PART 7 — PLUMBINGUpdated for the 2024 Ontario Building Code
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7.3.4.9.Thrust Restraint of Water Service Pipes (See Note A-7.3.4.9.)
(1) Pipe clamps and tie-rods, thrust blocks, locked mechanical or push-on joints, mechanical joints utilizing set screw
retainer glands, or other suitable means of thrust restraint shall be provided at each change of direction of a water service
pipe NPS 4 or more and at all tees, plugs, caps and bends.
(2) Backing for underground water service pipes shall be placed
(a) between undisturbed earth and the fitting to be restrained and shall be of sufficient bearing area to provide adequate
resistance to the thrust to be encountered, and
(b) so that the joints will be accessible for inspection and repair.
(3) Concrete thrust blocks shall have a minimum compressive strength of not less than 10 MPa after 28 days.
(4) Thrust blocks shall not be used to restrain vertical pipe.
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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.