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I want to convert my loft and need to span 9 meters unsupported. Can it be achieved without steel beams?

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9 x ?, how deep? –  HerrBag Jun 28 '13 at 16:04
    
Have you looked at "lightweight structural" steel beams? –  auujay Jun 28 '13 at 17:01
    
Do these need to support a load? Or is it just for the ceiling? –  Chris Cudmore Jun 28 '13 at 17:52
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I just checked some Ontario tables. For an Attic, not accessible by stairs (i.e. not used as living space, a 2x12 every 12" can span 32 ft. But you can't put anything above it.

I've found nothing in the tables that allows a 30 ft span supporting a floor.

While this doesn't mean it can't be done, it means you need to consult with an engineer, and pay for a proper design.

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I think for a span like that you need to look at engineered joists if not an I beam. –  auujay Jun 28 '13 at 16:54
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