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Posted by Mark on January 2, 2007, 10:27 pm
If the framer was worth his pay, the joists should be 16" oc and the joints
should fall fine. I know that's wishful thinking in many cases, so when
you pick up your drywall, grab a few 2x4 as well and if you come across the
one joist that isn't at 16, screw a nailer on the side of the offending
joist and be on your way.
>
> thomas.jacobs@dva.state.wi.us wrote:
>> 23'x10' ceiling on three-season porch with rafter's 16"OC.
>> Help me understand. Everything I read says that I should run the
>> sheets parallel to the joists for strength. I can do that by
>> minimizing butt joints using 4x12x1/2 sheets.
>> I can avoid butt joints all together by using 4x10x1/2 sheets parallel.
>> I have checked the nailing edges and they fall on rafters. What am I
>> giving up strength wise running parallel to rafters? What else
>> haven't I thought of yet? Thanks tom
>
> Don't have a real number, but w/ 16" O/C, I'd not worry w/ 1/2" or
> thicker. I'd go the parallel direction w/ those dimensions for the
> elimination of the butt joints and it eliminates the other length-wise
> seam if use 4x12 the other way. If I do the seam-counting right in my
> head I get you would have 46-ft edge and 14-ft butts (assuming stagger
> sheets to not have a full-width butt joint) or 50-ft of edge seams the
> other way w/ the 4x10's.
>
> The only other thing I'd check is how close the tolerances are on the
> rafter spacings as if they're just 2x material you only have 3/4" when
> you split them so there's not a lot of slop for the joints. It also
> will take getting the first sheet lined up pretty carefully so it stays
> online going forward as you've got a total of five seams to make work.
>
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