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bjherron 09-07-2007 09:46 AM

roof OSB gap
I'm building a house, and I noticed that the framers have a pretty big gap between OSB sheets. Is this a problem? What is the most gap that should be between two sheets of OSB?


DeeTee 09-07-2007 11:22 AM

Just a Little
An eigth inch is what I've always known it to be and on the horizontal spans using the infamous clips is a good idea. I say infamous because some carpenters don't like them. :yes:

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Cole 09-07-2007 12:15 PM

How big are the gaps you are seeing?

bjherron 09-10-2007 02:23 PM

I'd say typically between 1/8" and 1/4" for most of the roof, with a few approaching 1/2". Some of the hip ends are also around 1/2" gap. They are using the clips between them. Is this going to be a big problem?

This is my first house project as a GC, and I am not a framing expert so I decided to find an experienced framer and pay them to check out the work. It looks to me like a few of the trusses may be off alignment and I'm not sure if it's somthing I have to live with or if I should make them tear the whole roof apart to fix. It's a spec house that I'll live in for a few years, but I want it to be right.


DeeTee 09-10-2007 03:39 PM

A little more investigation
To me 1/2" gaps falling on a 1-1/2" truss member crams the space for nailing, and if the sheathing is anything less than 5/8" (and even if it is) you may find you'll have a rolling appearance to the roof over time. It's not so much individual things but when you take all of the issues together they start to add-up to future trouble. Having a 1/2" gap where you're using clips means the clips are barely holding on. If you will be hanging rock on the bottom truss chords then out-of-alignment trusses are going to mess that up. If you see a series of 1/2" gaps then I'd check the dimensions of the building to see if there is extra space that's been built in. Out of alignment trusses could also signal a dimensional problem somewhere. Maybe pull your exterior dimensions, check for square and see if things are tracking right. Check your on-center dimension between bottom truss chords. If all of that checks out then maybe it's a sloppy job. It's awful early in the process to have these kinds of things since if they are severe enough you could be making up for them every step of the way to completion, to say nothing of passing inspections.

bjherron 09-15-2007 02:12 PM

I made them fix it in the areas where the gap was big, along with about 20 other things on the punch list. The LVL holding the garage attic up was delaminating and some of the hip trusses weren't spaced properly. I hired another framer to come in and take a look at the work, and he said overall they did a nice job. I would have hired him in the first place, but at the time he told me he was too busy.

thanks for the advice!


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