Simple or sandwich roof constructions may be used. The simple free-standing roof is composed of a single curved sheet which covers the distance between the supports. This type of solution is recommended for open coverings which do not require insulation.

The free-standing sandwich roof consists of a free-standing corrugated sheet, a series of omega-shaped profiles, insulating material (rock wool or fibreglass) and an upper corrugated sheet which may or may not be free-standing.