What the City says for Anjou
The City procedure fits in one sentence for this borough. You need no permit to repair, maintain, renovate or replace a flat or low-slope roof. A roof falls into this category when its slope is under 2:12, or 16.7%.
This rule covers the roof itself. Other work on the building may still go through a permit application.
The three allowed coverings
The City presents this list as the only roofing materials allowed on flat roofs in Anjou.
- A material that is white, painted white, or covered with a reflective coating or white gravel.
- A material with an SRI of at least 78, confirmed by the manufacturer's specifications.
- A green roof, meaning a vegetated roof.
It is up to us to show which of the three boxes the product we propose fits into.
The SRI threshold of 78
The SRI measures how well a surface sends the sun's heat back instead of absorbing it. The higher the number, the less the roof heats up in summer.
In Anjou, the City sets the threshold at 78 and says how to prove it, through the manufacturer's specifications. For a product that is not white, a light colour is not proof enough. You need the product data sheet, where the index is written.
Before signing, check that the quote contains three things.
- the exact name of the cap sheet or finishing product
- the manufacturer's data sheet, with the SRI
- a statement that the covering meets the Anjou borough list
Keep these papers with the invoice. No permit is required in Anjou to redo a flat roof, so these papers are your only proof that the roof was redone with a compliant material.
What the page does not specify
For Anjou, the procedure consulted is silent on several points.
- whether a small repair on an old dark roof must use a material from the list
- any written exception for the part of the roof taken up by a deck or a mechanical unit
- whether two of the allowed coverings can be combined on the same roof
- any specific process for installing a green roof
- work that touches the insulation or the structure
The Anjou permit counter, at 7171, rue Bombardier, 2nd floor, answers these questions. The counter receives by appointment only.
Frequently asked questions
My flat roof is black. Do I have to redo it in white?
The City page does not say an existing roof must be changed. It gives the list of the only coverings allowed. When the time comes to redo it, the new material will have to be on the borough's list.
Is white gravel enough?
Yes, according to the City list, a material covered with white gravel is one of the coverings allowed in Anjou, just like a white or white-painted material.
Who checks that the material complies if there is no permit?
The City page describes no check. Require the data sheet and have it written into the quote. If a product is in doubt, the permit counter decides. Do not go up on the roof to look. Ask us for photos.
Official sources, consulted October 3, 2026: