Deck joist connected directly to house band?

[Michael Larson]

Let me bump into this thread.

What do you think about this?

[Mark S. Tyson]

FYI on screws being used to attach hangers. Simpson Strong Tie company manufactures screws specifically for that application. (SDS wood screws) and some of their hangers specify that those screws be used in lieu of nails

[Jeffrey R. Jonas]

Originally Posted by mtyson

FYI on screws being used to attach hangers. Simpson Strong Tie company manufactures screws specifically for that application. (SDS wood screws) and some of their hangers specify that those screws be used in lieu of nails

Thanks for the info Mark. Are these a relatively new product?

[Christopher Currins]

Originally Posted by jjonas

Thanks for the info Mark. Are these a relatively new product?

They've been available for about a year. I've only seen them used once. Identified by the hex head and number stamp. These are the only ones I know of that are approved for hangers.

Strong-Drive® SD Screw for Structural Connectors

[Kenton H. Shepard, CMI]

Those hangers are nailed with roofing nails. Z-flashing should be installed behind the ledger that extends down over the siding. It's a defective installation.

[Kenton H. Shepard, CMI]

Originally Posted by jjonas

Poor shear strength. Screws are not approved by the manufacturer in joist hangars. There is a specialty screw that is okay instead of lag bolts, but they still should be staggered. They are pretty obvious when you see them. I'm sure Marcel or someone else will jump in with the name of the screws, and more info. As far as your project and it being engineered, first question is by whom? Doesn't really matter, as they technically take responsibility if it fails. That is assuming it actually was, and have the papers to prove it. None-the-less, I call out what I deem to be a safety issue. Everyone else can hash out the details. My job is done.

Screws used through the sides of the hangers are not exposed to much shear unless there's an extreme cantelever. The roofing nails used to fasten the hangers to the rim joist are resisting shear and roofing nails will not meet the specs for that condition.

The typical schedult for lags is one 1/2-inch lag every 24 inches, staggered up and down. 2 lags every 32" will probably do it too. If it's engineer-approved (how do you know it is?) then it's on the engineer. I probably wouldn't call the lags or scresws, but I'd call the roofing nails and recommend a SE

[Kenton H. Shepard, CMI]

Originally Posted by mtyson

FYI on screws being used to attach hangers. Simpson Strong Tie company manufactures screws specifically for that application. (SDS wood screws) and some of their hangers specify that those screws be used in lieu of nails

How do you recognize them? If I saw screws fastening hangers to rim joist, I'd call it and let them prove that it's an approved fastener.

[Larry D. Kage]

Originally Posted by kshepard

How do you recognize them? If I saw screws fastening hangers to rim joist, I'd call it and let them prove that it's an approved fastener.

Simpson identifies their screws like this:

http://www.strongtie.com/products/co...-loadrated.asp

[Marcel R. Cyr]

Nice Larry, but once they see the cost of those screws, they will use regular nails.

They also make a screw for screwing truss plies together.

This one is considered structural.

[Brian E. Kelly]

Originally Posted by jmanders

I was inspecting this house this morning and the deck joists appear to be attached directly to the rim joist (house band) via deck joist hangers. There is a ledger board attached to rim joist with ledger bolts where the deck stairs are, but for only 36 inches (the entire width of the deck is roughly 15 ft.).

I haven't seen a deck installed like this, but I'm assuming there might be a support issue as well as water intrusion issues. Please advise. Thanks guys.

My comments for a deck like this are something like....The deck looks to be an "After market add on" and may have been built without a permit, recommend checking for proper permits.

If I was not there when it was built it aint getting my blessing, especially if it looks like it was not part of the original construction.

(needs flashing)

[Marcel R. Cyr]

Didn't know you were a Blesser Brian.

[Mark S. Tyson]

Originally Posted by kshepard

How do you recognize them? If I saw screws fastening hangers to rim joist, I'd call it and let them prove that it's an approved fastener.

the simpson screw has a hex head and has S3 stamped on the head which will always be visible but with that said it is only approved for specific hangers manufactured by simpson

[Larry D. Kage]

Originally Posted by kshepard

The typical schedult for lags is one 1/2-inch lag every 24 inches, staggered up and down. 2 lags every 32" will probably do it too. If it's engineer-approved (how do you know it is?) then it's on the engineer. I probably wouldn't call the lags or scresws, but I'd call the roofing nails and recommend a SE

See page 12 for ledger board fastener requirements:

http://www.awc.org/Publications/DCA/DCA6/DCA6-09.pdf