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Wildeck Mezzanines

A steel mezzanine adds usable floor area inside the building you already lease — no foundation, no roofline change, and no second facility. This covers structural types, load ratings, code requirements, access equipment, and what a project actually involves start to finish.

Wildeck steel mezzanine platform with resin board decking and yellow perimeter guardrail in a warehouse

2×

Usable floor area from the same footprint

125 psf

Common design live load for storage decks

IBC

Code-compliant engineering and stamped drawings

Free

Layout and feasibility consultation

Why a MezzanineHow They’re BuiltDecking OptionsLoad RatingsCode RequirementsAccess & Material MovementSafety EquipmentApplicationsProject ProcessCost DriversFAQs

The Cheapest Square Footage You Will Ever Buy

Most industrial buildings are leased by floor area and used by floor area, while twenty or more feet of
clear height above the racking does nothing at all. A mezzanine converts that air into floor — a
free-standing steel structure, engineered to a live load, built inside the existing shell.

Compare the three ways to get more space. A new building means land, design, permits, construction, and
a year. A second lease means rent, duplicated staff, and material moving between two sites forever. A
mezzanine means a few weeks of installation inside a building you already pay for, and no change to your
roofline, foundation, or lease footprint.

Wildeck is one of the established U.S. manufacturers of structural mezzanines and vertical lifts, and
their systems are engineered per project rather than pulled off a shelf — which matters, because the
column layout has to miss your rack, your aisles, and your existing sprinkler mains.

Free-standing steel mezzanine platform with yellow railings inside a warehouse
A free-standing structure: it carries its own load to the slab, not to your building shell.

Run the numbers against your lease rate before anything else

Take the square footage a mezzanine would add and multiply it by your annual cost per square foot. For most operations in Salt Lake City, Boise, Denver, Phoenix, or Las Vegas the mezzanine pays for itself against avoided rent well inside its useful life — and it stays with you if you ever relocate.

Structural Types

The right structure depends on what is going on the deck, what is going under it, and how much column interference you can tolerate at floor level.

Free-standing Wildeck steel mezzanine over open distribution center floor with yellow guardrailFree-Standing StructuralColumns, beams, and joists carrying load directly to the slab. The most flexible option: the space underneath stays completely open and usable, and the structure is independent of your building. The default for most projects.
Rack-supported Wildeck mezzanine deck carried on carton flow racking belowRack-SupportedThe pallet rack itself carries the platform above. Extremely efficient where the ground level is going to be racking anyway, but it locks your rack layout in place — moving the rack later means re-engineering the deck.
Shelving-supported mezzanine with two tiers of steel shelving rows and an elevated walkway deck between themShelving-SupportedShelving units act as the structure, with walkways between them. Common in records archives and central supply where the whole footprint is shelving and you want two or three tiers of it.
Modular office building constructed on a mezzanine platform inside a warehouseOffice / In-Plant CombinationA mezzanine deck carrying modular offices above, with more offices or storage below. This is how you add supervisory space overlooking the floor without giving up any production area.
Multi-tier Wildeck mezzanine with two stacked levels of platform above warehouse storageMulti-TierTwo or three stacked levels where clear height allows. Cost per square foot drops with each tier because the columns and foundation work are already paid for.
Custom Wildeck elevated equipment work platform giving maintenance access around machineryEquipment and Work PlatformsSmaller elevated platforms for machine access, tank and mixer service, and maintenance walkways. Same engineering discipline, much smaller scope.

Decking Choices

Decking affects load rating, fire code compliance, noise, and cleanability. It is also one of
the easiest places to over- or under-spend on a mezzanine project.

  • Bar grating — open steel grid. Lets sprinkler water and light through, which often simplifies fire protection design. Highest capacity per pound, but small items and liquids fall through and it is loud underfoot.
  • Steel deck with concrete fill — the premium option. Quiet, flat, easy to clean, and the best choice for offices, forklift traffic, or anywhere people spend the day. Heaviest, so it drives the structure.
  • Resin-impregnated composite board — solid, smooth, and quieter than grating at far less weight than concrete. The most common general storage deck.
  • Plywood or B-deck with overlay — economical for light storage where appearance and fire penetration are not concerns.
  • Diamond plate — slip-resistant steel for maintenance platforms and wash-down or oily environments.

