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Re: Commercial Bldg. - Second Floor Loads

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In regard to the design of floor supports for mezzanines in a commercial building, the practise in Ontario is 
to look at what the mezzanine is to be used for.  If it is for assembly purposes, you have to design for 100 
psf min.  Hence, my understanding is that the area would be relatively open?  You choose whether to allow 20 
psf for any partitions which may be built, but whose locations are unknown or, if the partition locations are 
known, then design for the actual weight.

The term mezzanine is rather vague.  In a commercial building, a mezzanine could be used for storage (100 psf 
min.) or maybe even archival storage.  For archival storage, I would design for 150-200 psf or more and 
forget about the  partitions.

If it is intended for, say, additional open office space, it could
theoretically be designed for 50 psf live load and 20 psf partition
allowance.  You would have to be able to justify this, as the building officials know that the use of 
mezzanines can change and they tend to want 100 psf live load min.  I don't think they would accept 80 + 20 
if it is apparent that partitions may be installed in the future.

Incidentally, wouldn't the floor in a commercial building be concrete?  Your dead load of 14 psf is low, or 
is that just the superimosed dead load.

Gary L. Hodgson, P.Eng.
Niagara Falls, ON


> Hello all you engineers who design commercial buildings all day long.  
> I am designing the beams for a mezzanine in a commercial building and I 
> am confused about what loads I should use. 
>         Floor DL = 14 psf
>         Floor LL =  100 psf
>         Partitions = 20 psf
> The floor framing is 14" TJL (open-web) at 16" o.c..  I talked to the
> Trus-Joist rep. yesterday and he said he designs the trusses using only
> (14 
> + 
> 100) psf (no partition load) because live load and partitions cannot
> occupy 
> the same space.  Makes sense to me.  So do I design my beams with the
> same load criteria or use (14 + 20 + 100) psf ??  Don't laugh.  This is
> serious. 
> I usually design one-story residences and it's been a long time since my
> last commercial job. Plus, I called another engineer in the area and got
> conflicting information.
> TIA,
> Denise Poeltler, P.E.
> The Flying Buttress

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