- Assembly is largely reduced to an exercise in materials handling and simple labor.
- The erection sequence is often no more than a few hours process involving crane set up, responsible rigging and straight up vertical lifts.
- In-Air assemblies are inherently stable with bracing pre-installed.
- Safety lines and anchorages are in place, ready for subsequent connectors and installers. This eliminates the leading edge hazards of placing these items in air.
Additionally, in the pre-assembly process most time consuming fabrication errors and conflicting site conditions will be discovered while your structure is still on the ground. Diagnosis and correction of these issues, as well as change order and billing is a much simpler matter without the prospect of escalating equipment and erector costs increasing the order of urgency.
Around 1991, when I first started erecting some of the larger spans and more substantial prefab metal buildings in South Florida, I started gravitating towards a greater degree of pre-assembly and multi crane lift sequences. Since then I have found almost no size or scale of metal building erection that cannot benefit from this manner of erection. In my opinion, even the smallest structure is more safely and efficiently erected when a proper pre-assembly and erection plan is executed with as much as 2/3 of the work complete while all components are still on the ground.