Where minimum R-values are set by code, high percentages of glazing may only be possible with high-performance fiberglass windows. The graph below compares the impact of four different window types (aluminum vs fiberglass) on overall building R-value, showing that Cascadia windows can significantly increase the overall R-value of the building enclosure:

View Graph 

See Energy Ratings for our standard products, and download our technical bulletins below for information on Cascadia windows and ASHRAE standards:

• Technical Bulletin 1a - Achieving ASHRAE 90.1-2004 Compliance
• Technical Bulletin 1b - Achieving ASHRAE 90.1-2007 Compliance