About this chapter: Chapter 3 covers general regulations for energy conservation features of buildings. The climate zone for a building is established by geographic location tables and figures in this chapter.
Exception: Where required, garage door U-factors shall be determined in accordance with either NFRC 100 or ANSI/DASMA 105.
U-factors shall be determined by an accredited, independent laboratory, and labeled and certified by the manufacturer.
Products lacking such a labeled U-factor shall be assigned a default U-factor from Table R303.1.3(1) or R303.1.3(2). The solar heat gain coefficient (SHGC) and visible transmittance (VT) of glazed fenestration products such as windows, glazed doors and skylights shall be determined in accordance with NFRC 200 by an accredited, independent laboratory, and labeled and certified by the manufacturer. Products lacking such a labeled SHGC or VT shall be assigned a default SHGC or VT from Table R303.1.3(3).
DEFAULT GLAZED WINDOW, GLASS DOOR AND SKYLIGHT U-FACTORS
|FRAME TYPE||WINDOW AND|
|Metal with Thermal Break||1.10||0.65||1.90||1.10|
|Nonmetal or Metal Clad||0.95||0.55||1.75||1.05|
DEFAULT OPAQUE DOOR U-FACTORS
|Insulated, nonmetal edge, not exceeding 45% |
glazing, any glazing double pane