7.4.10.10.Hydraulic Loads to Roof Gutters

(1) The hydraulic load that is drained to a roof gutter shall conform to Table 7.4.10.10.

                                                      Table 7.4.10.10.
                                  Maximum Permitted Hydraulic Load Drained to a Roof Gutter
                                              Forming Part of Article 7.4.10.10.

                                                                                 Maximum Hydraulic Load, L
         Nominal Pipe Size of Gutter,
                                            Area of Gutter,cm3                             Slope
                    NPS
                                                                 1 in 200      1 in 100           1 in 50        1 in 25
                      3                           22.8             406           559               812           1 140
                      4                           40.5             838          1 190             1 700          2 410
                      5                           63.3            1 470         2 080             2 950          4 170
                      6                           91.2            2 260         3 200             4 520          6 530
                      7                           124.1           3 250         4 600             6 500          9 190
                      8                           162.1           4 700         6 600             9 400          13 200
                     10                           253.4           8 480        12 000             17 000         23 600

This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.

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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.