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Old 11-24-2009, 01:12 PM   #1
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how to span dance floor without support columns

How would I span a dance floor roof, flat concrete roof without using support columns, just load bearing walls. the room size is 104'X70'. I thought of using steel i beams in the longest lenght 104' then using 2x10 wood joists to connect to i beams. or use steel web joists. If I use steel web joists what spacing do I use?


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Old 11-24-2009, 01:14 PM   #2
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steel beam

This is for a student in my class who is designing a dance floor. I want him to be as accurate as possible.


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Old 11-24-2009, 01:23 PM   #3
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Bar Joists in the 70 ft dimension

Even 70 feet is a loonngg span. Investigate using the style of bar joists with bolts welded to the top chord which get encased in the concrete roof deck when it is poured. I think these are called bulbs, but I might be wrong.
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Old 11-24-2009, 01:25 PM   #4
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This WAY beyond DIY, which is what this site is for
Consult with a Pro
Thank you
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i beam span , steel web joist spacing

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