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RE: Masonry allowable bearing stress vs. wood brng stress

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Because without observation of the mixing and placing of the mortar, the assumption is that the mortar strength is basically cr*p.

 

I’ve seen mortar that was most definitely weaker than good wood.

 

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Jason Kilgore

Leigh & O'Kane, LLC

Kansas City, Missouri


From: utej(--nospam--at)comcast.net [mailto:utej(--nospam--at)comcast.net]
Sent: Thursday, September 09, 2004 8:21 PM
To: seaint(--nospam--at)seaint.org
Subject: Masonry allowable bearing stress vs. wood brng stress

 

Why is masonry allowable bearing stress much less than wood allowable perpendicular to grain bearing stress?  The 1997 UBC section 2107.2.10 equation 7-23 states Fbr = 0.26f'm and that would be 390 psi for f'm=1500 psi.  Without special inspection the 390 is reduced to 195 psi.  However, perp-to-grain bearing on DF-L is 625 psi.