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Old 06-05-2008, 12:03 PM   #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, 12:28 PM   #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.

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Old 06-05-2008, 01:57 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, 07:17 AM   #4
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How to calculate joist spacing???


Thanks!
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Old 10-16-2014, 03:10 PM   #5
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How to calculate joist spacing???


Than this android application is the solution for you: SPACING CALCULATOR developed by SM.
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Old 10-16-2014, 03:29 PM   #6
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How to calculate joist spacing???


Are they joists or beams, you mentioned both.
You said that they are exposed so I assume they seen from below?
Will they then be floor joists?
If so, what kind of load will they be supporting?
Bedroom of something else?

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Old 10-16-2014, 04:03 PM   #7
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How to calculate joist spacing???


Hopefully he's figured it out since 2008.
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Old 10-16-2014, 04:15 PM   #8
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How to calculate joist spacing???


Quote:
Originally Posted by Maintenance 6 View Post
Hopefully he's figured it out since 2008.
Doh!!!

Thanks.

First time in a long time I not looked at the date when responding.

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Old 10-16-2014, 08:12 PM   #9
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How to calculate joist spacing???


Quote:
Originally Posted by Maintenance 6 View Post
Hopefully he's figured it out since 2008.
That's funny,maybe he's rebuilding by now.

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