The Ontario Building Code | Service Lines under Buildings service Lines under buildings

(1) A building shall not be constructed over an existing buried flammable gas main unless the gas main is encased in a gas-tight conduit in conformance with CAN/CSA-Z662 / Z662.1, "Oil and Gas Pipeline Systems / Commentary on CAN/CSA-Z662-11, Oil and Gas Pipeline Systems".

3.2.4. Fire Alarm and Detection Systems