CMU grout spacing 3

[oldmanadams]

I have a project where the footing rebar was bent over into the incorrect cell for a CMU wall. For instance, the wall is specified to be grouted at 24" on center but is actually 16" one direction and 32" the other. Do you have any opinions on this or sources to review before directing corrective action?

 

[BadgerPE]

Is grouting required at 24" o.c. for structural purposes?

 

[azcats]

Is it cantilevered or a wall that spans b/w roof and foundation?

 

[oldmanadams]

It is a wall that spans between a footing and roof structure. It is load bearing so grouting is required.

 

[jayrod12]

But is grouting at 24" required or is 32" sufficient. If you finessed your loads you might find that at 32" the wall is fine.

 

[concretemasonry]

It sounds like a missed communication between the footing drawings and wall design, since the bars are already there. - Sometimes a quick look back on the loads and assumptions could be valuable, hence the lateral load distributions can vary. Were different engineers involved in the footing and wall designs?

A possibility is using a different f'm for the masonry strength since it is very common for that to be 50% or more greater than is commonly assumed

Dick

Engineer and international traveler interested in construction techniques, problems and proper design.

 

[azcats]

Being a simple span wall, there's likely no stress on that bar coming out of the footing anyway. If it were me, I'd grout the (wrong) cell with the bar above the top of the bar just to utilize is for shear connection b/w wall and footing. Then add a continuous bar in the adjacent, correct cell and work my way up from there. Maybe throw a 180° hook on it if I'm development issues with the embed...but that is unlikely.

 

[TDIengineer]

As azcats suggested, you can always add a bar that isn't lapped to the dowel to assist with out of wall plane bending at the spacing you need. A straight bar will be developed at mispan for a typical 10'-0" wall height. You have your footing dowels as needed for shear transfer.. done and done.