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Re: Compressive Strength of Mortar

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Table 21-D of the 1997 UBC provides relationship requirements between fm, brick strength and mortar type (M, S, of N).  For example, brick units with a compressive strength of 8,000, psi and type S mortar may be combined to provide fm = 3350 psi; the brick units need a strength of 10,000 psi to achieve fm = 3300 psi
Nels Roselund
Structural Engineer
-----Original Message-----
From: Dan Goodrich <dang(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Date: Thursday, December 21, 2000 9:27 AM
Subject: Compressive Strength of Mortar

I'm designing a building using Atlas Brick.  The typical
f`m value is 3000 psi.  My question concerns what
strength to specify for the mortar.  I have heard that as
the mortar strength increases, the bonding between the
mortar and the brick decreases.  So, what strength
mortar should I specify so that I get the strength I need,
but not lose the bonding? 
Dan Goodrich, P.E.