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RE: 50' oc control joints for SOG ok?

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CRSI has a table for minimizing cracks in a retaining wall and I think ACI 350 has a similar guide.  For a 50’ spacing, CRSI indicates about 4.75% Agross.  A retaining wall is likely to go through greater temperature swings than your slab but I think you are light if you want to minimize cracking.


Roger C. Davis




205 N. Dewey St.

Eau Claire, WI 54703

P (715) 832-1605

F (715) 832-7850


-----Original Message-----
From: Haan, Scott M POA [mailto:Scott.M.Haan(--nospam--at)]
Sent: Tuesday, August 16, 2005 4:04 PM
To: seaint(--nospam--at)
Subject: 50' oc control joints for SOG ok?



For a 6” slab on grade is it acceptable to have a 50’ oc control joint spacing for no. 4 @ 18” oc ea way.  I am looking at a tensile stress based on subgrade friction formula that calculates out.