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Old 10-17-2010, 08:32 PM   #1
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2x6 spanning 18' is this going to be a problem?


I've replaced the ceiling support that were redwood with doug fir, both are 2x6, the redwood was spliced to make the span of 18'. The doug fir was 24' cut to fit.
They are 16"oc and when I set up some 3/4" plywood as temp work platforms, they seem to bend down a bit whereas the old redwood didn't seem to do that.
I noticed the "2x6" of today is different than the "2x6" of 70 years ago. I also added 14.5" stubs inbetween each support (both ends and middle). I'm under 200 lbs and the plywood has 6 supports under them. If I put the plywood near the edge, it seem more stable.
I'm using 2.5" nails to hold the stubs and plywood.
The lumber yard said the doug fir would be stonger than the redwood that I'm replacing.

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Old 10-17-2010, 11:30 PM   #2
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2x6 spanning 18' is this going to be a problem?


Trees from yesteryear are gone........ http://www.awc.org/calculators/span/...orizontal+Span

Gary

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Old 10-18-2010, 12:27 AM   #3
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2x6 spanning 18' is this going to be a problem?


From the calculator, even though I'm replacing what's there now, it's not up to par. I have to assume the grade and some other factors as I don't know what loads will be on there. It was fine before, now I might need a load bearing wall in the middle.
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Old 10-18-2010, 09:50 PM   #4
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2x6 spanning 18' is this going to be a problem?


Actually I still have to old ceiling in place so I could just reuse the old supports as "in betweens" then I'll have 8" oc... Kinda a waste but I'm not doing anything with those old ceiling supports anyways. I did notice these old boards were a different size compared to new boards, much thicker. Maybe I should have used 4x6 instead.
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