The sprinkler question decides this more often than anything else. Solid decking above a
sprinklered floor generally requires sprinklers under the mezzanine as well; bar grating frequently does
not. That single line item can swing a project budget more than the deck material itself.

Wildeck mezzanine deck with bar grating decking and cartons staged on the platform
Ask about sprinklers before you choose decking — it can outweigh the deck cost itself.

Load Ratings: The Number That Drives Everything

A mezzanine is designed to a live load in pounds per square foot. Under-specify it and the structure limits your business; over-specify it and you pay for steel you will never load. Get this number right at the concept stage, because changing it later means re-engineering.

Design Live Load Typical Use What It Supports Notes
50–75 psf Office and light occupancy Desks, people, filing Code-driven minimum for occupied space; confirm the occupancy classification
100 psf Light storage and general access Boxed goods, light shelving Often too light for real warehouse storage — verify before accepting it
125 psf General warehouse storage Palletized goods, shelving, hand carts The most commonly specified storage rating
150–200 psf Heavy storage Dense product, heavy shelving, pallet jacks Specify if pallet jacks or heavy dense product will be on the deck
250 psf and above Industrial and equipment Machinery, forklift traffic, bulk material Requires concrete-filled deck and heavier framing; engineer it explicitly
Point loads Specific equipment Presses, tanks, mixers Must be called out separately — a uniform psf rating does not cover a concentrated load
Underside view of Wildeck mezzanine beam and joist framing that carries the deck load
Occupied space carries different code obligations than storage — decide early.

Three load questions people forget

What is going under it? Column placement has to miss your rack rows, aisles, and dock
approach. This is where a layout drawing earns its keep.

Will a lift truck ever drive on it? If there is any chance, say so now. Forklift-rated
decks are a different structure, not an upgrade you bolt on later.

Will it become occupied space? Storage decks and occupied decks carry different code
requirements for egress, fire protection, and accessibility. Converting a storage mezzanine into offices
after the fact is expensive; designing for it up front is not.

Code and Permitting

A mezzanine is a structure, and it gets permitted like one. This is the part of the project that surprises buyers who thought they were purchasing equipment. Handled properly it is routine; handled late it delays everything.

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Stamped engineering drawings

Sealed by a professional engineer licensed in your state. Required for permit in essentially every jurisdiction, and it is the deliverable your building department will ask for first.

🏗

IBC compliance

The International Building Code governs mezzanine area limits relative to the room below, egress, guardrail heights, and stair geometry. Area limits are the constraint most often discovered late.

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Egress and stair count

Above certain areas or occupant loads, two means of egress are required and they must be remote from each other. That is a layout decision, not an accessory purchase.

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Fire protection

Solid decking above a sprinklered area generally triggers sprinklers underneath the mezzanine. Bar grating often avoids it. Confirm with your fire marshal before selecting deck.

🌎

Seismic design

Utah, Idaho, Nevada, and much of the Intermountain West carry meaningful seismic loading. Anchorage and lateral bracing are engineered to local criteria, not to a catalog standard.

♿

Accessibility

If the mezzanine becomes occupied space, ADA requirements may apply to access. Determine the occupancy classification at concept stage, not after the steel is up.

The two constraints that kill late-stage projects

First: IBC limits mezzanine area as a proportion of the room below, so “we will just make it bigger” is often not available. Second: slab capacity. A mezzanine concentrates load into column base plates, and older or thin slabs sometimes need footings cut in. Both are checked in our feasibility review before you commit to anything.

Getting People and Product Up There

A mezzanine with bad access is storage nobody uses. Budget the access equipment as part of the project from day one — it is routinely the difference between a deck that earns its cost and a deck that collects dust.

