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Need beam for a 22-foot span. It's a carport. What to use? (beehaw.org)

submitted 7 months ago by TheBaldness@beehaw.org to c/diy@beehaw.org

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I'd like to build a carport. It will basically just be a shed roof extending off the front of my garage. I'll need a beam, as thin as possible, to span 22 feet from side to side.

It looks to me like steel is the only thing that could easily do that, but the cost is high, and how thick does it have to be? I priced out some 6" i-beams. $500 each. How do I attach wood to those? Can't exactly nail into them.

That brings me to LVLs and such. Less pricey, but very thick. I suppose I could double up on a couple of thinner ones (like 6") but they don't seem to be rated for exterior use, and I'm pretty sure a carport would be considered exterior use, even though they'd be under a roof.

Any guidance?

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[–] TheBaldness@beehaw.org 2 points 7 months ago* (last edited 7 months ago) (1 children)

A flitch beam sounds interesting. The problem with 2-by timbers, like 10x2 or 12x2, is their thickness. A 12x2 would drop down 12 inches, and the highest point of my carport is only 8-feet high. In its 16-foot run, it has to drop at least 4 inches in order for water to run off. I can't be using material as thick as 12x2. That's why I was considering doubling or tripling some engineered wood. But at that point it seems like steel would be the same cost and better performing. I dunno. Like you said, I may have to talk to an engineer.

[–] oo1@kbin.social 4 points 7 months ago

yeah, glulam is probably a non-starter too if there's no height available.
I think you can do triple flitch.

So like : [w]|[w]|[w]
maybe that'd work with 3 2x6s , 2 steels, all boted together.