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 DIY Chatroom Home Improvement Forum How to calculate joist spacing???
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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.

06-05-2008, 12:28 PM   #2
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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 12:38 PM.

 06-05-2008, 01:57 PM #3 Mold!! Let's kill it!   Join Date: Feb 2008 Location: Central Pennsylvania Posts: 2,849 Rewards Points: 2,012 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
 The Following User Says Thank You to Maintenance 6 For This Useful Post: jack45870 (10-17-2014)

06-06-2008, 07:17 AM   #4
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## Thanks!

Thanks!

10-16-2014, 03:10 PM   #5
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## Spacing calculator

Than this android application is the solution for you: SPACING CALCULATOR developed by SM.

 10-16-2014, 03:29 PM #6 Residential Designer     Join Date: Sep 2010 Location: Orange County CA. Posts: 1,372 Rewards Points: 660 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? Andy. __________________ Residential Drafter/Designer www.draftinginoc.com
 10-16-2014, 04:03 PM #7 Mold!! Let's kill it!   Join Date: Feb 2008 Location: Central Pennsylvania Posts: 2,849 Rewards Points: 2,012 Hopefully he's figured it out since 2008.
10-16-2014, 04:15 PM   #8
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Quote:
 Originally Posted by Maintenance 6 Hopefully he's figured it out since 2008.
Doh!!!

Thanks.

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

Andy.
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10-16-2014, 08:12 PM   #9
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Quote:
 Originally Posted by Maintenance 6 Hopefully he's figured it out since 2008.
That's funny,maybe he's rebuilding by now.

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