2.3.3.2.Roof Areas of Greenhouses

(1) In a farm building classified as a Group G, Division 3 major occupancy where heating and drainage systems are
     installed to prevent the accumulation of snow and water, the supporting structure for the light-transmitting roof areas is
     permitted to be designed for a specified roof snow load of not less than 1 kPa, provided
     (a) the heating system is capable of maintaining a minimum interior temperature of 10°C throughout the farm building,
           and
     (b) an emergency power supply is provided that
             (i) is supplied from a power source such as batteries, a generator, or a combination thereof, and
            (ii) will continue to supply power to the heating system in the event that the regular power supply to the farm
                  building is interrupted.

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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.