Access Method Moves Best For Consider
IBC stairs People Primary and secondary egress on any mezzanine Geometry, handrails, and landings are code-prescribed — not adjustable
Ship’s ladder People Secondary access on small platforms only Not acceptable as primary egress for occupied space in most jurisdictions
Vertical reciprocating conveyor (VRC) Material only Pallets, carts, and bulk between levels Far less expensive than an elevator and not subject to elevator code — but people may never ride it
Freight elevator People and material Occupied mezzanines with heavy traffic Highest cost, elevator code, permitting, and ongoing inspection obligations
Pallet drop gate Pallets by lift truck Loading the deck edge directly from a forklift Requires a rated safety gate so the edge is never open while someone is working
Conveyor Product flow Continuous flow operations between levels Integrate into the deck design up front; retrofitting a penetration is expensive
Wildeck IBC-compliant welded steel mezzanine stairs with handrails and landingIBC StairsCode-compliant stairs with handrails, landings, and prescribed geometry. Every mezzanine needs at least one, and many need two remote from each other.
Portable folding mezzanine ladder with wheels, handrails, and grated stepsFolding Mezzanine LaddersPortable ladders for secondary and maintenance access on platforms where a full stair is not justified. Available in 60 and 120 inch heights.
Yellow spring-loaded rolling ladder with anti-slip stepsRolling LaddersSpring-loaded rolling ladders for reaching upper shelving on the deck itself. Locks under weight and rolls when unloaded.

Guarding and Safety Equipment

Fall protection on an elevated deck is not optional and it is not an accessory. These items go
into the original scope, because retrofitting guarding onto a finished deck always costs more and often
requires re-engineering the edge.

  • Perimeter guardrail at code height on every open edge, with midrail and toeboard where required
  • Wire mesh infill where small items could be kicked off the edge onto people below — a common and expensive oversight
  • Rated safety gates at any pallet drop or loading point, designed so the edge is never open while an operator is working
  • Column protection at floor level wherever lift trucks operate near mezzanine columns — a struck column is a structural problem, not a cosmetic one
  • Rack netting or panels along the deck edge and above aisles where product could fall through
  • Signage and load placards stating the design live load, posted on the deck as most jurisdictions require
  • Lighting under the deck — the space beneath a mezzanine goes dark, and dark aisles create their own incident history
84-inch steel square safe handrail with wire mesh infill mounted on a platform edge
Wire mesh infill keeps small items from being kicked off the edge onto people below.
Yellow steel safety handrail with vertical posts and horizontal railGuardrail SystemsCode-height perimeter railing with midrails and toeboards, in bolt-down or weld-down configurations.
Safety netting installed along a warehouse mezzanine edgeRack and Mezzanine NettingContainment netting along deck edges and above aisles where falling product is the risk rather than falling people.
Wildeck rated safety swing gate installed at a mezzanine pallet drop openingSafety Gates and BarriersRated gates at pallet drop points and aisle entries so an open edge is never left unguarded.

Where Mezzanines Get Built

Application Typical Design What It Solves
Warehouse storage expansion Free-standing, 125 psf, composite deck Doubles storage area without a lease or a building addition
Order picking and pack out Free-standing, 125 psf, stairs plus a VRC Puts slow-moving picks above the floor and frees ground level for fast movers
Manufacturing support and WIP Free-standing, 150–250 psf, steel deck Buffer storage and subassembly right above the line instead of across the plant
Offices overlooking the floor Deck with modular offices, 50–75 psf Supervisory visibility without consuming any production floor
Records and archives Shelving-supported, multi-tier Two or three tiers of shelving in the footprint of one
Equipment and tank access Work platform, diamond plate Safe, permanent maintenance access instead of ladders and scaffolding
Retail and distribution backrooms Free-standing, composite deck Seasonal and overflow inventory off the sales floor and out of the aisles
Aircraft and vehicle maintenance Free-standing, heavy duty Tool and parts storage overhead, with the bay below completely clear
Modular in-plant office built under a warehouse mezzanine deck with access stairs
Offices above, production below — no floor area given up.
Wildeck mezzanine platform installed above an active warehouse floor and racking
Every project starts with an audit of what your clear height is actually doing.

What a Project Involves

1

Site visit and feasibility

We measure clear height, check obstructions, review your slab, and locate sprinkler mains, lighting, and HVAC. This visit is what determines whether the concept is buildable as imagined.

2

Layout and load definition

Column grid placed to miss your rack and aisles, live load set to your real product, access method selected, and decking chosen against the sprinkler question.

3

Engineering and stamped drawings

Sealed drawings by an engineer licensed in your state, including anchorage and seismic design to local criteria.

4

Permit submittal

We supply the drawing package and specifications your building department needs. Permit timelines are jurisdiction-dependent and should be assumed to be the longest lead item after steel.

5

Fabrication and delivery

Steel is fabricated to the approved drawings. Lead time depends on scope and current mill and fabrication conditions — we quote it honestly rather than optimistically.

