When it comes to installing PVC roof panels, there are a few very important steps to take into consideration. To begin with, the panels need to be cut to the desired length. On average, most panels come up to thirty two feet in length. Next, there will need to be pre-drilled holes on the ridges of the PVC. If the PVC does not already have those holes, then the holes will need to be drilled. After that, the panels will need to be property installed by placing them directly onto purlins attached to roof trusses.