7.2.7.4.Copper Tube

(1) Copper tube shall conform to,
     (a) ASTM B88, “Standard Specification for Seamless Copper Water Tube,” or
     (b) ASTM B306, “Standard Specification for Copper Drainage Tube (DWV).”

     (2) Except as provided in Sentence (3), the use of copper tube shall conform to Table 2.2.7.4.

                                                             Table 7.2.7.4.
                                               Permitted Use of Copper Tube and Pipe
                                           Forming Part of Sentences 7.2.7.1.(1) and 7.2.7.4.(2)

 Type of Copper Tube  Water Distribution System             Building            Drainage System               Venting System
       or Pipe       Underground Above-ground                Sewer        Underground     Above-ground   Underground   Above-ground
K & L hard temper            N                 P               P                P                  P         P              P
K & L soft temper            P                 P               N                N                  N         N              N
M hard temper                N                 P               N                N                  P         N              P
M soft temper                N                 N               N                N                  N         N              N
DWV                          N                 N               N                N                  P         N              P

Notes to Table 7.2.7.4.:
(1) P = Permitted and N = Not Permitted.

  (3) Copper tube shall not be used for the fixture drain or the portion of the vent pipe below the flood level rim of a
  urinal.

  (4) Copper tube used in a plumbing appliance shall conform to
  (a) ASTM B88, “Standard Specification for Seamless Copper Water Tube,” or
  (b) ASTM B68 / B68M, “Standard Specification for Seamless Copper Tube, Bright Annealed.”

  (5) Type K or L copper tube shall be used for the potable water side of a heat exchanger in a pre-engineered wastewater
  5eat recovery system.

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.