IECC CLIMATE ZONE
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NEW CLIMATE ZONES: Standard 90.1-2016 references the new ASHRAE Standard 169, Climate Data for Building Design Standards, providing an improved source for climatic data—now and into the future.
Two new weather zones are added (climate zone 0 A and B), along with corresponding prescriptive requirements.
More than 400 counties (out of 3,000 across the U.S.) were reassigned and remapped based on updated weather data.
A new annex is appended and contains extracts from various reference standards for the convenience of users, including tables and figures extracted from Standard 169-2013.
IECC ENERGY PRESCRIPTION
Additional: Toronto - Zone 6; Montreal - Zone 7; Vancouver - Zone 4C; Colorado - Zone 5B; Indiana - Zone 5A; City of Industry, CA -Zone 2B
2023 FBC Energy Conservation - 8th Ed. Chapter 402.4 Fenestration (Prescriptive) [click here]
The U-Factor measures how well the window insulates. While the U-Factor can take any value, in general for windows it ranges from 0.20 to 1.20. The lower the U-Factor, the better the window insulates.
The SHGC measures how much of the sun’s heat comes through the window. It can range in value from 0 to 1. The lower the SHGC, the less solar heat the window lets in.
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