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Old 06-05-2008, 11:03 AM   #1
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How to calculate joist spacing???


Ok I'm a math idiot...seriously. The scenario is that I want to space 4 joists evenly between two walls but for the life of me, I cannot calulate the measurements. The beams will be exposed so that is why I want them to look even. I've tried measuring the middle point and working from there but nothing looks right. Is there a simple calculation that I can use? Right now I'm just trying to eyeball it but I really want it to be perfectly even. My brain just won't work.

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Old 06-05-2008, 11:28 AM   #2
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How to calculate joist spacing???


Your on-center spacing would be the face-to-face measurement of the walls divided by 5, give or take. Beam thickness will end up making the outer two off a little, but you can adjust.


Last edited by Termite; 06-05-2008 at 11:38 AM.
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Old 06-05-2008, 12:57 PM   #3
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How to calculate joist spacing???


Take your total width. Subtract the total thickness of ALL the joists. Divide the remainder by the number of Joist CAVITIES. Add the thickness of one joist and that will give you the centers.

Example:
8 foot space= 96 inches
7 joists @ 1.5 = 10.5 inches
96 minus 10.5=85.5
85.5 divided by 6 cavities= 14.25 inches between each joist
14.25 plus 1.5=15.75 inches from center to center
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Old 06-06-2008, 06:17 AM   #4
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How to calculate joist spacing???


Thanks!
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