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Old 07-25-2008, 02:02 AM   #1
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steel beam length

I am trying to figure out what the smallest steel beam possible is to span 28' while supporting a deck with a dead load of 300 lbs and live load of 1200 lbs. The deck will be supported at one end by this beam and at the other end by a wall to my house which is quite sturdy. The decking will be redwood 2x6s that extend from the house to the beam. Is a W8x10 too small? It's a long span, but the steel beam won't be expected to support much weight. Is there such a thing as a W10x10? I'm just looking for a ball park estimate. Nobody at the place where I buy my steel speaks english very well so I can't get even a rough guess.


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Old 07-25-2008, 07:39 AM   #2
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I'd strongly suggest contacting a structural engineer for this task.


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Old 07-25-2008, 08:02 AM   #3
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Your load looks low, but you did not provide enough details like deck size and location. Is that total loads or per foot loads?

Strength is one thing. At 30' long, you will probably have more problems with deflection and a springy deck.

Not for an amateur to design.

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Old 07-26-2008, 11:28 PM   #4
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you do need an engineer but a ball park figure for what you are thinking of is half your span in feet.... in inches of beam....this is no formula for substituting an engineers stamp but i think it will be close to a 14 inch beam of medium weight

28 feet devided by 2 = 14 feet = 14 inch beam
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Old 07-27-2008, 08:11 AM   #5
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Try another supplier. Most have a service to provide you with the calculated beam dimensions, and engineer-stamped specs, which may be required in order to get, and approve, a permit and inspection.
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