Mezzanines, Catwalks and Equipment Platforms for Denver Industrial Buildings

Clear height you already pay for sits unused above most plant floors, and a mezzanine is the cheapest square footage an industrial owner can add. We build freestanding steel mezzanines, equipment platforms, maintenance catwalks and crossover walkways for plants, cold-chain buildings and fulfillment centers across the Denver metro, without moving a wall or touching the roof.

The work looks simple on a drawing and is not. A mezzanine is a building inside a building: it carries its own live loads, needs stairs, guardrails and egress that satisfy the local building department, and lands on an existing slab that was poured for forklift traffic, not for concentrated column loads. Catwalks and process platforms add the other half of the problem, which is reaching valves, tanks, air handlers and conveyors without shutting a line down.

Most of our mezzanine work is for operators who cannot stop production. That is why so much of what follows is about load paths, sequencing and inspection rather than steel tonnage.

What We Build Above the Floor

The package starts with freestanding mezzanines for pick modules, parts storage, packing lines and office space, framed in structural steel with bar joist or beam-and-deck floors. We also build equipment platforms around tanks, fermenters, compressors and rooftop-style air handlers set inside the building, plus catwalks that carry operators and maintenance crews across conveyor lines and over aisle traffic.

Each structure comes with its stairs, ship ladders, landings, handrails, mid-rails, toe plates and swing gates for pallet drops. Floors can be open grating where sprinkler water and light need to pass, checker plate for wet process areas, or concrete over metal deck where a quiet, stiff floor matters. Column and beam erection follows the same discipline as our structural steel erection work, scaled to fit inside an occupied building.

Slab, Columns and Egress Before Any Steel Arrives

Every mezzanine begins with the slab. We review the existing slab thickness, reinforcement and subgrade, locate embedded conduit with scanning, and compare column reactions against what the floor can carry. Where it cannot, we cast thickened footings under each column base rather than hope. The same thinking applies when the platform will hold heavy equipment, and the pad design overlaps with our equipment pads and foundations work.

Life safety drives the layout as much as structure does. Sprinkler coverage has to reach above and below the new floor, exits have to stay within allowable travel distance, and the stair landing cannot swing into a forklift lane. We walk the layout with the plan reviewer early, because the cheapest redesign is the one that happens before fabrication starts.

Why Metro Operators Keep Building Up

Metro land is expensive and rail-served parcels are scarce, so owners stack function vertically. In Thornton, a fulfillment center announced in June 2017 was described as an 855,000 square foot, three-level building with 2.4 million square feet of floor area, which shows how far a footprint can be multiplied once you commit to elevated floors and conveyors between levels. Operators in the Thornton industrial corridor know that math well.

Process plants work the same way. Molson Coors broke ground in October 2020 on an overhaul of its Golden brewery that added fermenting, aging and filtration capacity, and every added vessel brings walkways, ladders and access platforms with it. Breweries, bottlers and other food and beverage producers are constant users of this kind of steel.

Working Over and Around Live Production

Erecting steel above an active floor demands a plan for what falls and who is underneath. We barricade and net the work zone, schedule overhead lifts for off-shifts or weekends, and lay out forklift detours before the first beam is set. Hot work and welding follow permit procedures coordinated with the plant safety lead, with fire watch and spark containment around product and packaging.

Plant lockout and tagout rules apply to us as visitors, so we sit down with maintenance before the schedule is set. Fastening into the slab uses anchor bolts or epoxy-set rods selected after the concrete is scanned and tested for strength, and we leave temporary guardrails on every open edge until the permanent system is inspected. Handing the owner a floor that is safe on day one matters more to us than any shortcut, and our superintendent walks each completed section with your safety lead before it opens.

Where Mezzanines Fit With the Rest of the Job

A new mezzanine rarely arrives alone. It often houses a control room or supervisor offices, which ties into our industrial office buildouts, and it may require electrical, lighting and fire protection changes below. Ground-floor changes can include new dock positions, and where the building height allows it, crane rails or taller racking, as covered in our high-bay crane-ready building work.

Warehouse operators adding pick modules inside a distribution center usually phase the mezzanine with racking and conveyor installation, so we coordinate steel completion dates with the equipment vendors who follow us up the stairs.

Add Floor Space Without Moving the Walls

Send us the building plan, the slab details if you have them, and the load you need to carry. We will walk the space, tell you what the floor can support, and price the steel, egress and inspections as one package.

Common Questions

Does a mezzanine in a Denver-area building need a separate permit?

Yes in nearly every metro jurisdiction. A mezzanine adds floor area and occupant load, so it goes through plan review for structure, egress and fire protection. Adopted code editions differ by city and county, which is why we confirm the edition and any local amendments with the building department before drawings are finalized. We typically submit stamped structural drawings with the fire protection changes.

Can our existing slab carry mezzanine columns?

Often, but not always. Slabs designed for forklift and pallet loads can fail under concentrated column reactions if they are thin or sit on soft subgrade. We check thickness and reinforcement, test the concrete where needed, and add thickened footings under each column base when the numbers do not work. That cost is much lower than correcting a cracked slab after racking is loaded.

How long does a typical mezzanine install take on an operating floor?

A single-bay platform can go up in days once steel is fabricated, and a large multi-bay structure usually runs several weeks of field work. The long pole is nearly always fabrication and permit review, not erection. We schedule noisy and overhead work for off-shifts, and we keep forklift aisles open during the rest of the week.

What decking should we choose for a wet or washdown area?

Open steel grating or galvanized checker plate holds up better than painted deck in washdown rooms, and it lets sprinkler water pass. Concrete over metal deck is quieter and stiffer but needs sealing and drainage planning. We match the deck to your cleaning chemicals, sanitation schedule and sprinkler design.

Can the mezzanine be moved later if our layout changes?

Bolted steel mezzanines can be disassembled and re-erected, which is why we favor bolted connections where the structural design allows. Field welding gives a stiffer frame but makes future changes harder. Tell us up front if you expect to reconfigure, and we will frame it so the move is practical.

Related