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Unread 04-03-2002, 10:03 PM   #1
bigpeat
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I am trying to find out the max span for 2x8 16" OC Doug fir sistered to existing 2x6 boards. CABO does not show any increase in span when sistering boards.

Thanks in advance.
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Unread 04-04-2002, 05:46 PM   #2
John Bridge
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Wish I could help. Never had much experience with 2x8s. I think you'll find, though, that the max span doesn't increase. It's just that the sistered joists can become a beam and carry shorter members coming into it or crossing over it. To increase span, you have to increase section (depth).
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Unread 04-05-2002, 10:00 AM   #3
Dave Ashton
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What does the cross section look like? How many 2x6's? How long is the span? Is it a residential or commericial floor? How is the stuff sistered together? Nails? How often? Glued?

Dont you love all these questions! If you answer them I can tell you.
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Unread 04-05-2002, 02:03 PM   #4
Bud Cline
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Join Date: May 2001
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Dave,

We need a proxy for CX while he's off in the New Mexico mountains playing with........

stuff.

John and I have no idea, so......

"Take it Dave"!!!
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Unread 04-05-2002, 06:52 PM   #5
John Bridge
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I only know that I had an argument with an architect/engineer way back when I was a framing contractor. He had specified squared off tree trunks for carrier beams on an apartment project we were doing. He had the idea that the larger the girth of the timber, the farther he could run it between supports.

I lost the argument originally, but before we finished we were pouring pads for intermediate columns, some of them in front of windows.

A built-up beam is a little different, but not much. The height of it is what's important. Additional width tends to keep it from trying to go sideways and tip over.

The so-called "engineered" beams and joists are the way to go.
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Unread 04-05-2002, 11:50 PM   #6
stullis
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Of course you can span further if it is sister or doubled up. How far? I don't know. My guess is that that set up would be similar to a standard 2X10 joist.

Width does make a difference but not as much as height.
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