The length of the area where the skylight is installed is limited by the length the Perspex. If the length is longer than the Perspex, we design 2 or more parallel skylights which can either be dome-shaped or pyramid shaped and call this a Multivault or Multi-barrel Skylight.

There are longer sheets we call Longspan, but discourage their use due to being fragile and difficulty of handling. We however always innovate on standard sheeting pending configurations and dimensions and client taste.