Consequently the rooflight must be afforded more than passing consideration. Rooflights often form at least 10% of the total area of many roofs, therefore they must be treated as an essential integral part of the roof.

Daylighting Buildings
Marlon CS Longlife can be used in a wide variety of buildings - industrial, commercial, recreational, agricultural and domestic. Building function determines the required internal lighting level. Roof and rooflight design and construction must optimise light and thermal insulation levels while minimising condensation and solar gain. In practice a suitably lit building interior is often achieved with a total rooflight area equivalent to 10% of the building floor area.



Rooflight areas one sheet wide with a metal sheet spanning one or two purlin centres above and below on the slope are a good layout arrangement in terms of the above functions, giving good light distribution and relative ease in installation while avoiding high wind uplift areas near to roof eaves and ridge.