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Beginner owner builder here.

We're setting up our Ijoists and our plans call for 4x Posts and a 6x6 Post I believe to attach to the mud sills.

Would love any help figuring out our engineered plans for this. The holdown specs are clear, but we're trying to figure out - do these posts need to run the entire height of the building (1 story) or are they just supports by the ijoists and rim walls, and don't extend up past the sub flooring.

Attaching a few photos for reference.

Thanks for all the help!
 

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retired framer
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The post is in place of a stud, same length as a stud.
He is also calling for what we call squash blocks below the post and behind the rim joist, we put then under all window and door jacks too.
 

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In the event that op was thinking “gotta buy 4x4 posts”, and Not having the whole plan, I’d just use two 2x4 nailed together for the “posts” as shown in third diagram from bottom. Ron
 

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retired framer
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In the event that op was thinking “gotta buy 4x4 posts”, and Not having the whole plan, I’d just use two 2x4 nailed together for the “posts” as shown in third diagram from bottom. Ron
The bottom picture does show posts, so what is called for should be somewhere on the plan. We had one engineer that would call for them all the time.
 

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Yes, it should be in the plan....but while the bottom pix specifies “posts”, so does third from bottom.....but that one allows for double two bye four built up posts and gives nailing schedule for same. So, something to square with the engineer as opposed to the internet. Ron
 

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Discussion Starter #6
Thanks all so much. You solved some problems and helped confirm what we were thinking regarding posts vs. nailing 2x together.

Onward!
 

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Hammered Thumb
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Just a quick note, make sure the engineer doesn't need the full 3.5" (4x4) instead of 3" (two 2xs) for his posts, or triple up. And they do not "replace" the studs, they are fixed on the shear edge portions of the wall, so the 16" o.c. happens around them. Assuming with the odd dimensions he's using the minimum he needs, unless there is wall fenestration he's working around.
 
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