Brick Veneer Anchors with Concrete Backing

[RiverBeav]

Just curious how everybody attaches their brick veneer anchors to concrete backing, and whether they get the cracked concrete approved anchors. The code is silent on the requirements except that the veneer would be under Chapter 13 of ASCE 7-10, which requires all anchors to conform to chapter 17 of ACI or be preapproved for seismic as post installed anchors. But the masonry code indicates that the attachment to wood backing just needs to be done with an 8d common nail as a minimum.

I have specified a seismically qualified screw anchor, but I get asked on every job to go to something less stringent, so I was seeing what everybody else does out there.

 

[XR250]

I am admittedly not well versed in seismic. I assume powder actuated fasteners are a not allowed?

 

[dold]

Is it a new cast in place wall behind? Spec dovetail anchor rails in the concrete. Then the anchors are inserted and twisted into the dovetail slots. I'm preeeeety sure theyre approved for seismic applications. Its a positive connection.

 

[dik]

I still use dovetail anchors with concrete.

Dik

 

[masonrygeek]

Here is a clarification and a comment. Although the masonry code, TMS 402, Chapter 12 (previously ACI 530) uses the term "anchor" it is really a "veneer anchor" which is like a typical wall tie (these have very specific definitions/applications in the code but I won't go into that here). So I would use Chapter 12 to design the spacing of the veneer anchors and use ACI 318 to design the fastener in the concrete backing. As dik mentioned dovetail anchors could be used in these applications, but we have been seeing more people using post-installed anchors so that they can deal with tolerance or misalignment better.

Also Chapter 12 of TMS 402 covers seismic concerns so the spacing may be dictated by those requirements, but it doesn't cover the fastener.