Ok guys, I am in the process of rebuilding and adding on to my shop. I have an area that will be 12'x20' in size. I need to run the ceiling joists over the 20' span. Will 20' 12"x2" on 24" centers be strong enough to support the ceiling?
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Ceiling joist question
- Thread starter Runum
- Start date
nova65ss
Well-known member
Runum said:Ok guys, I am in the process of rebuilding and adding on to my shop. I have an area that will be 12'x20' in size. I need to run the ceiling joists over the 20' span. Will 20' 12"x2" on 24" centers be strong enough to support the ceiling?
Are you able to find 20' 2x 12's? Any reason you can't go the 12' span?
Thanks. Yeah I just went to HD and they had the 20 foot 2x12's there. This is an addition and I need the joists to travel in the same direction as the existing joists. The span in the original section is 28 foot. They used a truss in the middle and 2x6's 14 foot long. I am adding an interior wall so I only need to span only 20 foot. I would like to do it without building a truss. I am planning on hanging 7/16 OSB from it. What do you think?
bigdogrider99
Member
Here is a site that will let you punch in the numbers and let you know.
http://www.awc.org/calculators/span/calc/timbercalcstyle.asp
24" on center won't make it.... but 16" will
I don't know what load or lumber grade you are looking at but I ran a quick look at the 24" span with #1 eastern white pine and the loads they had in the calculator and it comes up at a little over 17 ft. 16" span is 21' 8". Just watch out for weight if you plan on storage up there.
Is this addition going to be inspected by the county or city? They will dictate what you can do or can't.
http://www.awc.org/calculators/span/calc/timbercalcstyle.asp
24" on center won't make it.... but 16" will
I don't know what load or lumber grade you are looking at but I ran a quick look at the 24" span with #1 eastern white pine and the loads they had in the calculator and it comes up at a little over 17 ft. 16" span is 21' 8". Just watch out for weight if you plan on storage up there.
Is this addition going to be inspected by the county or city? They will dictate what you can do or can't.
sayemthree
Active member
- Joined
- Jul 5, 2006
- Messages
- 33
bigdogrider99 said:I don't know what load or lumber grade you are looking at .
the calculator used 40 psf live load a 10 dead load - equivalent to a residential floor load (is says floor joist) - so if he uses it for a ceiling joist with light attic storage he will be fine. just make sure if they have any camber to install it up.