COP:fitness-purpose; transport-handling-and-storage-rooflights

11.5 Transport, Handling And Storage of rooflights 

All roof lights should be handled and stacked with care as film surfaces are easily scratched, and heavy stacks can damage lower sheets.
All roof lights should be stored flat, the right way up, on 75 mm battens not more than 1.2 m apart. Stacks should not be higher than 1 m and should be covered and protected from rain and sun. Thermoplastic sheets can overheat and deform in a stack, and exposed stacks can permanently discolour due to the effect of sun and water.

11.5.1 Maintenance 

First maintenance after 12 months requires cleaning any grime or debris using warm water and a stiff bristled brush. Every 2 - 3 years rooflights should be inspected for damage, the condition of the flashings, and sealants and the fixings should be checked for tightness.
Roof lights must not be painted over as this renders them hazardous to maintenance workers.

Because painted roof lights appear no different in place than metal sheets, this practice can be dangerous for any workers carrying out maintenance work on the roof. Painting can also cause heat distortion which can lead to premature failure.

As a warning, primary and secondary fasteners can be brightly coloured, providing a contrast with the remainder of the roof cladding surrounding the roof light areas. The area can also be marked around with a distinctly painted stripe.

Lichen will accumulate on plastic roof lighting wherever there is a source of nutrients, but it should be removed with care. See 15.7.1 Lichen And Mould.