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RE: Nailer on Masory Wall

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Technically speaking the only place that cross grain bending and cross grain tension are outlawed by the code in Section of ASCE 7-05.  This section is for the lateral anchorage of structural walls and only required if you are in a Seismic Design Category C through F. 


If the H2.5 anchors are for uplift control of your TJI joist then that connection doesn’t fall under the lateral anchorage section mentioned, and per code you may not be required to use something else (local codes may add additional requirements).


But I may be confused, if the joist are bearing on a sill on the top of the wall, then there must be an out-of-plane connection anyway, one that either uses the sill or works around it?


Jason Christensen, S.E.


From: Doug Mayer [mailto:doug.mayer(--nospam--at)]
Sent: Friday, May 22, 2009 2:15 PM
To: seaint(--nospam--at)
Subject: RE: Nailer on Masory Wall


Thanks for the replies.  To clarify, this is an interior bearing wall where the joists (TJIs) run over and bear on the nailer on the top of the cmu wall. 


I know cross-grain bending is bad, but I’m just curious where in the code it says that it is outlawed in all cases.  Again, all I can find is in reference to lateral anchorage for concrete/masonry walls to diaphragms. 




Doug Mayer, SE

Structural Engineer


From: Jnapd(--nospam--at) [mailto:Jnapd(--nospam--at)]
Sent: Friday, May 22, 2009 12:57 PM
To: seaint(--nospam--at)
Subject: Re: Nailer on Masory Wall




If you hang the joist from the wall with top flange hangers and put Pa straps at bottom of joist max 4' o.c.  that usually works assuming 12" deep joist min. to get coverage around strap in cmu wall.


Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA


In a message dated 5/22/2009 12:51:09 P.M. Pacific Daylight Time, ronbuchko(--nospam--at) writes:

Most effective method of connecting a wood nailer(ledger) AND to avoid X-grain bending is to place two (2) anchor bolts (staggered) within the masonry wall a distance equal to the depth of the ledger. This will usually require a deeper ledger than would normally be required. Eg. for a calculated 2X10 you would use a 2X12 and locate the ab's min 3" from the top and 3" from the bottom of nailer thereby "fixing" the nailer in place and reducing the danger of X-grain bending.  

--- On Fri, 5/22/09, Doug Mayer <doug.mayer(--nospam--at)> wrote:

From: Doug Mayer <doug.mayer(--nospam--at)>
Subject: Nailer on Masory Wall
To: seaint(--nospam--at)
Date: Friday, May 22, 2009, 12:11 PM

Situation:  typical nailer on top of a cmu wall.  Joists bearing on nailer and ties (H2.5) connecting joist to nailer for uplift.

Problem: DSA (California) backcheck comment believes that cross-grain bending of the nailer needs to be avoided and to design direct connection to cmu wall.

I have never seen the code address cross-grain bending in anything other than lateral anchorage of masonry/concrete walls to diaphragms.  Does the code somewhere specify that cross-grain bending in this situation is not allowed?  Any help would be appreciated.


Doug Mayer, SE

Structural Engineer



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