Mezzanines, Catwalks and Platforms in Wyoming

Walk a Wyoming plant at shift change and count the stairs. Operators climb to valves, sample points, gauges and motor control rooms all day, and every one of those climbs stands on steel that somebody had to hang. We build mezzanines, catwalks and work platforms inside existing process buildings, warehouses and shops, and we build them so the plant can keep running underneath.

The job looks simple on a drawing. It rarely is. Columns sit where the field says, not always where the old set says. The slab under a new mezzanine was poured for one load and may now carry another. Piping, conduit and cable tray run exactly where a new beam wants to go. We measure the real building first, then fabricate. That is how a catwalk across a pipe rack lands on the first lift instead of the third.

Industrial buyers in this state tend to need the work in two situations. One is a planned outage, where the platform has to be in and signed off before the unit restarts. The other is a quiet growth project, where a warehouse or maintenance shop needs storage or office space overhead without a new footprint. We plan both around access, around the drive to site and around the weather, and then around the work itself.

What We Put in the Air

Our scope runs from a single stair tower to a multi-level structure. We erect freestanding mezzanines with steel columns, beams, joists and decking. We build catwalks and crossovers between buildings, between tanks and across pipe racks. We build maintenance platforms around equipment, ladders with cages or fall arrest, stair towers, handrail and toe board, grating and checker plate, and gates at fall hazards.

We also handle what goes with the steel. That means the footings or base plates under new columns, slab coring and patching, small electrical and lighting for the new level, sprinkler heads where the new floor changes coverage, and the door and egress work the code requires once people work above grade. A mezzanine is a building inside a building, and the inspector will treat it that way. In a manufacturing plant that usually means the owner's own engineering group reviews it first.

Survey, Detail, Fit, Then Hang

We start with a field survey. Dimensions get taken from the real columns and the real slab, not from the last revision of a drawing that nobody updated after the third retrofit. Where clearances are tight we scan or mock up the path of each beam before shop drawings are issued. Shop drawings go to the owner's engineer, and nothing gets cut until they come back approved.

Fabrication happens off site wherever it can. Field welding in an operating plant means hot work permits, fire watches and shutdowns of nearby systems, so we bolt where the design allows it and weld where it does not. We stage steel in a laydown area outside the process, bring it in on the shift the plant can accept it, and set it with the smallest crane or lift that will reach. Every pick gets planned against overhead lines, piping and people.

Working Above Operating Equipment

Plants like the refinery just east of Sinclair, a town that began as the planned Parco company town in 1924 and 1925 around that refinery, and the Casper-area refinery in Evansville, are the kind of heavy industrial sites where this work gets done. The people building a platform there are working near energy, hot surfaces, chemicals and moving machinery that belong to someone else. We attend the site safety orientation before the first person climbs. We follow the owner's lockout and hot work rules without negotiating them, and we hold a pre-task meeting every morning that names what is above, below and beside the crew.

Fall protection is the main hazard on this kind of job, and the platform itself is the cure once it is finished. Until then we tie off, use temporary rail where it fits, and keep tools and bolts from dropping onto people below. Drop zones are barricaded. Nothing about the building sequence is allowed to put a worker where a dropped plate could land on him.

Codes, Permits and Where the Rules Change

Wyoming has no single statewide commercial building code that every jurisdiction must follow. The Department of Fire Prevention and Electrical Safety adopted the 2024 International Codes on June 28, 2024, including the International Existing Building Code that governs alterations inside existing structures. Cities and counties with delegated authority adopt and enforce their own editions and amendments, so the edition that applies to your mezzanine depends on where the building stands.

That matters for occupancy and egress. A new level can change the occupancy load, the travel distance to an exit and the fire protection the building needs. We confirm the local edition and amendments with the building department before drawings are final, and we bring the structural engineer and the sprinkler designer into the same conversation early. Some owners also carry their own insurance and corporate standards that run stricter than local code, and we build to the stricter set.

What Moves the Price

Most of the cost swing in platform work comes from access and from conditions we cannot see until we open things up. A mezzanine in an empty warehouse with a clear slab is a different job from a catwalk threaded through an operating pipe rack. Crane reach, shutdown windows, the amount of hot work, and whether we must work overnight all show up in the number.

Steel price and fabrication lead time matter too. We ask for the structural package early, and we order long-lead steel and grating as soon as the owner approves shop drawings. If the work is tied to a planned turnaround, we price it against the outage date, because missing that date costs the owner far more than the steel did. Tell us the date and we will work back from it. The same logic applies to tenant improvement packages that bundle a platform with other interior work.

Tell us the date the platform has to be ready

Send us the building, the load and the date you need it done. We will walk the site, survey the conditions and give you a plan that names the shutdown windows. Start with structural steel erection if the steel package is the open question, or call about the platform itself.

Common Questions

Can you build a mezzanine without shutting down the operation below it?

Usually yes. We sequence column footings, steel erection and decking so the floor below stays in use, and we close off only the lanes under active picks. Overhead work is done on shifts the plant chooses, and pedestrian and forklift traffic is rerouted with barricades. The exceptions are tight spots over live process equipment, where the owner's lockout rules may require a short shutdown of one unit.

Do we need a permit for a freestanding mezzanine in an existing building?

In most Wyoming jurisdictions, yes. A new floor level changes structural loading, egress and often fire protection, and the local building department decides what it needs to see. Because the state does not impose one code on every locality, we call the building official before drawings are finished and ask which code edition and amendments apply. That call saves a resubmittal.

How do you handle a catwalk that has to cross an operating pipe rack?

We measure the rack in the field, plot every pipe, support and conduit, and design the span to clear them. Pieces are fabricated in sections small enough to set by crane or lift on a shift when the owner allows it. Bolted connections are favored over field welds near live lines, and every pick is planned in advance with the unit operators.

What load does a mezzanine floor have to carry?

The design load comes from the use. Light storage, shop equipment, office space and heavy parts storage all call for different live loads, and the structural engineer sets that number. We ask early what will sit on the floor, including forklifts, racks and rolling stock, because changing the load after steel is ordered is expensive.

How long does a typical platform or mezzanine take?

A small platform can be fabricated in a few weeks and set in days. A larger mezzanine with stairs, sprinklers and electrical takes longer, mostly because of shop drawing review, steel lead time and inspections. Weather rarely stops interior steel, but it can slow crane work and delivery on exposed sites, and long hauls to remote plants add time to every load.