Mezzanine Floor Framing 4

[Michael55]

I am designing a small 1000 sf free-standing mezzanine floor for restaurant use. I am curious about the advantages of bar joist w/metal deck & concrete VS. W-Section w/metal deck & concrete. Any thoughts?
Thanks!

 

[AUCE98]

Mike,

I would assume that you would experiance more vibration issues with the bar joist/metal deck vs the W-section/metal deck option.

 

[SteveGregory]

Steel delivery may be quicker that bar joist delivery

 

[jike]

Everything depends upon span and load. Shorter spans: cold rolled joists or beams. Longer spans: Open web joists. Obviously OW joists eat up more headroom.

You might want to consider using a pre-fab mezzanine (google it).

All kinds of decks may be used. Cheapest is usually plywood over metal roof deck. Wood use may downrate your building so be aware of that.

 

[Michael55]

The floor area is essentially 20'x50'. Bar joists would span 20' or I could have an intermediate girder and span 10' and 10'. Just wanted you guys' thoughts....THANKS!

 

[Lion06]

I second AUCE's post. The bar joists would likely be problematic for vibrations, especially if being used for a dining area.

 

[jike]

If it is a dining area, rather than storage, then you might like the more solid feel of concrete on deck. Plywood will give and feel more like a resident than a commercial property.

 

[Michael55]

Yes I am definitely going to specify conc on decking. It seems that wide flanges will be a better choice than bar joists for both vibration concers and a quicker fab time. I now will need to figure an economical framing spacing and deck sizing. Do you guys think composite decking makes sense for something this small?

 

[msquared48]

If you have any headroom problems, the composite construction will save steel with lower allowable depths.

You have to have a welder on-site with the metal deck welding anyway, so use the steel studs, partial composite should be sufficient.

Mike McCann
MMC Engineering

 

[jike]

Composite deck is OK but I would not use composite framing for these short spans (20'). I also believe that with these short spans transient vibration would likely not be a problem.

 

[vandede427]

If you're only spanning 10', I would use cold-formed joists (you don't want to call out a bunch of 10K1's).

 

[dm3415]

Keep in mind OWJ are easier on the trades, such as the HVAC guys and those hole crazy plumbers.