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Old 11-06-2010, 12:01 AM   #1
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spanning 18' with 2x6


my roof is almost completed, and I'll be putting up the new ceiling soon. The 1937 redwood ceiling supports where removed and replaced with new 2x6 doug fir.
They aren't going to work. I have the old redwood 2x6's left over and was going to sister them with the new 2x6's
Would this solve the problem or should I sandwich in 3/4" plywood as well?
I plan on using the attic as storage, won't be very heavy just boxes of household stuff.
Thanks...
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Old 11-06-2010, 05:22 AM   #2
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spanning 18' with 2x6


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my roof is almost completed, and I'll be putting up the new ceiling soon. The 1937 redwood ceiling supports where removed and replaced with new 2x6 doug fir.
They aren't going to work. I have the old redwood 2x6's left over and was going to sister them with the new 2x6's
Would this solve the problem or should I sandwich in 3/4" plywood as well?
I plan on using the attic as storage, won't be very heavy just boxes of household stuff.
Thanks...
Are you working with approved plans from the town and building permits?
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Old 11-06-2010, 10:26 AM   #3
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spanning 18' with 2x6


No, I'm just fixing / replacing what was there before. A few of them had some rot. The roof had 1 small vent at the rear of the house and I think that was part of the problem. It didn't sag or move before. I think the problem is the wood up there before was old growth redwood and new wood doesn't compare.
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Old 11-07-2010, 02:51 PM   #4
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spanning 18' with 2x6


Is this 18 feet of unsupport 2x6 or is there a wall under this span that bisects it?
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Old 11-07-2010, 11:04 PM   #5
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spanning 18' with 2x6


Unsupported. My two easy choices would be to sister in another 2x6 sandwiched with 3/4 plywood. or just sister a 2x6.
The real question is what does it take to span 18'
The load will be storage, the roof is all hip and valley.
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Old 11-08-2010, 12:24 AM   #6
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spanning 18' with 2x6


play with this link for a little bit.

http://www.awc.org/calculators/span/...eversecalc.asp
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Old 11-08-2010, 10:55 AM   #7
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spanning 18' with 2x6


Yeah, I saw the online tables and calc pages, but didn't see anything for 4x ceiling joists. It looks like 2x8 would work. Kinda wanted to use the 4x. They also don't have 8" oc. I have 16" oc now, going 8" oc would be pretty easy.
Since I still have the old ones and they worked, I think I'll just put them back where they were and make some bigger replacements for the one or two that are damaged.
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Old 11-09-2010, 01:44 PM   #8
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spanning 18' with 2x6


another idea - you could use 6" 14ga perlins - plenty strong...
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Old 11-09-2010, 03:29 PM   #9
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spanning 18' with 2x6


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Yeah, I saw the online tables and calc pages, but didn't see anything for 4x ceiling joists. It looks like 2x8 would work. Kinda wanted to use the 4x. They also don't have 8" oc. I have 16" oc now, going 8" oc would be pretty easy.
Since I still have the old ones and they worked, I think I'll just put them back where they were and make some bigger replacements for the one or two that are damaged.
There has been no mention of 4x anything.
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