A steel frame is only as good as the six or eight inches of threaded rod holding it to the ground. When a wind pushes on a metal building, the frame tries to lift off one side and slide on the other, and every bit of that work passes through the anchor bolts and the concrete around them. Get a bolt out of place by an inch and the crew spends a morning fighting it with a torch, which is a bad way to start a job.
We pour the foundations for the buildings we erect, whether it is a farm shop or a commercial metal building, and we supervise the anchor bolt layout. That matters more than it sounds. The frame manufacturer sends a plan of reactions that gives the size, spacing and embedment of every rod at every column. We take that sheet to the field, survey the lines, set the templates and check each bolt before the concrete truck is allowed to back in.
This page walks through how we handle footings, piers, slabs and bolt layout on Oklahoma sites, what drives the cost, and the mistakes we see on buildings that come to us after someone else started them.
Most pre-engineered buildings sit on one of three arrangements. A perimeter grade beam with interior spread footings under the columns suits a simple shop. A monolithic slab with thickened edges works for lighter buildings on good soil. Drilled piers go under the columns where the soil is soft, where a deep frost line is not the problem but poor bearing is, or where the frame reactions are large. Each has a place, and the soils report tells us which one wins.
Our package covers excavation, forming, rebar, embedded items, the pour, finishing and curing. We also handle plumbing and electrical sleeves that have to go in before the slab, vapor barrier where a floor will take coatings, and control joints cut on a pattern that matches the column grid. If you want a sealed or polished floor, tell us early, because the finish changes the mix and the timing.
The state sets minimum codes through the Uniform Building Code Commission, which has adopted the International Building Code with amendments. Many cities list their own editions in their own ordinances, and a city can add amendments. So the first call on any job is to the local building department, not to the supplier. We confirm which edition the reviewer will use and size the foundation.
The foundation drawings come from the building engineer or from a local civil engineer working from the reaction sheet. A permit set usually needs the footing details, the slab thickness and reinforcing, the anchor bolt schedule and a geotechnical report or a stated bearing assumption. Inspectors typically want to see rebar and bolts in place before concrete, and we schedule the pour around that visit rather than hoping the inspector can fit us in.
Oklahoma gives a foundation designer plenty to think about. The National Weather Service Norman office counts 4,518 tornadoes in the state from 1950 to today, with May the peak month, and while no foundation is built for a direct hit by a violent tornado, wind uplift on a lightweight building is real every spring. Moore showed one response in 2014, when its city council passed residential rules calling for hurricane straps and tied-down foundations on new homes built to resist winds up to 135 miles per hour. Commercial buildings follow the engineered path, but the lesson is the same: the connection to the ground is the part you cannot see and cannot cheat.
Ground movement shows up too. For a standard pemb metal building the engineer carries that load path. A published list of Oklahoma earthquakes puts the largest at magnitude 5.8 in 2016 and 5.7 in 2011. Those are rare, but the engineer accounts for seismic design category in the frame and foundation. Soil itself changes from county to county, so we do not guess. A boring log or at least a probe and a bearing figure from an engineer costs little compared with a settled corner.
We build a template from steel or plywood with the bolt pattern cut at each column, tie it to the rebar cage, and shoot the elevations with a level before the pour. Bolts are held so the projection above the finished surface matches the base plate and grout allowance on the drawings. After the placement, we check the pattern with a tape and a second set of eyes, then check it again once the concrete is in and before it sets.
If a bolt ends up off, we do not bend it with a pipe and hope. A misplaced rod gets reviewed by the engineer, and the fix might be a new plate, a drilled and epoxied replacement or a core and re-set. Bent rods lose strength. Our job is to catch the error while the concrete is still fresh, or at least before the steel truck is on the road. We keep a copy of the as-built bolt survey in the job file, which helps later if you add on or sell.
The order on a typical job goes like this: permit, staking, excavation, rebar and bolts, inspection, pour, cure, steel. The frame does not usually ship until the manufacturer approves the anchor bolt plan and releases the drawings, so we aim to have the concrete ready as the steel comes in. Lead time on steel varies with the season and the mill, so we watch it and tie the pour date to it instead of pouring early and letting a slab sit idle.
Concrete needs time. We do not load columns until the slab or piers hit the strength the engineer calls for, and a cold snap or a string of storms can add days. Spring in Oklahoma can mean a wet trench on Monday and a hail warning on Thursday. We build slack into the schedule and tell you where it sits, so the date we give you is one we expect to keep.
Foundation work has its own hazards. Open trenches get sloped, benched or shored as the soil and depth require. Rebar caps cover the ends of vertical bars. Concrete trucks and pump lines get a spotter, and the crew keeps clear of the chute. We also protect the finished edge, since anchor bolts stick up and make a nasty trip hazard if left uncapped.
Once the steel crew arrives, the bolts become a safety item of another kind. Columns stand on them before bracing goes in, so a short or loose bolt is a falling-column problem. That is one more reason we do not skip the second check. See our notes on rigid frame erection for what happens once the frames are on the slab, and our aircraft hangar page for the heavier footings a hangar door wall calls for.
Send us your site address, the building size and any soil report you have, and we will walk through footings, piers or slab options with you. If you are still comparing buildings, our pre-engineered metal buildings page explains what comes in a standard package. Many ag and shop owners start with an agriculture and agribusiness estimate, and we are glad to price the concrete alongside the steel.
The depth comes from the engineer's design, the soil report and the local frost depth. Many shop slabs use a thickened edge, while columns with large reactions get isolated footings or drilled piers. We ask for the soil information at the start so the quote does not change after the first excavator pass.
On our jobs, we are. Split responsibility is where most misplaced bolts come from, because each party assumes the other checked. We lay out, set and verify the bolts, and the erection crew works from our survey.
Yes, if the concrete work follows the manufacturer's anchor bolt plan and the engineer's drawings, and if we can survey the bolts before the steel arrives. We would rather be involved from the start, because corrections after the pour cost more than the layout would have. Ask us for the bolt plan format your concrete crew should follow.
It depends on thickness, reinforcing, soil prep and finish, so a flat number would mislead. The line items that move the price are the subgrade work, the amount of rebar or fiber, the edge thickening and whether you want a sealed or troweled finish. We price those separately so you can see where the dollars go.
The columns bear on the foundation, so the concrete has to reach the strength set by the engineer before we load it. Cold or wet weather lengthens that. We confirm the strength before the frame goes up rather than counting days on a calendar.
Tell us about the site, the building and the schedule, and we will set up a review of scope, schedule and permitting.
See the services, building types and industries we plan and manage across Oklahoma.