requirements with regards to fenestration are applicable in accordance
with SANS 10400-XA Energy usage in buildings:
1. Buildings with up
to 15 % fenestration area to nett floor area per storey comply
with the minimum energy performance requirements.
2. Buildings with a fenestration area to nett
floor area per storey that exceeds 15 % shall comply with the
requirements for fenestration in accordance with SANS 204.
3. All fenestration air infiltration shall
be in accordance with SANS 613.
SHGC and U Value
SHGC (Solar Heat Gain Coefficient) and U-Value are critical considerations
when specifying windows and glass.