There are too many variables for anyone to rightfully size any support online. Even if you were told the size of the beam by someone here, how can it be trusted when they have not seen the site? When the span is increased, the point loads have to go somewhere. That's what the engineer is for. They take responsibility for the new design after they accounted for the site variables, that's why they cost so much.For my current addition project I am using a slightly shorter span than the one you want.
If you don't mind, I would like to ask JKlingel if there are any people on here who *are* able to help us navigate the W-Beam ratings, BEFORE we go to an engineer for a final approval.
I don't mean to come off as irreverent here, but if we can put a man on the moon, seems to me there must be an outside chance that some DIYers have probably found some kind of table that would simplify all the mathematical complexities.
Heck even when I did go and see an engineer on my first design (which used 1 support post under a 35' span), even HE relied on a software program.
Hey, I'm a newbie too. And I hate to be the bearer of bad news but what I can tell you is - as far as I know, steel suppliers have to special order anything longer than 40 feet.
OK, you asked, so here is my opinion. I don't think anyone who is concerned with your safety and their butts will take a stab at this online. Dan Holzman is an engineer here, so you may get a reply from him. You can find engineering-type books at the library, and/or ask at a steel yard. I think you may be talking truss more than beam.If you don't mind, I would like to ask JKlingel if there are any people on here who *are* able to help us navigate the W-Beam ratings, BEFORE we go to an engineer for a final approval.
I'm not quite sure what you're "just askin'"... Often, design has to be an iterative process with structural analysis beginning from an early stage. If you get to final drawings or permitting and discovered that you had the wrong beam size... something went wrong in the process a while back. That IS the danger of recommending BeamChek, for example: someone who doesn't know how to calculate the loads does it wrong, proceeds with the rest of their plan development, and then tries to get an engineer to stamp them, only to discover a major redesign is required.Suppose a necessary 2 inch elevation change for the proper beam unattractively altered the final profile. Would you throw in complimentary drafting time, or would you charge another $600 for some intern to tweak my AutoCAD dwg for an hour?