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Old 09-09-2009, 01:55 PM   #16
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How to use Simpson Hold downs for gaurd rails


Tigerwood (goncalo-alves) can also be stained to look just like ipe...They're in the same species group.

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Old 09-09-2009, 04:51 PM   #17
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How to use Simpson Hold downs for gaurd rails


Lots of good advice and I spoke to soon about 4X4 IPE just couldn't get it from where all my other materials are coming from. Is there away to attach the 4X4 guardrail post directly above a 4X4 beam, could I use a post connector and then trim around the base to hide any exposed metal? My plans have a beam in line with existing overhead posts that I am trying to keep the gaurdrail in line with.
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Old 09-09-2009, 11:36 PM   #18
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How to use Simpson Hold downs for gaurd rails


No, you can't surface mount a post...Not if you want it sturdy.

You can notch the post and bolt it to your deck's rim joist. Nice and sturdy. You can install it before or after you lay your decking. It often helps to attach blocks to the post after installation to give you a good attachment point for your decking so it has its ends secured by the post. That helps stiffen the post as well. Once again, a good place for solid blocking between the joists to stiffen things up!
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Old 09-11-2009, 12:22 AM   #19
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How to use Simpson Hold downs for gaurd rails


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Originally Posted by rocketdoctor View Post
metl2c thanks for pointing out the illustration on the other simpson document, I think I'll go with the dtt2z.
"Upon further review" of your original Simpson detail drawings, a few more sleights-of-hand are revealed by a discerning CSI examiner.

The drawings on Page 9 mentioned earlier show two details. The second one, "Deck to Ledger Installation, Section View" shows the DTT2Z installed above the joist hanger. However, the first one, "Deck to Ledger Installation Detail," shows the DTT2Z fastened over the joist hanger. Because of the short (13/16") centerline offset of the DTT2Z which would interfere with the joist hanger ears, this is accomplished using a different (turned-in) hanger than is shown in the Section View.

I imagine that the old-school builders might pooh-pooh the new 2x turned-in hangers. Certainly not as strong as the conventional ones. They sure look tidy, though.
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Old 05-11-2010, 02:42 AM   #20
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How to use Simpson Hold downs for gaurd rails


I found this thread while also scratching my head over the same problem.

I have emailed Simpson about this, and sent them this diagram:


If you take out any obstructing nails and drill out two holes for the post bolts, once the bolts are tightened the final assembled solution would not seem to violate code or weaken the joist hanger connection.
The offset of the DTT2 in my diagram is a bit exaggerated, and one might argue that it isn't required.
Still, I am a bit disappointed both in that a more-real-world application diagram is not given and that the two brackets don't interlock any better (thus requiring questionably drilling two 1/2" holes through one side the joist hanger).

In addition to the interfering joist hanger, I also have an issue w/ a non-right angle rim. Taking their blocking example as a guide, what is the correct way for a DTT2 to be tied to a joist from a non-right-angle rim?
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Old 05-11-2010, 11:27 AM   #21
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How to use Simpson Hold downs for gaurd rails


It looks like the use of the hold down with the 5/8" bolt replaces the joist hanger, and that would make sense.

The bolt is going to have alot more shear strength than the joist hanger.
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Old 05-11-2010, 11:53 AM   #22
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How to use Simpson Hold downs for gaurd rails


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It looks like the use of the hold down with the 5/8" bolt replaces the joist hanger, and that would make sense.

The bolt is going to have alot more shear strength than the joist hanger.
I don't think its wise to sacrifice the integrety of the joist hanger. the hanger is meant to keep the joist set when the joist is under load from the top, The DT22 won't replace that support. I ended up doing was offseting the post so the Threaded rod just cleared the joist hanger. I used a long threaded rod and put it at a very slight angle so it clears the Joist but fits in the DT22.

for the right angle applications I just toenailed a blocking piece between the rim and joist. this was easiy since I first drilled my holes through guard rail and rim, then attached threaded rod to DT22 then i lined up the blocking toenails it and bolted DT22 to it and tighted up the bolts. Since the blocking piece is just meant to support the DT22 and no load above I didn't see need for joist hangers here.

Just my opinion Im not a licenced structural engineer or professional contractor (however I did get a mechanical enginnering degree 20 years ago )
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Old 05-11-2010, 02:56 PM   #23
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How to use Simpson Hold downs for gaurd rails


I'm saying the hold down would replace the joist hanger entirely. It may seem odd holding the load offset like that, but that is a minimal force that can be easily overcome with simple blocking.

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