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Old 02-04-2012, 08:38 PM   #16
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ceiling span vs. joist size


Quote:
Originally Posted by ratherbefishing View Post
Dude,
I sent you a link for the simple calculation. It says (assuming Douglas Fir) that you can use 2x6s for ceiling joists. Unless you are trying to reuse your old 2x4s (and I can undestand that), 2x6s don't cost that much more. If you are trying to reuse your old 2x4s, just space 'em 12" OC. The insulation can be taller than the joists, so you can still use R-30 (code here) if you want to.
thanks, i was referring to the 2x10 suggestion. no, i'm not reusing old and i was planning on 2x6. i hope SPF lumber from HD/lowes is (as strong as) Douglas Fir.

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Old 02-04-2012, 09:08 PM   #17
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ceiling span vs. joist size


Quote:
Originally Posted by ratherbefishing
Dude,
I sent you a link for the simple calculation. It says (assuming Douglas Fir) that you can use 2x6s for ceiling joists. Unless you are trying to reuse your old 2x4s (and I can undestand that), 2x6s don't cost that much more. If you are trying to reuse your old 2x4s, just space 'em 12" OC. The insulation can be taller than the joists, so you can still use R-30 (code here) if you want to.
But...the op said the rafters are the joists. There is no attic.
If all you want is R-13 or 19...

Unless I'm reading something wrong.

Uh...I went back and re-read the posts. I think you're saying it's just as I understand it, ie no attic in your
first post, then you changed it a little while ago with the bold print "the joists aren't holding the roof" in a later post.
You can't have it both ways.

Last edited by titanoman; 02-04-2012 at 09:17 PM.
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Old 02-04-2012, 09:17 PM   #18
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ceiling span vs. joist size


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But...the op said the rafters are the joists. There is no attic.
If all you want is R-13 or 19...
there is an unusable gap between the two. it is too small to be used for anything. but the rafters can't be used for ceiling cause they are slanted. so the joists i'm putting in are just to make the ceiling level.

sorry for the confusion. i should have made that clearer in the OP.

thanks
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Old 02-04-2012, 09:20 PM   #19
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ceiling span vs. joist size


Southern-pine-fir has varying grades also, just like Doug Fir.
For a 9' span you can use SPF on 16" centers for a dead load of 5 lbs. and a live load (without storage) of 10 lbs.
All grades of either species works.
Just remember that I am not suggesting you to do anything here, just disseminating a little prescriptive info.

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Old 02-04-2012, 09:22 PM   #20
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[QUOTE="amakarevic"
there is an unusable gap between the two. it is too small to be used for anything. but the rafters can't be used for ceiling cause they are slanted. so the joists i'm putting in are just to make the ceiling level.

sorry for the confusion. i should have made that clearer in the OP.]

So your roof (the outside) has one slope to it, and there was a different slope on the inside ceiling, so you took those out and want to put them back level, right?
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Old 02-04-2012, 09:40 PM   #21
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Is it possible that these old 2x4's were possilby true 2x4's slow growth lumber and not the current 1 1/2 x 3 1/2 fast growth lumber.
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Old 02-04-2012, 10:47 PM   #22
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ceiling span vs. joist size


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So your roof (the outside) has one slope to it, and there was a different slope on the inside ceiling, so you took those out and want to put them back level, right?
the roof is pitched maybe 15 deg. the ceiling should be pitched 0 deg. at the highest, the gap between the two is maybe like a foot, if that.
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Old 02-04-2012, 10:48 PM   #23
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Is it possible that these old 2x4's were possilby true 2x4's slow growth lumber and not the current 1 1/2 x 3 1/2 fast growth lumber.
i dunno slow vs. fast growth but the size was definitely the new, reduced size
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Old 02-05-2012, 01:35 AM   #24
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Ok, I suggest 2x8's or 2x6's. From what I've read, we're talking ceiling joists, not rafters, to basically hold up drywall. No live load? C'mon, I gotta call the government to do that in my own place???
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Old 02-05-2012, 04:00 AM   #25
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C'mon, I gotta call the government to do that in my own place???
you got that right, sonny... you're being watched. heck, we can detain you indefinitely for building without permits... and put a lien on your house.

but hey, it's all for the sake of everyone's safety. don't you feel safe?
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Old 02-05-2012, 05:27 AM   #26
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Unless you know your building codes, have the experience, and are qualified to complete the job successfully, all structural building projects need a permit! - Ty owner (Hilti Construction Ltd.)

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Old 02-05-2012, 09:07 AM   #27
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ceiling span vs. joist size


Quote:
Originally Posted by Joe Carola

Amazing all the questions you have about doing structural work illegally on your house......and yet people here answer and don't care either.
Joe, Hilti, et al.,

I'm using a mobile device, so I can't see the OPs full profile, to know his location. But YOU have got to realize that there is an abundance of people who live in rural areas where building code enforcements and permits are literally non-existent. Not everyone is breaking the freakin' law when they want to put together some structure with their own brain and hands.

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Old 02-05-2012, 10:07 AM   #28
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ceiling span vs. joist size


Quote:
Originally Posted by jlmran

Joe, et al.,

I'm using a mobile device, so I can't see the OPs full profile, to know his location. But YOU have got to realize that there is an abundance of people who live in rural areas where building code enforcements and permits are literally non-existent. Not everyone is breaking the freakin' law when they want to put together some structure with their own brain and hands.
Thank you. That's what I keep saying and it pee's some people off.

Some people (and I'm not mentioning any names) think they are the permit police.

It's up to the DYI'er if they want or even can get a permit.
Permits should be for people that desire the input from somebody in an official capacity so they know what they are doing is safe or so they know their contractor is doing their job right.
Like I mentioned earlier, you can build as big of a house as you want at the Lake of the Ozarks and the only permits you need are for septic systems and fire.
I don't think that's enough.
In California, you have to have your pier holes for your deck (and the way the rebar is tied, loop it twice) and your drywall nail pattern inspected.
I think that's too much.

But It's none of my business what people do on their own jobs.
I might suggest they go to their planning or building department, if they have one, for spanning codes or something.
But unless they're doing commercial work, which I doubt DIY'ers are, I don't care and I'll answer their building questions the best I can.

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Old 02-05-2012, 03:10 PM   #29
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ceiling span vs. joist size


why doesn't this forum have the functionality to block useless commentators? Like FB
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Old 02-15-2012, 08:23 AM   #30
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ceiling span vs. joist size


My opinion is that a DIY forum should never have a reply posted that advises getting a "pro" or a finger wagging "you'll need a permit" snipe. If this is the only comment an individual can conjure up then the best service they can provide is to NOT reply at all.

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