Code Library › Volume 1 › Section 12.3 — Energy Efficiency for Buildings of

PART 12 — RESOURCE CONSERVATION AND ENVIRONMENTAL INTEGRITYUpdated for the 2024 Ontario Building Code

12.3.1.2.Windows and Sliding Glass Doors

(1) The energy rating and the overall coefficient of heat transfer required for windows and sliding glass doors shall be
  determined in conformance with
  (a) CSA A440.2, “Fenestration Energy Performance,” or
  (b) NFRC 100, “Procedure for Determining Fenestration Product U-factors” and NFRC 200, “Procedure for
       Determining Fenestration Product Solar Heat Gain Coefficient and Visible Transmittance at Normal Incidence.”

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.