Denver Tilt Up Panel Contractors

Tilt up is the one method where you can watch a building become a building. The walls get cast flat on the finished floor slab, cured until the concrete is strong enough to be picked up by its own inserts, and then stood upright by a crane over a day or two while everyone on site stops what they're doing to watch.

We do this work on commercial and light industrial projects around Denver, including the newer development in and around Central Park and shell buildings serving the Cherry Creek trade. What follows is the actual sequence, in order, because tilt up is a process that rewards planning and punishes improvisation more than almost anything else we build.

The floor is the mold, so the floor comes first

Panels get cast on the building's own slab, which means that slab has to be flatter and cleaner than a floor normally needs to be. Anything in its surface prints straight into the face of the wall you'll be looking at for fifty years. We finish the casting area accordingly, then run bond breaker over it so the panel releases cleanly on lift day instead of taking a layer of your new floor with it.

Bond breaker is where tilt up jobs quietly go wrong. Too little and the panel welds itself to the slab. Too much and you get staining that shows through the finish coat. It goes on at the specified rate, gets a second application where the first one soaked in, and stays protected from traffic and weather until casting starts. Nobody walks a prepared casting bed in dirty boots.

Layout, steel, and everything cast into the panel

Edge forms go down to the panel drawings, chamfer strips at the corners, and every opening gets blocked out: doors, windows, dock openings, louvers. Reveals and rustication strips get set now too, because architectural detail on a tilt up panel is formwork, not something applied later.

Then the embedded items, and this is the part that gets checked twice. Reinforcing to the design, including extra bars around openings and the steel that handles lifting stresses, which are nothing like the stresses the panel sees once it's standing. Lifting and brace inserts placed exactly where the engineered rigging plan says, because those locations are calculated for the bending a panel takes while it hangs. Weld plates for the roof and for panel to panel connections. Conduit and sleeves where the electrician needs them. Every one is easy today and miserable to add later.

Casting day to lift day, step by step

Lift day, and why we watch the forecast more than the calendar

Crane day starts early and moves fast. Rigging goes on, the crane takes the load slowly until the panel breaks free of the slab, then it comes up in one continuous motion while a crew guides the base onto the footing and sets it. Braces go in immediately, anchored into the floor at points that were planned weeks earlier. Panel by panel, the building appears.

Wind runs this day. Denver gets afternoon gusts that can shut a lift down with half the wall standing, and a panel hanging on a crane is a very large sail. So lifts start at dawn and we book weather windows, not dates. Cold works on the front end: panels reach lifting strength on the concrete's schedule, not ours, and a cold week adds days before the crane can even be booked. We build tilt up schedules around strength tests and forecasts.

Before the crane rolls onto the site

• Cylinder breaks confirming panels have reached the strength the lift design requires
• Crane pad and travel route checked for bearing, with buried utilities identified
• Rigging plan, insert locations, and panel weights reconciled against the as built panels
• Brace anchor locations drilled and tested, with the floor clear where braces will land
• Footings and dowels ready, elevations shot, shims and setting materials staged
• Lift sequence walked with the crane operator so no panel gets stranded behind another
• Site cleared of trades who don't need to be inside the swing radius