AGG has your 7 Star Glazing needs covered NCC 2022’s adoption date of 1 October is within reach, but award winning designs can still push the boundaries and comply to the increased minimum performance standards, and beyond!
While there are increased minimum performances within the two key glazing factors (U-Value and SHGC), don’t ignore other key performance factors that impact aesthetic and comfort of homes:
U-Value
U-VALUE: Think of this as a measure of Insulation – how much internal heat escapes through the glazing, per m², when it is colder outside than inside, as heat wants to move from where it is hot to where it is not. The lower the U-Value, the better the Insulation.
SHGC:
SHGC
Solar Heat Gain Coefficient. This is a measure of Solar Control – how much heat from the sun enters inside the building through the glazing. The higher the SHGC, the more passive heat from the sun enters inside while the lower the SHGC, the less sun heat enters in.
VLT:
Low (Solar Heat Gain)
Visible Light Transmittance is how much % of sunlight enters inside through the glass. The lower the VLT, the less light enters, and also affects the look and clarity of the glass. For Residential homes we generally want higher VLT to allow high levels of natural light inside.
VLT 79% LSG 1.07
SELECTIVITY: This is a ratio that looks at the relationship of VLT and SHGC as we must be mindful of what impact lower SHGC has on the amount of natural light ingress. A ratio of 1.25 is considered great while a ratio over 2.0 is extremely high performing and even more beneficial. Also known as Light to Solar Gain ratio (LSG).
VLT 79% LSG 1.34
VLT 68% LSG 1.26
SHGC
High (Solar Heat Gain)
Insulglass® U-Value and SHGC positioning chart - including VLT and Selectivity Ratio (LSG):
QUALITY: The processing of glass opens up the potential for quality issues. The Heat Treating of glass for example (Toughening and Heat Strengthening) can see distortion affect the reflection on the glass. Reflections should be as close to a mirror-like reflection as possible.
VLT 71% LSG 2.03
COMPLIANCE:
VLT 66% LSG 2.44 Low (Better Insulation)
U-Value
High
Glass only values, NFRC, 6mm/12mm argon/6mm make ups
Compliance to not only the NCC 2022 demand of Total System U-Value and SHGC, but also processing standards such as AS 2208 for safety glass and AS 4666 for Insulated Glass Units (IGU). All Australian Glass Group plants are certified to these standards.
Proven certified full frame performance data available in WERS Australian Glass Group also understands the vital importance of certification and compliance of glass products. Our products are manufactured and certified to Australian Standards by an international certification body and compliance is certified and available on request in key areas including; AS 2208 – Safety glazing materials in buildings AS 4666 – Insulated glass units