How to attach deck joists to 4x4 posts

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Old 06-13-16, 06:30 AM
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How to attach deck joists to 4x4 posts

Hello!

Small deck going just over the rail of a 48" high above ground pool.

I did a quick sketch here, but hardwarewise, how do you attach the joists to the posts? I was going to use two galvanized bolts/washers/nut from front and then three deck screws from the sides, but that's just looks like a whole lot of business in that post.

Is there a better way?

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Old 06-13-16, 06:40 AM
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Should be using 6x6's and notch them so the rim joist actually sits on the post... then bolt them.
 
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Old 06-13-16, 06:43 AM
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Should be using 6x6's and notch them so the rim joist actually sits on the post... then bolt them. See Figure 8a, 9. http://www.awc.org/pdf/codes-standar...Guide-1405.pdf
 
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Old 06-13-16, 06:46 AM
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https://www.google.com/search?q=deck...RFRqYWWlwjM%3A
The bolts go one above the other not side by side like in your picture.
That blocking is needed so the rim joist do not flex and try to come apart.
Have to agree with Xsleeper, 4 X 4's love to twist, curl.
 
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Old 06-13-16, 08:31 AM
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I'm missing something.

I'll have 6.5" 4x4 posts on deck blocks (1' high). So the top of the posts are at 7.5'. At about 46" inches off the ground, attach 2x8 joists to the posts (in that diagram I posted earlier), then the deck boards on top of that so they slightly go over the pool rail. Attach rail to the part of the posts above the deck, and attach pool steps to the deck itself. (We just want to come off the existing deck, go across the new deck, and into the pool, rather than coming off the old deck and then use that ladder.)

I wasn't going to do beams then joists. Just joists.

And then that structure will bolt to the existing deck/porch.

I just saw the hardware coming into the 4x4 from two directions and wasn't sure the best way for that.

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Old 06-13-16, 11:41 AM
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What you are missing is that 4x4's and bolting to the side of a 4x4 are no longer allowed by most building codes. See figure 8a and 9 in the link I provided earlier. (You would want to check your local building code)

There are probably also codes that prohibit a deck from going right up to a pool without a 42" railing and gate to keep little ones out.

Structurally, your rim joist on the left and right of your picture should be doubled. And if 4x4's are approved in your area, the doubled rim joist could sit on top of the post in a post-beam bracket.
 
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