On a tilt-wall building the slab is poured twice in effect: first as the floor, then as the bed on which the walls are cast. That one decision shapes the whole schedule. If the slab is not flat, clean and cured to strength, the panels come out marked and warped, and the crane has no stable surface to work from. The people who plan a tilt-up job well begin with the floor and the crane path, not with the panels.
Tilt-up is the common structure for larger industrial buildings in this market. The Centerra Industrial buildings in Loveland are listed as concrete construction with 24 ft clear heights, dock-high loading and ESFR sprinklers, and the largest of them was announced as a roughly 123,000 sq ft Class A building with construction starting in April 2018 and completion projected for January 2019. A nine-month window from groundbreaking to completion on a building that size leaves little room for a late pad, a bad pour or a lost crane day.
We build the pad, the footings, the casting slab and the site concrete around the panels, and we plan the pours with the panel erector so the two crews are never waiting on each other. The sections below explain what that coordination looks like in practice for owners and the general contractors and CM firms who hire us.
The sequence starts with the footings, which carry the panels and the interior columns. Perimeter footings are placed with dowels or pockets to receive the panel bottoms, and the interior footings are set to the column grid. The slab follows, placed with its construction joints aligned to the panel layout so that no joint falls under a panel bearing.
A bond breaker goes on the slab before the panel forms are set, and the forms are laid out on the floor with embedded plates, lifting inserts and reinforcing cages. This is where our tilt-up concrete panel work is most visible: the quality of the form edges, the accuracy of the inserts and the finish of the panel face all depend on the quality of the floor under them.
We lay out the panels on paper before the slab is poured. The engineer's elevation drawings tell us how many panels there are, what they weigh, where the openings sit and how many we need to stack. From that we decide where the slab needs extra thickness or steel, where it can be left lightly reinforced, and where we should place the block-outs for plumbing that cannot go through the bed. The floor is cured but not sealed, because curing compounds can interfere with bond breakers.
The slab has to be flat enough to cast against. Our super-flat floor slab practices carry over: laser screed or a vibrating screed, careful edge control, and a finisher who knows that panel faces will show every ridge. When the casting bed is also the final floor, we protect it from chair marks and form stains.
Panel erection is the most dangerous hour of the project. A heavy crane moves along the building perimeter on prepared ground, panels are rotated from horizontal to vertical, and temporary braces hold them until the roof structure ties them together. We prepare and compact the crane path to the load the crane contractor specifies, and we place the brace footings or slab inserts according to the engineer's bracing plan.
Wind is the main weather constraint. The Fort Collins criteria refer wind design to the Front Range Gust Map, and the erector sets a wind limit for lifting. We watch the forecast for the lift week and keep the pour and the lift on separate days. If the wind exceeds the limit, panels stay down and nobody argues about it.
The pour of the slab comes first, then the panel forms, rebar, inserts and the panel pours. Panels need time to reach lifting strength, often a week or so depending on the mix and temperature, and the lift schedule is built around cylinder breaks. In cold months we use accelerated mixes and curing blankets, and in hot weather we use retarders and evaporation control.
A typical sequence is slab, panel layout and casting, lift, then roof steel. Interior slabs and aprons may follow the lift, which allows heavy equipment to run on subgrade for the footings but keeps it off the finished floor. Our work on concrete formwork for pilasters, pour strips and loading dock walls is staged to fit around the crane.
Fort Collins lists a minimum ground snow load of 50 psf (ultimate) for Risk Category 1 and 2 buildings, a roof snow load of at least 43 psf and Seismic Design Category B. Tilt panels act as shear walls in the lateral system, so panel connections, footing dowels and diaphragm ties are designed with those loads. Our job is to place the embeds and dowels exactly where the structural drawings call for them.
Unincorporated Weld County adopted the 2024 International Building Code effective June 15, 2026, with engineered foundation designs required for most new structures. In Fort Collins the 2024 International Building Code with local amendments is current for permits submitted on or after April 1, 2026. We submit shop drawings and inspection requests in the jurisdiction's format and keep the inspector's cards on site.
Large tilt buildings are common as manufacturing plants and, with insulated panels and sealed floors, as cold storage facilities. The exterior concrete (truck courts, dock aprons, paving and curbing) is usually under the same contract. We also run the underground utilities that feed these buildings before the pad is released. Plants that assemble vehicles are described on our automotive and EV plant page.
On projects in Loveland and along the I-25 corridor, we plan haul routes and construction access with the jurisdiction ahead of time, including the road weight limits that apply to concrete trucks and cranes. Accurate quantities let the batch plant reserve enough trucks for each pour.
Tell us the panel count, the building footprint and the target lift date. We will return a pad, footing, slab and site concrete plan that fits the panel erector's calendar.
From pad release to roof dry-in, the common range is several months, and the slab and panel pours are the controlling items. A mild stretch lets the panels be cast and lifted in one campaign. Winter protection and wind days extend it, so we give a range and the conditions behind it.
The slab serves as the casting bed for the panels, which is faster and cheaper than building separate forms. It also gives the crane a flat working surface inside the building line. The slab must be flat, clean and strong enough to carry the panels.
It can if it is not protected. We use bond breakers and keep chairs, forms and equipment from marring the surface. After the panels are lifted we clean and, if needed, grind the slab to remove stains or ridges.
A compacted, well-drained path around the building at a width and bearing capacity that the crane company specifies. We build and test that path, and we keep trenches and open utilities out of it during the lift.
The structural drawings define the embed plates and dowels for each panel, and we set them in the forms and footings to tight tolerances. Surveyors check key locations before the pour, and we compare against the erector's shop drawings.