6

Installation

Our crews install around your operation, typically zone by zone and off-hours where needed, so the building keeps running. Guardrail, gates, and access equipment go in with the structure.

7

Inspection and handover

Final inspection, load placards posted, and a walkthrough covering load limits, gate operation, and what not to do with a mezzanine column.

What Drives the Cost

We will not print a price per square foot, because the honest answer is that the same deck area
can vary by a factor of three depending on the decisions below. What we will do is tell you which of these
is driving your number so you can make a real trade-off.

  • Live load rating. The largest single driver. Going from 125 to 250 psf changes every member in the structure.
  • Decking type. Concrete fill is the premium; bar grating is the economy option — but see the sprinkler note, which can reverse that.
  • Fire protection. Sprinklers under a solid deck are frequently the largest surprise line item on the whole project.
  • Column spacing. Longer spans to keep the floor below clear mean heavier beams. Clear floor area has a price.
  • Access equipment. A VRC is a significant line item; a freight elevator is a much larger one.
  • Occupancy classification. Occupied space brings egress, fire, and accessibility obligations that storage does not.
  • Slab condition. If footings need to be cut in, that is concrete work on your critical path.
  • Installation conditions. Working around a live operation, in tight aisles, or off-hours all affect labor.
Engineered Wildeck mezzanine deck built over a live conveyor line in a distribution facility
Engineered per project — column grid, load, and access are all decisions, not defaults.

Shop Online at MaterialHandling-USA.com

Handrail, mesh infill, folding ladders, and rolling ladders are available to order online. Mezzanine structures are engineered and quoted per project.

Frequently Asked Questions

Do I need a building permit for a mezzanine?
In essentially every jurisdiction, yes. A mezzanine is a structure, and building departments require stamped drawings sealed by an engineer licensed in your state. We supply the engineering package for submittal. Permit review time is usually the longest lead item after steel fabrication, so start it early.
How much clear height do I need?
As a working guide, about 14 feet of clear height supports a usable single-level mezzanine with adequate headroom above and below. Less than that and headroom underneath becomes the constraint. Two- and three-tier systems need proportionally more. We measure on site because obstructions — sprinkler mains, ductwork, lighting, roof structure — usually matter more than the peak height number.
Will a mezzanine damage my slab or require footings?
It depends on your slab thickness, subgrade, and the column loads. Mezzanines concentrate load into base plates, so a thin or older slab sometimes needs footings cut in and poured. We evaluate this during the feasibility visit rather than discovering it during installation.
Do I need sprinklers under the mezzanine?
Frequently, if you use solid decking over a sprinklered area — and it is often the largest surprise cost on a project. Bar grating lets sprinkler water pass through and commonly avoids the requirement. Confirm with your local fire marshal before selecting decking, not after.
Can I put offices on a mezzanine?
Yes, and it is one of the most valuable uses — supervisory space overlooking the floor without consuming any production area. Occupied space brings additional obligations for egress, fire protection, and potentially accessibility, so the occupancy classification needs to be decided at concept stage rather than after the deck is built.
Can a forklift drive on the deck?
Only if it is engineered for it. Forklift-rated decks require heavier framing and typically a concrete-filled deck, and they are designed that way from the outset — it is not an upgrade you add later. If there is any chance a lift truck will go up, tell us at the layout stage.
How do we get pallets up there?
A vertical reciprocating conveyor is the usual answer: much less expensive than a freight elevator and not subject to elevator code, because it moves material only and people never ride it. Pallet drop gates loaded directly by a lift truck from the deck edge are the other common approach.
Can a mezzanine be moved or expanded later?
Free-standing structural mezzanines can be disassembled, relocated, and often expanded, which is a real advantage over construction — the asset goes with you if you relocate. Rack-supported systems are much less flexible, since moving the rack means re-engineering the deck. If relocation is plausible, say so up front and we will design for it.
How long does the whole project take?
Feasibility and layout take days. Engineering and permitting take weeks and vary by jurisdiction. Fabrication depends on scope and current steel conditions. Installation is usually days to a few weeks and can be phased around your operation. We give you a realistic schedule with the quote rather than a best case.

Find Out What Your Clear Height Is Worth

We will visit your facility, measure clear height and obstructions, check your slab, and return a layout with load ratings and a realistic budget. Free feasibility consultation — call (800) 326-4403.

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