Best practices for jobsite handling of sandwich panels: sloped pallet storage against water pooling, protective film removal schedules, crane lifting with nylon web slings, and vacuum lifting robots.
Factory-certified sandwich panels frequently suffer preventable damage during jobsite staging prior to erection. Stacking flat on wet ground induces capillary white rust, unpeeled protective film bakes onto pre-painted coatings under UV radiation, and narrow wire chokers crimp tongue-and-groove joint profiles during crane offloading. This guide outlines standard protocols for jobsite storage, sloped timber dunnage, protective film peeling schedules, and crane rigging.
1. Sloped Stacking to Prevent White Rust
Bundles must never rest flat on damp ground. Capillary action draws rainwater between tightly compressed panels. Under sunlight, greenhouse heating produces white rust that destroys the zinc substrate. Bundles must be stacked on timber bearers at 1.5m intervals with a 5% longitudinal slope, leaving end tarpaulins open for ventilation.
2. Peeling Protective PE Film
Protective film is designed strictly for transit protection. Solar UV rays cross-link adhesives, baking the film irreversibly onto coil coatings. Film must be peeled within 15 days of erection and never left exposed to direct sunlight for over 30 days.
Comprehensive Engineering Comparison Matrix
| Jobsite Operation | Common Field Mistake | Engineered Standard |
|---|---|---|
| Ground Stacking | Flat on ground, sealed tight in plastic | 5% sloped dunnage with ventilated canvas |
| Protective Film | Left on for months until handover | Peeled immediately within 15 days of fixing |
| Crane Rigging | Bare steel wire ropes | Wide synthetic web slings with edge protectors |
| Panel Depalletizing | Dragging panels horizontally over each other | Lifting vertically clear of adjacent panels |
Verdict: Enforce sloped ventilated dunnage on jobsites, peel protective films promptly within two weeks of fixing, and employ vacuum lifting robots or spreader beam slings for damage-free installation.
Calculate Live with Your Project Dimensions
Apply the engineering criteria from this guide to your specific building; estimate take-offs, load capacities, and logistics instantly.
Roof & Wall Sandwich Panel Quantity & Logistics Calculator
Define your building dimensions and scope (Roof, Wall or Complete Envelope) to estimate net surface area, tonnage, logistics and budget.
Frequently Asked Questions
What is the crane lifting advantage of vacuum lifting robots? ▼
Vacuum lifters grip panels via suction cups across the top skin, eliminating edge crimping and enabling single-operator placement of continuous lengths up to 18 meters.