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I am volunteering at a local organization wanting a office added on the opposite side of an already existing wall (steel Construction). What they are wanting me to do is basically frame a parallel wall 12ft from that and then add ceiling joists across so that the room created will have a 8ft ceiling in a 14' room. they would like the extra 3.5ft above to be usable for storage of course my concern with this is would it be safe for people to stand on this 144sqft space when storing goods considering that it will all be held up by steel construction (they were donated a huge amount of steel studs)
 

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The steel construction would need to be steel "I" beams rated at the required pounds per square foot, I think.

I did the similar project. But I had a steel company build the mezzanine out of steel and I built the office and break room underneath.

The mezzanine was framed with steel "I" beams resting on steel posts with a corrugated steel floor above. I framed everything with steel studs, drywall and drop ceiling.

For the mezzanine floor, I screwed some 1" x 4" boards to the steel and 3/4" ply to the 1x4's.
 

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"they would like the extra 3.5ft above to be usable for storage of course my concern with this is would it be safe for people to stand on this 144sqft space when storing goods considering that it will all be held up by steel construction"

I've never met a building official that would allow this even if it just "storage". Mezzanines, second floors, regardless of what they are or aren't used for require similar live/dead load requirements as occupied space. Not to mention the AHJ would then consider this space/building having multiple uses.

QCCI, you placing concrete over the decking?
 

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GCTony said:
"they would like the extra 3.5ft above to be usable for storage of course my concern with this is would it be safe for people to stand on this 144sqft space when storing goods considering that it will all be held up by steel construction" I've never met a building official that would allow this even if it just "storage". Mezzanines, second floors, regardless of what they are or aren't used for require similar live/dead load requirements as occupied space. Not to mention the AHJ would then consider this space/building having multiple uses. QCCI, you placing concrete over the decking?
Yes, 3" normal weight concrete 4,000psi, over 9/16 - 26 ga form decking, with 6-6-W1.4xW1.4 WWF reinforcing. Actually we did that job about early last year, just thought it would shed some light on the topic.
 
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