT-SEAOSC(--nospam--at)

The email messages sent to the list will be saved in an archive on the World Wide Web.
These archives are located at:

To contact the list owner, send your message to:

Sponsored By: Pacific Structural & Forensic Engineers Group, Inc. (PSFEG)

To unsubscribe, switch to/from digest, get on/off vacation, or change your email address, click here.