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“Free Standing” mezzanines or “Work Storage Platforms” are not attached to the building other than being anchored to the floor. Because a mezzanine creates additional “floor” space, many municipalities will require a building permit. It’s a good idea to comply with local codes and obtain permits where necessary. Permit approval can range from accepting a manufacturer’s approval drawing for municipal files to requiring a “stamped” drawing with engineering calculations. |
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The two most common forms of decking are bar grate and a roof deck and plywood combination. Bar grate is generally more expensive per square foot, but installation time is less and may make up this difference. Where a sprinkler system is in use, bar grate can sometimes negate the necessity of adding sprinklers underneath. Local fires codes will dictate in this instance. The idea of not requiring lighting under a bar grate deck for the ground level is not valid as products stored block light and even unobstructed, bar grate seriously filters light. Roof deck and plywood decking keeps dirt from filtering to work stations underneath and provides a good rolling surface for hand carts or pallet jacks. Handrail is required where any open ledge exists. Where a mezzanine is placed against a wall, railing is not required. Voids can generally be filled in by cantilevering deck past outer beam or, if load bearing, cantilevering a load beam. In-Plant offices are commonly placed on top of a mezzanine. Handrails are only required at open spaces. Local fire or building codes will dictate when additional forms of exit are required. General construction will consist of 6” x 6” x 7 gauge columns with 12” base plates. I-beam framing and joists or bar-joists are common. Bar joists can be used in longer spans but have a deeper cross-section and where vertical space is limited are not practical. An I-beam can generally span up to 20’ from a practical standpoint. Longer spans require a deeper web. Irregular spacing of columns is okay when necessary to avoid ground level obstructions. The above is a general overview based on non-seismic areas. Mezzanine manufacturers are responsible for design based on seismic zones and should be made aware of individual requirements. Each state and/or municipality will have codes that require compliance so it’s best to consult with a professional knowledgeable of these structures.
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Typical information required for basic mezzanine design is:
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