Stud wall connection to precast plank garage floor (residential)

[TroyD]

Please see attached concept sketch. Custom home builder has a precast garage floor (with basement storage underneath). At the garage rear wall, the building official is requesting a detail for connecting the exterior stud wall to the precast **and allows for 1/2" deflection up/down** for the movement of the precast deck. I am aware of some Simpson Strong-Tie framing angle connectors with slotted fastener holes, but those apply to light gauge steel stud framing attached to concrete/precast. Is anyone aware of a similar product for 2x6 studs?

 

[jayrod12]

Simpson released capacities for those same slip connectors for wood.

 

[jayrod12]

Alternatively, you could fasten a wood plate directly to the precast, then provide a slip joint between that plate, and the wall bottom plate using pre-drilled holes in the wall bottom plate and thick spikes.

Simpson actually just released a slip joint screw with a sleeve that is similar to my proposal, just uses screws with a sleeve instead of spikes.

 

[r13]

How is the precast slab panel supported at the edge, thru the connector to the 2x6 stud?

 

[jayrod12]

I just looked at your detail. Yuck. I'm not a huge fan of that at all. What is supposed to protect the wood from the water/dirt etc coming off the vehicles? There should be some type of curb at the edge to prevent water from going between the two.

But that aside, I don't see why you couldn't use the bypass clip connector from simpson strong-tie. I can't imagine the loading is that large.

However, I appreciate that in a perfect world you have a manufactured edge against the wall that may allow you to install some concrete screws, however it is just as likely that you have a half cut piece right at the wall. I'd be more partial to the attached.

 

[TroyD]

The end precast plank is being designed to span without edge support. The stud wall is supporting the roof above. MOLIN is the precast fabricator and this framing condition is somewhat common. I am designing the clip connectors to resist the lateral wind loads on the wall. Those loads should be easily transferred into the precast floor diaphragm. The builder will provide a curb/pour stop along the edge of the plank.