Polycarbonate roofing is available in a wide range of colours and is available in single or double-skin/multiwall construction. Fibreglass is considered equivalent to polycarbonate.
Manufacturers can provide the Shading Coefficient (similar to Solar Heat Gain Coefficient but calculated in a different way) for their products.
If you select a more transparent polycarbonate roof with a Shading Coefficient more than 0.4 then BASIX requires you to install shading. BASIX recognises the following types of shading:
- external fixed awning or blind;
- external adjustable awning or blind;
- external fixed louvre; and
- external adjustable louvre.
Note: Only applicable to Alterations and Additions.
Glazed roofs are windows installed in a roof. There are 15 window options available:
|#||Frame and glass||U-value||SHCH|
|1||standard aluminium, single clear||7.63||0.75|
|2||improved aluminium, single clear||6.44||0.75|
|3||standard aluminium, single toned||7.57||7.57|
|4||improved aluminium, single toned||6.39||0.56|
|5||standard aluminium, single pyrolytic low-e||5.70||0.47|
|6||improved aluminium, single pyrolytic low-e||4.48||0.46|
|7||standard aluminium, double clear||5.34||0.67|
|8||improved aluminium, double clear||4.12||0.66|
|9||standard aluminium, toned/air gap/clear||5.31||0.48|
|10||improved aluminium, toned/air gap/clear||4.09||0.47|
|11||timber or uPVC, single clear||5.71||0.66|
|12||timber or uPVC, single toned||5.67||0.49|
|13||timber or uPVC, single pyrolytic low-e||3.99||0.40|
|14||timber or uPVC, clear/air gap/clear||3.67||0.59|
|15||timber or uPVC, toned/air gap/clear||3.64||0.42|