Solar heat gain coefficient for windows - Build 189 (2022)
- Abbreviation
- Solar heat gain coefficient for windows - Build 189 (2022)
- Valid from
- 1/04/2022
- Information provider
- BRANZ Limited,
- Author
- John Burgess
- Information type
- BUILD article,
- Format
- Website, PDF,
Description
Summer overheating is becoming a problem in many of our houses. Designers should consider the solar heat gain coefficient when selecting glazing to help reduce this risk.
MBIE has modified New Zealand Building Code clause H1 Energy efficiency to increase the amount of insulation used in the roof, walls, windows and floors of new homes.
BRANZ helped create Table E.1.1.1 in the 5th edition of clause H1/AS1, which contains a range of R-values for typical glazing systems used in New Zealand homes. These figures show what sort of window and glazing systems are required to meet the increased R-values for windows.
Scope
This article includes:
- No regulation of heat flow by radiation
- Coefficients and R-values for windows
- Design to reduce overheating