Prefabricated wall panels arrive on site as complete wall sections: studs, plates, sheathing, and often insulation, windows, and doors already installed. The crew’s job is to lift each panel into place, set it to line and level, brace it, and connect it to the structure. The field process follows the same logic used in tilt-up concrete construction, where panel fabrication and erection methods are planned around crane reach, panel weight, and lift sequence. A well-organized crew can set an entire floor of panels in one day, where stick framing the same walls might take a week. The payoff depends on preparation: erection drawings, crane selection, rigging, and bracing all get worked out before the first panel leaves the trailer.
Planning the Delivery and Laydown Sequence
Erection starts before the crane arrives. Panels travel on flatbed trailers or A-frame racks, and each one is numbered to match the erection drawings. The sequence in which panels are unloaded and laid down controls how fast the crane can work once lifting begins. Panel design also shapes the sequence: the location of field joints between panels determines which panels must be set first and how the crew will seal the finished wall. The delivery crew checks each panel for shipping damage, including warped studs, torn sheathing, and damaged lift hardware, before it is unloaded.
Reading the erection drawings
The erection drawings list every panel by number, with its dimensions, weight, lift points, and connection details. The foreman walks the crew through the drawing before the first lift so each worker knows which panel comes next. Panel numbers are printed on the bottom plate or on a tag stapled to the face, and the crane operator gets a copy of the sequence.
Laydown orientation
Panels should be staged so the crane can pick them in order without rehandling. Store them flat on dunnage or in A-frames, with the interior face up where the drawing requires it, and keep the stack dry and clear of the crane’s swing path. A 12 ft by 9 ft sheathed panel weighs roughly 600 to 800 lb, and in a 25 mph wind that same panel develops enough sail force to be dangerous, so laydown areas stay sheltered from gusts and panels get tied down overnight.
| Panel type | Typical width | Typical height | Approximate weight | Crew to set |
|---|---|---|---|---|
| Open stud wall panel | 4 to 12 ft | 8 to 10 ft | 3 to 5 lb per sq ft | 3 to 4 |
| Sheathed wall panel | 4 to 12 ft | 8 to 12 ft | 5 to 8 lb per sq ft | 4 to 5 |
| Pre-insulated wall panel | 4 to 12 ft | 8 to 12 ft | 6 to 9 lb per sq ft | 4 to 5 |
| Prefabricated concrete wall panel | 8 to 24 ft | 8 to 12 ft | 40 to 60 lb per sq ft | 5 to 6 |
Lifting and Rigging the Panels
Crane selection starts with the heaviest panel at the furthest lift point. Every crane has a load chart that relates capacity to radius, and the chart, not the nameplate rating, governs what can be lifted. Add the weight of the rigging and a safety margin of at least 25 percent to the panel weight before comparing against the chart. Rigging keeps the panel flat and true: long panels need a spreader bar so the slings pull straight down instead of crushing the top plate. Panel systems built tight enough to support passive house certification show how much joint quality matters, because airtightness targets below 0.6 air changes per hour leave no room for gaps at panel interfaces.
Crane capacity at radius
A 30 ton truck crane might lift 12,000 lb at a 10 ft radius but only half that at a 30 ft radius, so the pickup point matters as much as the panel weight. Position the crane on the side of the building where most of the heavy panels will be set, and plan the lift path so the boom does not swing over workers or the laydown area. Two tag lines, one at each end, give the setting crew control of a long panel in a breeze.
Rigging hardware inspection
Inspect slings, shackles, and the spreader bar before the first lift each day. Cut, frayed, or heat-damaged slings go out of service, not into the pile to be patched. The rigger attaches the pick points that the factory installed in the panel, usually embedded straps or lifting hardware at engineered locations. Never lift a panel by its studs or sheathing alone.
| Wind speed | Action |
|---|---|
| Up to 20 mph | Normal lifting with full-size panels |
| 20 to 25 mph | Reduce panel size, add tag lines, extra caution |
| 25 to 30 mph | Stop panel lifts above one story |
| Over 30 mph | Stop all lifting, secure loose panels and materials |
Setting, Plumbing, and Temporary Bracing
The accuracy built into factory-built wall assemblies only pays off when the crew sets panels to tolerance. Each panel goes onto a continuous bead of sealant or a foam gasket on the sill, is pushed to the layout line, and is checked for plumb before the crane releases. Temporary braces go on immediately, one for every 8 to 10 ft of wall, angled at about 45 degrees and anchored to the floor slab or to temporary stakes.
