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Re: Control Joints in a Mat Foundation

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Title: Re: Control Joints in a Mat Foundation
Bill,

I don't think control joints apply to a structural mat foundation

Tarek Mokhtar, SE
Laguna Beach, CA






I am working on a project which consists of a single story wood framed building sitting on a mat foundation. The mat is 16" thick.
 
A field question has come up regarding control joints. In a typical slab-on-grade, I specify cuts one third the slab thickness spaced no more that 3T feet where "T" is the slab thickness in inches. These recommendations don't make a lot of sense for a 16" "slab".
 
What would be a more appropriate guideline for this situation?
 
TIA,
 
T. William (Bill) Allen, S.E.
ALLEN DESIGNS
Consulting Structural Engineers