Pre-Engineered Metal Building Foundations in Casper, Wyoming

A metal building arrives as a kit, and the kit does not forgive a foundation that is off. Column base plates sit on anchor bolts set in the footing, and if the bolts are a half inch out of position the erector either forces the steel or the concrete crew comes back with a core drill. In Natrona County, where metal buildings serve shops, yards, hangars and field offices, our job is to deliver a slab and a footing set that the erector can bolt to on the first day.

The metro has plenty of reasons to choose steel. Oilfield service yards at Midwest and Edgerton need weatherproof shops quickly. Airport tenants build hangar and maintenance space. Small manufacturing plants and contractors want clear-span space they can finish on their own schedule. The cost of a metal shell is low enough that foundations and site work often represent the largest share of the project.

This is how we approach the concrete and the dirt for a pre-engineered metal building, from column reactions to snow, frost and field layout.

Why steel buildings work in the oilfield and airport markets

The Salt Creek Oil Field in Natrona County produced more oil than any other Rocky Mountain field by 1970, with the Dutch No. 1 gusher drilled in 1908, and it now uses CO2 enhanced oil recovery. The towns of Edgerton and Midwest sit on the edge of that field and were created to serve the oil businesses, with the state highway running east through both. Oil, gas and midstream service operations there need shops, parts storage and wash bays, and a metal building is the typical answer.

On the airport grounds, the state forestry helibase serves as the centralized wildland fire operations center with fueling, parking, maintenance and crew housing. A hangar for an airport tenant is a close cousin, and we cover it under aircraft hangars. The helibase and the hangar are the type of work that fits steel construction: service bays, equipment storage and operational space that needs to go up fast. The Salt Creek oil field area and the airport are two of the places where we expect metal-building foundations to be in demand.

Reactions, bolts and a foundation the erector can use

The manufacturer's anchor bolt plan and reaction schedule are the starting point. They give us column locations, bolt sizes, loads and tolerances. We lay out from survey control, build footing forms or drill piers, set the bolts using a template that holds them plumb and at the right projection, and check them again after the pour. Column lines that are even a little off cause erection problems that nobody wants to fix on a crane day.

Footing type depends on the soil and the load. Spread footings and a stem wall work for many sites. Footings and stem walls are the common choice for a building with a modest height and good soil. On weak or variable soil, or on heavy crane-bay buildings, the engineer may call for drilled pier foundations bearing on firmer material below.

Snow, wind and who decides the design values

The metal building manufacturer designs the frame to loads the owner or engineer supplies. Wyoming does not have a single statewide building code: cities and counties adopt and enforce their own. The City of Casper lists a three foot frost line, severe weathering and seismic design category B, and refers snow load to the 2024 IBC and the ASCE Hazard Tool instead of a fixed number. Outside the city, we ask the county or town for its design values before the frame is ordered.

The frame supplier needs those numbers early, because a change in snow load changes the frame and the reactions we build to. Commercial permits in the city often need engineered building and site drawings, and plan review looks at structural calculations. A metal building package should include foundation drawings stamped by an engineer licensed for the project.

Slab, floor drains and the yard around it

The floor in a metal shop sees tire loads, jack stands and the occasional dropped tool. We pour a reinforced slab with the thickness and joints the engineer specifies, saw-cut it on time and cure it properly. Floor drains, oil separators and trench drains must be set before the slab pour, and we coordinate with the plumber to keep slopes correct.

The ground outside matters as much. A yard of compacted base and gravel handles trucks and equipment; concrete aprons at the overhead doors carry the point loads from vehicles turning in. We shape the site so surface water runs away from the building and not toward the door. Our hot and windy weather concrete practices come into play in summer wind, and frost protection comes into play from October on.

From Casper out to the oil fields

We work in town, but a lot of metal-building work is remote. Midwest is about 40 miles north of Casper and Edgerton about 45, reached via the state highway that begins at an Interstate interchange. At that distance, haul time governs the concrete: we use retarded or controlled mixes, send fewer trucks at a time and plan the pour for a day when the batch plant and the roads are clear.

Remote sites also have their own weather. The climate record at Midwest shows a high of 106 degrees and a low of minus 42, so the same building can need summer evaporation control and winter protection in one year. We plan for both from the first estimate.

Matching the foundation to the kit

A pre-engineered building has a manufacturing lead time that can run weeks or months. The foundation does not have to wait for the steel to arrive, but the anchor bolt plan must be final. Building slabs and footings in autumn lets the owner take delivery in spring, but only if the bolt plan is approved and protected from frost. We cover exposed bolt threads and keep footing tops free of ice.

On tight schedules, we pour footings first, set the bolts, and place the slab after the shell is closed in, so the floor cures in a heated space. That order costs a few extra days of crane time, but it keeps winter off the slab and gives the erector clean footings to work on.

Send the bolt plan and the site

Send the anchor bolt plan, the parcel and your target date for steel delivery. We will give you a footing and slab plan, a weather plan and a price for concrete and dirt work.

Questions Owners Ask

Who sets the anchor bolt layout, you or the building supplier?

The building supplier issues the anchor bolt plan and reactions. We build to those drawings and the engineer of record's foundation design. If anything does not match, we flag it before concrete goes in, not after.

Can I put a metal building on a slab only, without footings?

Sometimes, if the engineer designs a thickened-edge slab that carries the loads and the frost depth is addressed. In Casper, with a three foot frost line, the engineer will usually want footings or a deeper edge. We build whatever the stamped drawings call for.

How much does a remote oilfield site add to cost?

Mobilization, trucking time and weather risk. A long haul from the plant means a retarded mix and a tight pour plan. We list those items so the owner can see them. If the same crew can pour several pads on one trip, we price them together.

Is a gravel floor acceptable inside a metal building?

It can be for storage or equipment sheds, if the owner accepts dust and wear. For any shop with vehicles or process work we recommend a slab. We compact the base either way, because soft spots under gravel become ruts.

How soon after the pour can the steel go up?

The footing must reach the strength the engineer requires before the erector loads the columns. We break cylinders and tell the owner and the erector the date. Cold weather can delay that, so we plan cover and heat in the schedule.

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