On Sun, 21 Mar 2004 21:43:01 -0700, "Chuck"
vaguely proposed a theory
.......and in reply I say!:
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OK. My first serious reply.

Flat roof or gabled? Webbed or atrium/cathedral? Are you going to use
purlins?

Who is going to pin the bell on the cat?

You ask whether the material will sag under its own weight. Who will
walk around there putting the sheeting on? How much will they (you)
weigh?

It all gets messy. take a 100 X 50 RHS, and support it it at the ends.
Does it sag? If not then it won't. That's steel as distinct from
timber. It does what it will do. Now stand on it. Does it deform?
Deforming is not just bending. If it deforms it won't come back.

Now get 3 of them and build a mockup of the three 100 X 50 RHS beams
and the purlins between them. Walk around on that.

Then maybe go back to the tube makers and ask for specs. Also ask the
Shire/city.

Seriously. the makers have spans for beams, purlins, webbing, loads
etc.

Here is not the fair place to ask.


I'll be building a carport in the near future. I would like to make my own
frame to support the roofing panels. The span between the posts will be 20
feet. I'm thinking that some 2x4x.120 rectangle tube should be strong enough
for the horizontal, but what I need to know is will the tube sag under it's
own weight . Has anybody had any experience with this kind of framework
before, or is there some place you could direct me to find some answers?

Many Thanks,

Chuck in Phoenix


************************************************** ** sorry

..........no I'm not!
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