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When we talk about the Dimensions of
your mezzanine, we are mainly talking about the
Length and Width; the size of the square or
irregularly shaped area where you plan to expand
upward. |
22'-6" Wide x 34'-9" Long |
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When you hear the expression "hold that
dimension," that usually means that we can go no
longer or no larger than this size or length,
whereas typically dimensions are given in a round
about format, allowing a little bit of leeway in
order to make the project slightly more economical
and cost efficient. |
22'-6" Wide x 34'-9" Long
(Hold Width) |
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The Clear Height refers to the distance
from the floor to the bottom of the mezzanine
structure. So if there are certain objects you
have that you want your mezzanine to "clear," your
clear height would be just slightly taller than
those objects. |
8'-6" Tall Shelving Below Mezzanine =
9'-0" Clear Height |
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The Deck Height, as I'm sure you've
guessed, is the very top at which the decking (the
part you walk on) of the mezzanine will be. So
if you have a a very short ceiling, the Deck Height
can be a very crucial component of your new
mezzanine structure. |
20' Ceiling w/
8' Clearance =
12' Max Deck Height |
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The Decking is the part you walk on of
the mezzanine, and will vary greatly depending on
the application of your mezzanine. Some
standard types of mezzanine decking are Bar Grating,
Plywood, Diamond Deck (Steel alloy) and Ergonomic
Tred. |
To let light through to underneath Mezzanine:
Bar Grating Deck |
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Column Spacing is an often initially
overlooked spec that is extremely important.
This determines where the columns that span from the
floor to the bottom of the mezzanine structure in
order to support the majority of it's weight.
It is VERY important to know where the columns fall
in order to make the best use of your new workspace
and the key is plan ahead and around your space |
10' x 12' Shelving Below Mezzanine =
10'-6" x 12'-6" Minimum Spacing |
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The last and possible most important
spec to consider is your load capacity. What
do you intend to use the mezzanine for? How
much weight will you be putting on it? All
mezzanines are required to be built to sustain at
LEAST 125 PSF (pounds per square foot), which
handles most uses, but better safe the sorry! |
5' x 5' Shelving Storing 2,500 lbs = 100 PSF |
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While deflection is not typically a
specification that one would change, it is important
to know what it is. This refers to the amount
that the steel girders or bar joists that are
supporting the underside of the mezzanine will
deflect given they are tested at the the maximum
amount of load capacity, and the amount is usually
referenced by the percentage of fall per length of
the girder or joist. The industry standard is
1/360 span. |
A 15' beam at 1/360th deflection over span would
give roughly 1/2" of bend under maximum pressure. |
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This is another spec that the end user
doesn't get to pick, but must be aware of while
planning his mezzanine project. This is the
amount of pressure exerted from the columns
supporting the mezzanine to the floor where they are
attached and is represented in PSI (Pounds per
square inch). If your floor surface is not
strong enough to support the specified weight, a
concrete footing would have to be poured underneath
each column to facilitate the mezzanine. |
A 6" x 6" column base-plate supporting 5,000 lbs
might exert about 139 PSI of floor load. |
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