Plumb and alignment checks
A 4 ft level or a laser verifies plumb, and a string line checks the top plate for straightness. Typical field tolerances are 1/4 in. of plumb over 10 ft of height and 1/8 in. of alignment at the base, though engineered systems may call for tighter numbers. The panel is shimmed at the base only where the drawings allow, because shims transfer load through a small point.
Brace spacing and anchors
Brace spacing follows the wind load calculation on the erection plan. In calm conditions, one 2×4 brace per 10 ft of wall is common; exposed locations may call for braces every 6 ft or heavier anchors. Each brace is nailed to the panel and to a stake, floor anchor, or adjacent structure rated to carry the wind load. Braces stay in place until permanent connections and the roof or ceiling diaphragm make the wall self-supporting, and the crane does not release a panel until at least two braces are installed.
Connections, Sequencing, and Panelization
The move toward panelization in modern construction works only when connection details are executed in the field exactly as drawn. Anchor bolts or hold-downs tie the bottom plate to the foundation, panel-to-panel connections join end studs or splice plates, and straps or ties connect the top of the wall to the floor or roof above. Shear walls need hold-downs installed at the specified locations before the panel is braced, because the bracing pattern assumes the anchors are in place.
Anchor bolts and hold-downs
Anchor bolts are typically 1/2 in. to 5/8 in. in diameter, embedded in the foundation and spaced no more than 6 ft apart on center per most designs. Hold-downs for shear walls transfer uplift from the wall to the foundation and are rated for thousands of pounds, so the fasteners and the panel framing around them must match the manufacturer’s installation instructions exactly.
Panel-to-panel connections
The standard connection is nailing through the end stud of one panel into the end stud of the next, with 10d or 16d nails spaced per the plan. Where the design calls for a double stud or a splice plate, the connection is made before the joint is sealed so the fasteners stay accessible. Corner panels get extra nails or metal corner ties per the structural drawings.
- Lay a bead of sealant or set the gasket on the sill plate at the panel location.
- Guide the panel to the layout line with tag lines as the crane lowers it.
- Set the base tight to the line and shim only where the drawings allow.
- Plumb the panel and install the first two temporary braces.
- Run the anchor bolts and make the panel-to-panel connections.
- Verify plumb and line, then release the crane for the next panel.
Quality Control, Safety, and Common Field Mistakes
Residential applications of prefabricated panel systems hold up only when the field details are done right, so durability and design work done in the factory still depends on the crew’s quality control. A short inspection checklist after each panel catches problems while they are cheap to fix: plumb, base alignment, fasteners, sealant continuity, and brace placement. The foreman signs off each panel and photographs the connections for the record.
Safety around the lift
The swing zone is barricaded, and only the rigger and the setting crew work inside it. Workers on the top plate tie off with a personal fall arrest system, and nobody stands under a suspended panel. Hand signals or radios keep the operator and the crew on the same page, and lifting stops when wind, rain, or visibility make the lift unsafe.
Mistakes that show up later
- Lifting a long panel without a spreader bar, which bows the panel and cracks the sheathing.
- Setting panels on a wet or damaged sill, which traps moisture at the base of the wall.
- Releasing the crane before temporary braces are installed.
- Forcing a misaligned panel into place instead of correcting the layout.
- Over-driving nails in the sheathing, which tears the panel face.
- Skipping joint sealant, which turns every field joint into a leak path.
Once the last panel is set, braced, and signed off, the wall system behaves as one assembly. For single-family work, prefabricated wood panel construction for high-performance homes follows the same lift, set, and brace discipline at a smaller scale, and the habits that make it work, planning the sequence, checking every connection, and bracing before releasing the load, are the ones that keep a panelized project fast and accurate from the first lift to the last.