Hurricane Clips 1

[DevinTheStudent]

Hello All,

I have a question about hurricane clips in roof rafters (see attached photo)

Rafters are clipped to walls on each side (beside 2x6s see attached photo), however they are not clipped to the beam

Contractor has clipped to the bottom of the beam with 2x6s where the drywall will be installed.

From my perspective it seems like the rafters should be clipped on top as well to prevent uplift however is the way
the contractor went about this adequate? very unique circumstance.

 

[phamENG]

When you apply the uplift load to the rafter, does it require a support at the beam? If not, then this may be adequate as is. If you need a support there, then it isn't.

A couple things to keep in mind: the ceiling connection cannot use the full loads listed in the Simpson tables. Those tables assume wind load, not dead load, so you need to adjust the capacity accordingly.

At the wall, the clips are installed on the interior. Unless you provide additional strapping or other load path elements on the interior, the load path has to go from the inside face at the clips to the exterior at the sheathing (assuming the sheathing is detailed to provide uplift resistance). That forces the top plate to roll over and the capacity of the clip drops to something closer to 165lbs rather than the listed 500+. Simpson did a bunch of research on it several years ago and they have a technical bulletin out there somewhere.

 

[jayrod12]

Everyone at my office is well aware of the simpson technical bulletin on that because I screamed it from the rooftop everyday for a couple weeks when it came out.

And yet, I'm still seeing them shown on the inside face of walls on occasion on our drawing sets. And quite often in the field. But I make them change it everytime.

 

[phamENG]

jayrod - apparently they let that TB expire and they don't talk about it anymore. It's still out there (and I have a copy), and it seems the physics that caused it back then haven't changed...so I'm not sure why.

I've gotten a lot of push back on it from contractors on multistory projects since the scaffolding, if ever present, is gone by then (it's typical for a lot of contractors to do all the strapping after the sheathing inspection). So I just detail an interior load path using Simpson truss screws. It's really easy, surprisingly effective, and relatively cheap.

 

[skeletron]

A link to the TB to help anyone following this thread.

 

[Enable]

Thanks team. Skeletron that was an interesting read. Not something I've ever thought of. Appreciate it.

 

[skeletron]

I had to look it up after phamENG and jayrod12 mentioned it. Good recommendation and discussion!