Site directives
Clear management of site instructions to guide each technical intervention with precision
On a site, a vague or poorly conveyed instruction can lead to an execution error, a delay, a conflict between trades, or worse, work that has to be redone. The directive is the tool that lets each trade know exactly what to do, how to do it, and in what order.
It's the difference between a site that moves smoothly and one that gets bogged down in misunderstandings.
VP Expert-Conseil writes clear technical directives tailored to each context, so your contractors always have the right information before starting.
A well-drafted upfront directive costs a fraction of redoing work, and prevents conflicts between trades over what was planned or not.
To better understand
What exactly is a site directive?
A site directive is a written technical document that precisely defines what a trade must do, how to do it, with which materials, in what order, and against which quality criteria. It's not a simple email or a verbal note, it's an official instruction, dated and signed, that is part of the site file.
Plans show what must be built. The specification describes materials and costs. The directive explains how to execute the work, the methods, sequences, required protections and acceptance criteria. These three documents complement each other: without a directive, plans and specs often leave too much room for interpretation.
Directives can be issued before work begins (to frame the intervention), during execution (to respond to an unforeseen situation), or after a non-conformity (to define exactly how to fix the situation). In every case, they give trades a clear roadmap and the project owner a written trace of what was expected.
The real risks
What happens when directives are missing or vague
On site, the absence of clear directives is one of the most frequent causes of problems on building mechanical sites. Here's what we regularly observe.
Two subcontractors read the same plan and understand two different things. With no directive to settle it, each does it their own way.
A contractor uses a method that doesn't comply with standards, because no one specified which one to use.
Without a defined work sequence, trades step on each other's toes, creating delays and tension on site.
A contractor orders a different material because the directive didn't specify the exact required specifications.
Without a directive specifying containment or protection, occupied zones end up exposed to contaminants.
Without a written document defining expectations, it's impossible to settle what was included, and discussions turn into conflicts.
Redoing mechanical work already closed inside walls can easily cost three to ten times the price of the original execution, not counting delays, conflict-management fees and the impact on other trades. A well-drafted upfront directive costs a fraction of that.
The content
What a directive written by VP Expert-Conseil contains
Each directive is tailored to its context, there's no generic template. But here are the elements that consistently appear in our technical directives.
How the work must be done: required techniques, tools, sequence of operations, intermediate checkpoints.
Exact specifications of required materials: brand, model, rating, certification, to prevent any unauthorized substitution.
The order in which interventions must take place, and which steps must be verified before moving to the next.
Containment of work zones, protection of occupants, contaminant management, required PPE.
The minimum standards expected for each element of execution, what is acceptable and what is not.
How we verify the work is properly done: tests, measurements, inspections, documents to provide before closing the stage.
The three key moments
When do we issue a directive?
A directive isn't reserved for the planning phase. It can be issued at any point during the site, each situation has its own logic.
The preventive directive. It frames the intervention from the outset: methods, materials, sequences, protections. It's the ideal scenario, everyone knows where they're going before starting.
The corrective or adaptive directive. An unforeseen situation on site, a change in conditions, a method to adjust, we issue a directive to refocus without stopping the site.
The correction directive. When an anomaly is identified, the directive defines exactly how to correct it, to prevent the fix from creating a new problem.
How it works
From request to issued directive, step by step
The process for drafting a directive is structured and quick. Here's how it concretely works.
We start by understanding the context: available plans and specifications, the nature of the work, building constraints, regulatory obligations and the trades involved. This step lets us write a directive that matches site reality, not a theoretical situation.
Which elements are most likely to cause problems if poorly executed? Which standards apply and which are often misinterpreted? This analysis steers the directive's content toward what truly matters.
The directive is drafted in clear and direct language, precise enough to be understood by a technician on site, rigorous enough to be usable as an official document. It includes relevant methods, materials, sequence, protections and acceptance criteria.
Before being issued, the directive is submitted to the project owner for validation. This step ensures expectations are aligned and lets us adjust as needed, to clarify questions before they become problems on site.
The directive is officially issued, dated, numbered, signed, and distributed to all relevant trades. It joins the site file and serves as a reference document throughout the execution of the targeted work.
If site supervision is also mandated, our experts verify that the directive is correctly applied during visits. In case of deviation, a notice is issued. The goal is for what's written to be exactly what happens on site.
Our stance
Directives written without conflict of interest
A site directive written by the contractor themselves is a bit like asking someone to write their own rules of the game. VP Expert-Conseil doesn't perform the work, which lets us write directives that serve the project owner's interest, not the executor's.
Our directives are written based on applicable standards, industry best practices and the client's interests, not based on what's easiest or most profitable for a contractor to execute. That means material specifications without favoritism, methods that follow best practices, and acceptance criteria that protect the final quality of the work.
For whom and why it matters
Four situations where a directive changes the outcome
You hire a contractor for ventilation or mechanical work, but you don't have the technical knowledge to know if the job is done well. A site directive prepared by an independent expert sets expectations clearly from the start, protecting your interests and avoiding after-the-fact arguments.
If a disagreement arises with your contractor, you have a written document that defines exactly what was expected. It's concrete protection, written before the problem.
A well-written directive means fewer back-and-forths, less ambiguity on site and lower risk of costly mistakes. Clear technical directives for each trade let you coordinate your teams efficiently and deliver compliant work the first time.
It's also protection for you: if a subcontractor deviates from the directive, you have a document proving expectations were clearly defined and communicated. It completely changes the dynamic of any potential dispute.
Commercial renovations often involve multiple trades working in parallel in an operational building. Directives let us frame each intervention precisely: work methods, authorized time slots, occupant protection measures, containment procedures.
In sensitive environments like daycares, schools, senior residences or healthcare facilities, requirements around work are especially strict. The directives we produce account for each facility's specific protocols: protection of occupied zones, contaminant management, coordination with safety managers.
Everything is documented, traceable and defensible, which is often an explicit requirement of supervisory authorities, insurers or funders of the work.
What you receive
The documents produced
A site directive isn't an isolated document. It's part of a set of documents that form the site file, which stay useful long after the work is done.
Dated, numbered, signed by our experts. Applicable on site immediately upon distribution.
Confirmation of who received the directive and when, to avoid the "I didn't know" at handover.
Chronological tracking of all project directives, useful for retracing decision history in case of dispute.
In case of non-conformity, a correction directive specifies exactly how to bring the work back to standard.
All directives are added to the official file, an asset for the building that remains available to future managers and owners.
Structured to be accepted by authorities, insurers, project owners and funding agencies.
In summary
On a site, misunderstandings are expensive. A directive issued by VP Expert-Conseil eliminates the fog: each trade receives a clear technical roadmap, written by our experts, so the work unfolds according to what was planned without surprises, without slippage.
VP Expert-Conseil. Air quality. NADCA ACR 2025 certified.