Friday, May 22, 2009

Re: Nailer on Masory Wall

Doug
 
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@yahoo.com 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@taylorteter.com> wrote:

From: Doug Mayer <doug.mayer@taylorteter.com>
Subject: Nailer on Masory Wall
To: seaint@seaint.org
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.

TIA,

Doug Mayer, SE

Structural Engineer


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