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RE: Masonry lap length

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From: "Scott Maxwell" <smaxwell(--nospam--at)umich.edu>
To: <seaint(--nospam--at)seaint.org>
Subject: RE: Masonry lap length

>>2" cover would be about the bare minimum allowable cover...considering
>typical 1 1/4" face shell thickness and a minimum of 1/4" clear for >fine grout and 1/2" for coarse grout.

>Regards,

>Scott
>Adrian, MI

Scott,

Using anything more than 2" of cover means you might as well leave the bar in the center for anything less than a 12" CMU.

However, that brings up a good point. If you do put 2 bars in one cell, K is also dependent on the clear spacing between bars. If you were to use #6 bars with 2 1/2" cover in an 8" CMU, K would be 1.125" due to spacing. At 2" cover, K is 2" due to the cover. Put one bar in the middle and K is 3.4375".

--

Adam Vakiener, P.E.
Structural Engineer
Southern A&E, LLC

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