Skoolies, Converted School Buses Repair

A school bus body is riveted steel sheet over formed steel ribs, sitting on a separate ladder frame, and it is far tougher than any RV structure of comparable size. That toughness is why skoolies exist. It also means the conversion work done to it is what usually needs repair, not the bus. Two modifications account for most of what we see. The first is a roof raise, where the body is cut horizontally, lifted, and a band of new material spliced in. Done properly the splice is welded with continuous reinforcement inside every rib and the seam is designed to shed water. Done quickly it is a lap joint held with self-tappers and a bead of sealant, and it will leak along its entire length within two seasons and eventually crack at the rib splices.

The second is window deletes. Original bus windows are structural in the sense that their frames tie the rib sections together, so plating over an opening with sheet metal without restoring the frame stiffness leaves a soft section in the body side. On a bus that is regularly loaded with several thousand pounds of tanks, batteries, and cabinetry, those soft sections show up as body side oil canning and as cracks radiating from the plated corners. We reframe them properly, which means welding in structure rather than skinning over the hole.

Underneath, the original floor is the sleeper problem. School bus floors are plywood over steel, and after twenty years of institutional service that plywood has been wet many times from window leaks and heater cores. Owners frequently build a new floor directly on top of it. Then the steel under the plywood keeps corroding, and in coastal or inland valley humidity it perforates. Every skoolie we take in for anything gets the original floor evaluated, because a beautiful interior over a rotten deck is the most common expensive mistake in this segment.