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RE: Masonry questions

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Scott,

Many thanks.

Mark Geoghegan
Honolulu, HAWAII

             > -----Original Message-----
             > From: Scott Maxwell [mailto:smaxwell(--nospam--at)engin.umich.edu]
             > Sent: Thursday, March 13, 2003 11:04 AM
             > To: seaint(--nospam--at)seaint.org
             > Subject: RE: Masonry questions
             >
             >
             > Mark,
             >
             > I am there with you.  I usually have to go back and
             > re-look up what the
             > various mortar types are each time I do a masonry
             > project.  I can't always
             > recall which types are best for which conditions.
             >
             > It looks like you have what you were looking for.
             > If I get anything else
             > from the person I contacted at NCMA, I will let you know.
             >
             > Scott
             > Ypsilanti, MI
             >
             >
             > On Wed, 12 Mar 2003, Mark Geoghegan wrote:
             >
             > > Scott,
             > >
             > > Many thanks.
             > >
             > > 1.	You got it - it was "SW", "MW" and "NW" -
             > the brick weathering grade. "S"
             > > for severe, "M" for moderate and "N" for
             > negligible. "W" for weathering. I
             > > got all confused with FBX, RN, M and other masonry
             > nomenclature.
             > >
             > > 2.	I found a note in the Masonry Institute of
             > America text entitled
             > > "Informational Guide to Grouting Masonry" where it
             > states for multiwythe
             > > walls using high lift grouting at least 3 day cure
             > for warm weather and 5
             > > days for cold weather prior to grouting, and 12-18
             > hour delay for low lift
             > > grouting techniques.
             > >
             > > Thanks - you were a big help.
             > >
             > > Mark Geoghegan
             > > Honolulu, HAWAII
             > >
             > >              > -----Original Message-----
             > >              > From: Scott Maxwell
             > [mailto:smaxwell(--nospam--at)engin.umich.edu]
             > >              > Sent: Wednesday, March 12, 2003 9:07 PM
             > >              > To: seaint(--nospam--at)seaint.org
             > >              > Subject: Re: Masonry questions
             > >              >
             > >              >
             > >              > Mark,
             > >              >
             > >              > I did not find anything in any of my masonry
             > >              > publications on "RX", "RS",
             > >              > or "WX" units.  The only thing I
             > found was a grade
             > >              > "SW", "MW" or "NW" for
             > >              > clay bricks (the first two also
             > apply to calcium
             > >              > silicate bricks too).
             > >              > You could try calling NCMA and asking them.
             > >              >
             > >              > As to grouting the collar joints in
             > a multiwythe
             > >              > wall, I like you could
             > >              > not find anything in the UBC.  I
             > could not find
             > >              > anything in the MSJC, but
             > >              > might have missed it.  I did find a
             > general warning
             > >              > in one text book
             > >              > (Masonry Design and Detailing by
             > Beall) to make sure
             > >              > that your mortar
             > >              > joints have had enough time to cure
             > enough so that
             > >              > pressure from the grout
             > >              > in the collar joint could not
             > "bulge" the wall out
             > >              > due to the mortar
             > >              > joints being too weak.
             > >              >
             > >              > I am checking with someone smarter
             > than me (at least
             > >              > one of the many who
             > >              > are smarter than me).  If find
             > anything out, I will
             > >              > let you know.
             > >              >
             > >              > HTH (at least some),
             > >              >
             > >              > Scott
             > >              > Ypsilanti, MI
             > >              >
             > >              >
             > >              > On Wed, 12 Mar 2003, Mark Geoghegan wrote:
             > >              >
             > >              > > List,
             > >              > >
             > >              > > Seed some assistance with two
             > masonry questions:
             > >              > >
             > >              > > 1.	What is the minimum cure
             > period/duration
             > >              > for the mortar joints of double
             > >              > > wythe masonry walls BEFORE the
             > cavity is solid
             > >              > grouted? I believe UBC 1997
             > >              > > address this but I cannot find it.
             > >              > >
             > >              > >
             > >              > > 2.	Has anybody heard of "RX"
             > or "RS" or "WX"
             > >              > masonry brick units? I may have
             > >              > > the terms incorrect - pretty sure
             > I do - but I can
             > >              > find no texts that refer
             > >              > > to the units in this way. I have
             > found mortar
             > >              > referred to using "RM" etc for
             > >              > > ready mixed type M, but I am
             > interested in the
             > >              > units themselves. Apparently
             > >              > > the terminology is for interior
             > masonry applications.
             > >              > >
             > >              > > TIA
             > >              > >
             > >              > > Mark Geoghegan
             > >              > > Honolulu, HAWAII
             > >              > >
             > >              > >
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