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.
Glazed roofs
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 |
Last updated: 21/09/2023