On a job site, accessing a roof or transferring workers to it using a mobile elevating work platform (MEWP; PEMP in French) is a routine operation — but a high-risk one. Depending on the work context, CNESST may require or review a documented work procedure to govern this work. Here's what that document is for, and why it's best prepared by an engineer.

Why a written procedure

Working at height is among the leading causes of serious accidents in construction. A work procedure isn't administrative paperwork: it's the tool that defines how the operation will be carried out safely, informs the crew, and serves as a reference in the event of a CNESST inspection. A clear procedure protects both the workers and the contractor.

What a roof access procedure (MEWP/PEMP) covers

A complete procedure goes well beyond "up and down." It typically specifies:

  • equipment selection and capacity (a PEMP suited to the height and load);
  • the safe transfer between the platform and the structure or roof, a particularly critical moment;
  • the anchor points and fall-protection equipment;
  • the work and exclusion zones at ground level;
  • the conditions (wind, ground condition, PEMP stability) and pre-use checks;
  • the sequence of operations and everyone's responsibilities.

Why an engineer

Several of these elements — equipment capacity, anchors, stability, transfer onto a structure under construction — call for technical analysis. Having them validated or written by an engineer brings a rigour that CNESST and project owners value, and ensures the procedure reflects the structural reality of your site rather than a generic template.

Our team writes CNESST-compliant procedures — roof access with a PEMP, safe transfer, lifting and confined space — tailored to your site in the Quebec City and Lévis area.

Need a procedure for an upcoming job? Contact us.

This article is provided for information purposes. Procedures must be adapted to each site and comply with current CNESST regulations on work at heights, fall protection and mobile elevating work platforms.