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Re: CMU Site tolerances

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First, I would assume that the commentary of the MSJC is referring to when
you run a masonry wall past a SUPPORTED floor, but no necessarily at grade
level.  But, then I have not taken to time to read the actual passage so I
am speculating purely on what you have said.

The more important thing is that from what you said in your post, it would
appear the tolerance issue is a concrete issue, not a masonry issue.  From
you post, you seem to be saiding that the foundation guy screwed up the
concrete but that masonry guy put the masonry more or less exactly where
it was supposed to go per the plans.  If so, then the beef is potentially
with the concrete.  I say potentially because it then becomes an issue of
what tolerances were required for the concrete per the contract
specifications as ACI 318 does not really provide required tolerances (at
least that I recall).  This means that the contract specs would have to
outline required concrete tolerances, which could be done by referencing
ACI 117.  Thus, you may wish to be careful about suggesting something like
demolition, especially if you were the designing engineer (you did not
really say...but the unintended implication of such was there) since if
concrete tolerances were outlined in the spec the design engineer could be
eating it here.


Ypsilanti, MI

On Thu, 3 Jul 2003, Chris Banbury wrote:

> ACI 530.1-99 3.3G "Specification for Masonry Structures" specifies a maximum 3/4" deviation from the specified dimension indicated in plan view.  However the commentary states that this is not to be applied to situations where masonry extends past floor slabs.  Any suggestions on how to deal with this situation?
> We have been asked to propose remedial action on a single story, partially grouted, reinforced masonry, hip truss roof, 8' ceiling residence, in 120mph exposure B wind zone (currently under construction). In the garage area the base of the wall is nearly 1.5" past the edge of the monolithic concrete foundation for the entire length of the wall (~24').  It appears as if the mason attempted to build the wall to plan over a foundation that was 1.5" too short.  Of course the engineer was not notified until after the contractor failed masonry inspection.
> We've considered modifying the foundation, fully grouting the remaining cells, and of course we have considered recommending demolition.
> Thanx in advance for entertaining the ridiculous.
> Christopher A. Banbury, PE
> Vice President
> Nicholson Engineering Associates, Inc.
> PO Box 12230, Brooksville, FL 34603
> 7468 Horse Lake RD, Brooksville, FL 34601
> (352) 799-0170 (o)         (352) 754-9167 (f)

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