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Old 07-26-2012, 12:51 AM   #1
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joist/rafter question


Hi again all,

Have a question about how staggered ceiling joists and rafters with a ridge board work.

I understand the theory of both individually but don't understand how they work together and still have squared rafters if the rafters have to have the same offsets that the joists have to have.

Do you angle them in towards each other so they are centered over the joist pairs? Does this not mess up the nailing of the roof sheathing?

Thanks,
-rev
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Old 07-26-2012, 12:57 AM   #2
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joist/rafter question


They land beside each other on the ridge board.

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Old 07-26-2012, 01:24 AM   #3
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joist/rafter question


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Originally Posted by mae-ling View Post
They land beside each other on the ridge board.
Do you mean that the rafters overlap each other above the ridge board, so that the ridge board is acting like a beam?
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Old 07-26-2012, 01:28 AM   #4
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joist/rafter question


Only heard of this never seen it or done it.
Not on top but on each side of the ridge board and lined up to be beside each other not in line with each other.
Would give good nailing through the ridge board and into the end of the rafter.
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Old 07-26-2012, 04:29 AM   #5
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joist/rafter question


A 2x block can be installed as a spacer to keep everything in line and square. Most times when the ridge "beam" is used, there are no ceiling joists to get in the way.
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Old 07-26-2012, 09:51 AM   #6
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joist/rafter question


I think he is talking about a ridge board, not a beam that the rafters sit on.
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Old 07-26-2012, 11:03 AM   #7
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joist/rafter question


Forgive me if I'm missing something, but I don't think we are addressing the OP's problem. As I see it, he is concerned that his rafters from opposing sides willl not meet exactly opposite each other at the ridge, but will be slightly offset from each other, as on the sketch.
Structurally, this won't be as good because you should be nailing rafter through to rafter, rather than rafter to ridge board.
As I said I might have missed something, or there may be some Simpson device that solves the problem (there always sems to be).
All I could suggest is that the ceiling joists should have been half-lapped where they cross over the middle wall, to keep them in one line.
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Old 07-26-2012, 11:05 AM   #8
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joist/rafter question


I think you got it right, and what you drew is what I was thinking.
Because of the ridge board, them beside beside and not hitting dead on each other wouldn't be an issue - well that is my thought.
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Old 07-26-2012, 11:13 AM   #9
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joist/rafter question


In a typical stick framed roof the rafters never line up with each other. Just take it as the north side of the home the layout will be 16'' and go, the south side of the home will be 16'' and back, the bearing wall will be 16'' to center.
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Old 07-26-2012, 11:47 AM   #10
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joist/rafter question


I've seen them offset from one side of the ridge to the other and it is such a small amount that it really wouldn't hurt anything. I've also seen them run off by 3/4" inch so that they met. The 3/4" out of plumb/square on a rafter is pretty trivial over the length of the rafter.
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Old 07-26-2012, 12:00 PM   #11
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joist/rafter question


Sorry, yes I meant ridge board, not beam. My apologies. I had thought that you always had to nail rafters directly opposing to each other, and that's what some instructional videos on youtube were doing, even though the joists in their example were offset like I showed.

So I was very confused when I was looking at our plans that called for overlapping joists in the room view of the building, but centered rafters in the roof view. How were we supposed to achieve staggered joists and directly opposing rafters?!

If the rafters can be offset, or even out of square by 3/4" just to make them meet, then things make more sense to me.

Last edited by revlis_dyi; 07-26-2012 at 12:07 PM.
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Old 07-26-2012, 01:03 PM   #12
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joist/rafter question


Can ytou give us a link to the web pages or videos?
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Old 07-26-2012, 01:21 PM   #13
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joist/rafter question


[quote=revlis_dyi;974787] How were we supposed to achieve staggered joists and directly opposing rafters?!

quote]

I suppose it depends on the scale of the job. If it is a wide-span roof, then the rafters will be long, and twisting each opposing rafter sideways by 3/4"at the ridge will barely be noticeable and will hardly impact on the joint with the ceiling joists.
If it was a narrow roof (say a small shed), with short rafters, it would be harder to twist each one to meet, and would probably open up the joint at the bottom as well.
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Old 07-26-2012, 07:51 PM   #14
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Old 07-27-2012, 01:05 AM   #15
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Quote:
Originally Posted by 3rdGeneration View Post
Clear as mud.

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