Industrial Structures Specifications

Work Platform (Mezzanine) Specifications


Work platform (mezzanine) shall be of the freestanding type; constructed of zinc coated (galvanized) steel, bi-directional rigid frame design such as the Industrial Structures work platform (mezzanine) manufactured by the Industrial Structures Group of Western Pacific Storage Systems, 300 East Arrow Highway, San Dimas, CA 91773.

The system shall be custom designed for the uniform live load specified by the end user and in accordance with UBC, OSHA, BOCA and other local codes that may affect design.

Work platform (mezzanine) must be easy to assembly and disassemble for ease of relocation with use of hand tools. Manufacturer must verify a minimum of ten (10) years experience in manufacturing and designing work platform (mezzanine) systems, and be a licensed fabricator requiring independent jurisdictional inspection.

Work platform (mezzanine) manufacturer shall provide warranty for all products to be free from defects in material and workmanship for a period of one year minimum. System design, specifications and calculations shall be made under the supervision of a registered professional engineer licensed in the state in which installation and building permit are required.


The successful bidder shall supply drawings by a qualified designer showing size and height of work platform (mezzanine), column location, size and orientation of baseplates (assuming soil and slab information to be provided by customer), type of decking, design load and deflection under design live load.

The number of support columns shall be held to a minimum to utilize space under the proposed structure. No cross or knee bracing of any kind may be used.

Steel framing members must be cold formed from G60 galvanized, ASTM A446, grade D, high tensile steel with minimum yield strength of 50,000 PSI.

Tolerance of +/- 1/8″ must be held.

The system shall be engineered in accordance with the following references:

AISI: Specifications for the design of cold formed steel structural members
AISC: Specifications for the design, fabrication and erection of structural steel for buildings
ASTM A446: Steel sheet, zinc coated (galvanized)
ASTM A490: For high strength bolts
UBC: The current Uniform Building Code in effect


Galvanized Rigid Frame System: All steel framing members must be cold formed from G60 galvanized ASTM A446, Grade D, high tensile steel with minimum yield of 50,000 PSI.

Galvanized Tapered or Square Columns

Tapered Columns: come in 12″, 16″ or 20″ columns tapering down to 5″ at the base, welded to a minimum 12″ x 12″ x 1/2″ baseplate. The baseplates are secured with four 3/4″ epoxy or wedge anchors. See individual city requirements for type and embedment.
Square Columns: 9″ square, welded to a minimum 14″ x 14″ x 1/2″ baseplate. The baseplates are secured with four 3/4″ epoxy or wedge anchors. See individual city requirements for type and embedment.
Beams: “C” or “Z” shapes, come in 12″, 16″, or 20″ sizes and are 10 or 12 gauge, typically. Connections are made with ASTM A490 3/4″ HD bolts (non-galvanized per manufacturer’s specifications).
Struts: “C” shape, standard in 12″, 16″ or 20″ sizes and are either 10 or 12 gauge, typically. Connections are made with ASTM A490 HD bolts.
Joists: “C” shape, 8″, 10″, 12″, 14″, 16″ or 20″, and are 14, 12, or 10 gauge, typically. Connections are made with “L” shaped clips and 5/8″ bolts.

Decking Options

Wood over B-Deck: 3/4″ or 1-1/8″ HD fiberboard over 1-1/2″ galvanized B-Deck in 18, 20 or 22 gauge. Secured with #12 x 3/4″ tek screws and #9 x 2″ bugle head tek screws.
Diamond Plate: 1/4″, 3/16″ or 1/8″ galvanized, painted or plain diamond plate over 1-1/2″ galvanized B-Deck. Secured with #12 x 3/4 tek screws and #8-32 x 1″ truss head screws.
Bar Grating: Standard 1″ x 1/8″ galvanized or painted bar grating secured with galvanized saddle clips and #12 x 1-3/4″ tek screws.
Plank Pak: 2″ x 9″ nonskid galvanized surface features embossed dimples with traction holes. Secured with j-bolts/clips and #12 x 3/4″ tek screws.
Concrete: Galvanized concrete form decking, secured with #12 x 3/4″ tek screws. After installation the form is filled with concrete by others.

Stairs and Landings: meet OSHA, UBC and BOCA requirements. Nonskid treads, stringer, landing and handrail are all galvanized. Options for ADA/Title 24 and EX stairs. See local building department for location and number of stairs required.

Guardrails: feature post and sleeve system with 1-5/8″ x 14 gauge galvanized posts welded to 6″ x 6″ x 3/8″ baseplates with four (4) 7/16″ holes for 3/8″ bolts. Rails are 1-5/8″ x 17 gauge galvanized pipe in six foot lengths to be field cut to exact length. Custom powder-coated colors available.

Gates: welded 1-5/8″ galvanized pipe, available in swing or sliding designs. Standard widths are 4′, 5′, 6′ and 8′. Custom sizes and powder-coated colors are available.