Pergola with curved beam

bill_g_web(z9 CA)May 7, 2006

Has anyone built a pergola with a curved beam? I suppose the way to make the beam is to laminate 5 or 6, 1" boards together, using outdoor glue. (The curve is gentle enough that 1" board might work. If nbot, I'd just have to go thinner.) Maybe once the columns are in, I could use them somehow as the form for gluing up the beam laminations. Any thoughts? Other methods?

Thanks,

Bill

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nathanhurst(VIC Aust)

Some other ideas: Cut the curves from an already curvy branch (this will be stronger), cut the curves from a larger piece of wood (say ply). Steam bending.

Steam bending is the traditional way for load bearing beams, but that was before the invention of power tools and cross linking PVA glue.

You won't be able to get a good curve using only the columns (and you'll have trouble with them moving under the force). Better to make a curved former out of ply or MDF and use lots of clamps (like 1 every foot). There will be a lot of force applied for the first few laminates, so you'll need the former to be very strong. A good idea is to cut the shape in thick board then drill 1inch holes every foot to put your clamp in.

I'm surprised that you can bend 1 inch wood, but my US friends tell me that your hardwood is lot less stiff than here, so it might work.

    Bookmark   May 7, 2006 at 5:58PM
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utsharpie(33014)

how much of a curve?

    Bookmark   May 8, 2006 at 12:39PM
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bill_g_web(z9 CA)

I'm guessing a radius of about 6 feet - nathanhurst is right, 3/4" is too thick to make that turn, unless it's green and steamed. I guess what I'm looking at is 1/4" boards, built up to a beam of about 3 1/2", unless you've got another suggestion.

(I might try wandering in the woods to see if I find something natural to work, but that's a long shot. I've tried steam bending wood for a snoeshoe project and I don't really see that working out for this application.)

Thanks,

Bill

    Bookmark   May 12, 2006 at 5:51PM
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brendan_of_bonsai(4b AK)

Steambending would work well for this project, assuming a radius of 6, (I have no idea what a pergola is) I can definitely see 1/2" ash making that kind of a bend id steamed, they do it in boat building all the time, Ash is the wood of choice for mking a fair curve like the one you want/need. I also like the idea of cutting it out of a large curved branch or trunk, I suggest Titebond III, I've read Rave revieds in a few wood working publications including Tautons Fine woodworking.

    Bookmark   May 12, 2006 at 11:44PM
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mark_nova(6/7 Snst32 AHS7)

Does anyone know of places you can -buy- curved beams?

    Bookmark   May 20, 2006 at 4:24PM
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bindersbee(6a UT)

Would you consider using Trex for at least this portion of the project? Trex isn't great for really heavy loads but should be able to handle the load of a Pergola. I do know that it bends easily as we have done that on a playground project I worked on. I would also like to build a curved front pergola and Trex seems to be the easiest solution so long as I don't want a white pergola (which, of course, I do).

    Bookmark   June 25, 2006 at 10:49PM
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nathanhurst(VIC Aust)

Can you bend trex with a heat gun?

    Bookmark   June 26, 2006 at 1:49AM
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