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Re:Compressive Strength of Mortar

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Dan,

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 if type N mortar is used.

Nels Roselund
Structural Engineer