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RE: Minimum Reinforcing in CMU

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I apologize for the delay in my thanks.  Things have changed on the project where I have had to do a bit of redesign anyway.  I designed the walls to 8” thick using “strength design” and therefore there isn’t a question about minimum reinforcing with my design.  I see your point with the section reference though.


For those looking at the history of the list I would say that I have been involved, a bit more as a reader than a contributor in answering questions, for probably over 10 years now.  Even though some of the earlier names have dropped out and we don’t see their names as often, it is still a great way to ask and answer questions that we all have at times.  Invaluable  to say the least for “rookies” and also “veterans”.  Even phrasing a question and answering the question or phrasing an opinion is good practice for us all.  I have also made some “list friends” even though not meeting them in person.  I do hope that will happen sometime.


By the way, is anyone going to the steel conference in Phoenix this week?  Hope to see some of you there.


Joe Grill


From: Scott Maxwell [mailto:smaxwell(--nospam--at)]
Sent: Friday, March 27, 2009 4:52 PM
To: seaint(--nospam--at)
Subject: RE: Minimum Reinforcing in CMU


If you are subject to the MJSC (masonry code), then it will kind of depend on which method you use for calcing the wall out...ASD or Strength.  For Strength design, while not a "direct" minimum reinforcement, section (2005 MSJC) is effectively a minimum reinforcement level.  There is no equivalent in the ASD chapter from what I recall (at least in the 2005 edition).


Otherwise, it would only be if the IBC modified it with something (I still have not gotten around to getting a 2006 IBC) or if you fell under prescriptive requirements of the seismic stuff.





Adrian, MI


From: Joseph R. Grill [mailto:jrgrill(--nospam--at)]
Sent: Friday, March 27, 2009 4:44 PM
To: seaint(--nospam--at)
Subject: Minimum Reinforcing in CMU

I am doing a deep  basement wall for a residence in a SDC C.  It appears that the minimum reinforcing of .0020 with .0007 minimum only comes into play when you are in an SDC D.  The basement is a bit much for an 8” CMU wall and the next size in this area that is used is 12” CMU.  I only need #5’s at 24” o.c. in the 12” CMU which is a little less that the .0013 that would be required for the principle reinforcing.  I’m pretty sure I’m o.k. since I am not in an SDC D and in addition I don’t even need to consider seismic for a residence in an SDC C.  Am I missing anything?



Joe Grill


Joseph R. Grill, PE

email: VVEng(--nospam--at)