Translucent roofing profiles deflect to a greater degree than metal roof or wall claddings of the same dimension. For this reason it is recommended that the roof pitch be increased for translucent roof lighting profiles on weathertight structures. Where Topglass GC Translucent Roofing is designed to be installed in conjunction with long lengths of metal roofing at very low roof pitches (5° or less), there will always be a risk of water ingress. In this instance Alsynite recommends that roofing profiles with a rib height of at least 32mm should be utilised, reducing the possibility of water ingress.

Better practice is that all translucent roof lighting profiles with sheet lengths >15m in length should be high rib profiles >32mm, or that the roof pitch should be increased by 3°.

Low pitch roofs can in some instances expose the roof area to increased weathering over a long term period. Alsynite developed its Topglass GC (Gel-Coat) Exo-Set 206 to combat this issue with the introduction of its new generation UV enhanced premium Gelcoat.

Topglass GC with Exo-Set 206 technology has been the product of choice on high end commercial projects such as Sistema Plastics' new building, NZ Cycling's Avantidrome in Cambridge, Fonterra's new builds, Porter's Group and many more with varying degrees of roof pitches.