OSB Rim, I-joist, squash block sandwich?
bhackford
| Posted in Construction Techniques on
On gable ends, do most of you run i-joist parallel or perpendicular to the osb end joist?
I got a new lay out from a company I do not normally use and they show OSB rim and I-joist parallel. I have an email question in to them about squash blocks with that setup. Should I just sandwich on squash blocks to the i-joists and osb rim or do I have to go perpendicular with the i joists and squash blocks?
Replies
Why you think you need squash blks on gable walls?
We do the Rim/TJI combo on gable side....if there are load points, blks. are put there.
You can fill the tji web with ply if you want.
There's no reason to run an I-joist alongside a rim board. (Unless a local code requires it)
Some guys around here do it, but don't really have any sound logic behind it. I see it on maybe one house in 50.
Seems to me it actually causes problems. Like how do you through-bolt a ledger board for a deck on the rim board? It's also in the way for running wiring up into the exterior wall.
Squash blocks are only needed at INTERIOR bearing walls where another bearing wall is stacked on top of it. Or where a roof truss girder hits an exterior wall and you have a point load.
Boss, I thought he's talking about 'the side/gable end' of a house.
Who builds a deck on the side?
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Sometimes there are gables on the back of houses too. Just depends on the style of the house. And sometimes the floor system runs left to right instead of front to back. I was talking more about the general need for an I-joist inside a rim board. I don't see any reason to put one there.
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Normally we run short 'outrigger' joists perpendicular off the last common. Then block with a 2x4 nailed to each flange, bearing on the green plate, and 1/16'' higher than the total height of the joist. then rim or even just ply depending on the requirements. This is engineered to account for the load of the bearing wall above and this situation will be specified.The squash block mentioned above for bearing points at interior walls is a different animal. It is supposed to be installed between the flanges with a 1/16 gap between the block and the bottom flange for compression points from above and with 1/16'' gap between the block and the top flange to work in tension point loaded from below as in a cantelever situation. I think this is so when the load is apply the flange won't be seperated from the web. I suspect your new layout is engineered so that the I joist and rim will carry the load above. A lot of specifications are deserned for ideal situations, meaning in this case the rim and joist should be perfectly plumb. I would not be afraid to add perpendicuars to help train the joist so that it behave in the desired manner, unless you think these perps will haunt you down the road. This info comes out of my head but it originally came out of the Roseburg Forest manual. My memory is sometime faulty but these are rules of thumb I live by.
"The squash block mentioned above for bearing points at interior walls is a different animal. It is supposed to be installed between the flanges..."
I think you've got that wrong. What you described is for where an I-joist goes into some types of hangers.
The blocks for bearing walls above an I-joistt are 2X4s nailed alongside the I-joist.
they're covered on pages 22, 23, and 25 23 of GPs guide:
http://gp.com/build/DocumentViewer.aspx?repository=BP&elementid=4372
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Sorry didn't mean to offend. . Glad you checked the guide. What I describe is called a web stiffener. And is described like that in their manual. 99% sure. Please don't make me dig it out of the stack of crap, I just moved into this house and everything is still in boxes. I love how you guys cut and paste like a bunch of trial lawyers. If we could only do this in real life a lot of BS would disappear. I mentioned my memory. And was in no way pointing a finger. Edit: looking for sometthig else I found the rfpi design guide page 25 shows web stiffener requirements as I described, so the right info is out there.Edited 6/12/2005 5:20 pm ET by quicksilver
Edited 6/12/2005 5:22 pm ET by quicksilver
You didn't offend me - I just wanted to make sure the right info is out there. If that means pasting a link to a website I have bookmarked anyway, that's what it takes to get it done. When you say "If we could only do this in real life a lot of BS would disappear." I have no idea what you mean.
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