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Old 09-20-2014, 11:48 AM   #1
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Rafter spacing


I'm building a hip roof over my deck.
I was planning on spacing the rafters at 15" but if I increase the spacing to 17.5" it makes the spacing much more even on the hip end of the roof.
The roof is 12x16' and I'm using 3/4" plywood sheathing and 2x8 rafters.
Is there any reason the extra 2.5" spacing would cause me problems?
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Old 09-20-2014, 11:59 AM   #2
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You would have to do some cutting for the odd ball spacing. 16" o/c to 24" o/c is standard.



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Old 09-20-2014, 12:13 PM   #3
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Do you mean cutting the ply for the odd spacing?
I wouldn't think that the rafters wouldn't really be affected.
Mostly I was concerned with sheathing sag like I've seen on a few houses with really wide spacing.

Edit: I just reread. No greater than 24" and I should be fine, right?
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Old 09-20-2014, 01:33 PM   #4
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What Greg is trying to say.If I may speak for you Greg is that ply comes in 48" wide sheets X 96" long which works out for 16" oc center spacing for studs and trusses.Been that way a long time.
If you go 15" that would be a 44 1/4" piece to start so you cut that sheet and then you have to offset the joint on the next piece.So more weird cutting and then the waste piece will not be usable.Go 17.5 more waste.
Building materials are designed in the sizes they are for that application.

Last edited by mako1; 09-20-2014 at 01:41 PM.
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Old 09-20-2014, 02:09 PM   #5
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Also I've never seen a sloped roof sheathed with 3/4".
5/8 is enough.
Any roofs I've seen with issue was caused by undersized rafters, no H clips between the rafters, old roof leaks or to many layers of shingles.
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Old 09-20-2014, 02:27 PM   #6
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There is no reason the spacing needs to be exactly 16" everywhere. It may work out that your last space is 12" or something, but that's OK.
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Old 09-20-2014, 02:43 PM   #7
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Got it.
Thanks guys.
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Old 09-20-2014, 08:04 PM   #8
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Figure out from the two ends one rafter there. Then figure out the spacing from the center of the house, working towards the ends. You may end up having a rafter within 6-7 inches from the two end rafters.

All of this, should have been noted on the building plans.



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