33.5. Warning line instead of a guardrail: Despite section 33.3, during roofing work, a warning line complying with section 354.1 may be installed to replace the use of a guardrail and delimit a work area on a roof with a slope equal to or less than 15° 3/12).
In such a case, another recognized protection mechanism against falls, such as a safety harness secured to an anchorage system by a fall arrest connecting device in accordance with section 347 shall be used outside the area delimited by the warning line.
1411-2018O.C. 1411-2018, s. 161.