Rubble Stone Veneer Anchorage

[jdgengineer]

We are looking at anchoring some +/- 4" thick rubble stone veneer to a single-story wood-framed residential structure in a high seismic area. I believe the architect wants to have a drainage mat behind the veneer. We were initially looking at a Hohmann & Barnard product HVR-195VB. I've called the manufacturer and they seemed to indicate that it could be installed to wood studs. We don't have the rigid insulation layer on the outside so I'm not sure if dimensionally it will work ok. The mason wants to use corrugated wall tie for the attachment. Some of the stones are quite large. We would typically specify that the anchors occur at 16" oc each way, but with the size stone they want to use I'm not sure this will be possible.

What have you all used in similar situations? Do you have any recommendations?

 

[Shotzie]

We recently used Link on a project. Reps came out, installed a tie, and performed a load test. I believe the results were quite good. The tie was fastened back to a wood stud wall, there was an insulation layer.

 

[jike]

I believe there is a square inch requirement per anchor in the code (I don't remember what it is however), therefore if the 16" oc doesn't work with the stone, as long as you meet the code requirement.

 

[jdgengineer]

Hi Guys -- Thanks for the response. Yes, there is a sf requirement for the anchors under the prescriptive anchor option. In high seismic with corrugated anchors I believe it works out to be roughly 2 sq ft, which would allow 18" x 16" anchor spacing. The code also allows an "engineered" approach rather than the prescriptive anchor spacing requirements but we have never pursued that option before. I'm assuming large dimension stone (marble, etc.) uses a clip system with larger spacing following a more engineering approach, so I'm not sure if there is something that someone may have used for rubble stone which would be similar.

 

[StrucDesignPE]

I have used the Heckmann 103-C dovetail on a rubble stone-to-wood stud construction on past projects.

 

[masonrygeek]

Here is some basic information on rubble stone walls from the International Masonry Institute:

http://imiweb.org/wp-content/uploads/2015/12/07.03-Stone-Veneer-Walls-Laid-in-Mortar.pdf.

I think some of the information is behind by one code cycle, but the general ideas are still pertinent. The H&B product mentioned by jdg is typically used in most rubble stone applications. When the stones are varying size, this type of tie/anchor works out well. It also gives some leeway for the mason as they install the stone. As for seismic requirements, just refer to the most recent TMS 402 (previously ACI 530) for the prescriptive requirements. As you stated they basically require a tie/anchor 16" x 16".