I've installed FreeBSD here, I have come from Linux so I am still adaptating.

A linear, indurated depression running vertically just to one side of the midline is characteristic of en coup de sabre, a variant of morphea.

This is a valuable artefact and should be treated as such.

J22: Proprietary roof decking with asphalt finish deals with prefabricated roof decking (steel, aluminium, timber, woodwool, etc), together with vapour barriers, insulation and asphalt covering and finishes intalled as a complete roof by a specialist firm.