Quebec Condo Roof Maintenance: Roofs and Drains

Roofs and roof drains are critical elements in a divided co-ownership. A well-planned maintenance program reduces leaks, protects the building and optimizes the budget. In this article, we cover Quebec condo roof maintenance, the responsibilities of the syndicate and co-owners, and best practices for the board of directors (board).

Montreal and the South Shore experience freeze-thaw cycles, heavy rainfall and periods of high winds. These conditions require increased monitoring of roofs, membranes and drains. Rigorous preventive maintenance, recorded in the maintenance logbook (EUC), remains the best protection against damage, cost overruns and unexpected increases in common expenses.

Who is responsible for the roof and drains in a divided co-ownership?

• Roof and roof drains: usually common portions. Unless the declaration of co-ownership (DCV) provides otherwise, the membrane, insulation, waterproofing, drains and overflow drains form part of the common portions.
• Common portions for restricted use: certain accessible terraces or roof terraces may be for restricted use, but the underlying waterproofing generally remains common. Always check your DCV and the plans.
• Role of the syndicate: the syndicate’s purpose is to preserve the building and maintain and administer the common portions (see section 1039 of the Civil Code of Quebec, LégisQuébec). In practice, the board plans, approves and supervises the work, then reports on it in the minutes and at the annual general meeting.

Useful references:
– LégisQuébec – Civil Code of Quebec: purpose of the syndicate (see section 1039 of the Civil Code of Quebec)
https://www.legisquebec.gouv.qc.ca/fr/document/lc/CCQ-1991?langCont=fr#art1039

If in doubt (e.g., an interior stormwater stack, drain outlet or ventilation), consult the DCV and, if necessary, a professional (technologist, architect or engineer) to classify the portion as common or private. This classification determines who pays and who authorizes the work.

Preventive maintenance program: inspections, frequency and documentation

A clear annual plan avoids surprises. The board should incorporate these tasks into the maintenance logbook (EUC) and have them recorded in the minutes.

• In the spring: conduct a visual inspection after the snow melts. Check the membrane, flashings, joints, upstands and overflow drains. Remove debris and leaves blocking the drains.
• In the fall: thoroughly clean the drains and strainers, inspect the vents and check low-lying areas where water accumulates.
• After extreme events: thunderstorms, high winds, hail or heat waves. Document any sagging, blistering, tearing or water accumulation.
• Winter: safely clear the overflow drains if accumulation occurs. Avoid walking directly on an icy membrane. Use qualified contractors, especially for snow and ice removal.

Indicative table (adapt according to your building):

Management best practices:

• Standardize inspections using a checklist and dated photos. Keep the reports in the maintenance logbook (EUC).
• Have the board approve the schedule and budget, then inform the co-owners. Record decisions in the minutes and present a progress update at the annual general meeting.
• Require contractors to hold an appropriate Regie du batiment du Quebec (RBQ) licence (roofing) and liability insurance.

Resources:
– Regie du batiment du Quebec (RBQ) – Roofing contractor licence (class 9.3):
https://www.rbq.gouv.qc.ca/entrepreneurs/licences-et-classes/classe-9/9-3-couverture.html
– RGCQ – Co-ownership maintenance best practices:
https://rgcq.org/

Budget, common expenses and contingency fund

Planned maintenance reduces damage and stabilizes condo fees. Financial planning should combine:

• Operating budget: inspections, drain cleaning and minor repairs. These recurring expenses are funded through annual common expenses.
• Contingency fund: replacement of the membrane, raising of upstands, replacement or renewal of insulation, and replacement or repair of flashings. The contingency fund covers major repairs and the replacement of common portions (see section 1071 of the Civil Code of Quebec, LégisQuébec).
• Useful-life study: service life of components (membrane, insulation, drains and accessories). Adjust contributions accordingly and document the assumptions in the maintenance logbook.

References:
– LégisQuébec – Civil Code of Quebec: contingency fund (see section 1071 of the Civil Code of Quebec)
https://www.legisquebec.gouv.qc.ca/fr/document/lc/CCQ-1991?langCont=fr#art1071

Practical advice for the board:

• Estimate the service life: a membrane can last 15-25 years depending on the type and maintenance. Montreal’s climate accelerates wear at drainage points and upstands.
• Group the work: coordinate the membrane, insulation and upstands to limit repeated mobilizations and reduce the risk of leaks between phases.
• Insurance: check exclusions related to inadequate maintenance. A leak caused by a blocked drain may be considered preventable. Adjust the deductible according to the claims history.

To better understand how structured management fits into your operations, see our operations management services and all our services. You can also browse related topics on our blog.

Procedures in the event of a leak or emergency

Despite good maintenance, damage can occur. Proceed step by step, then document everything in the syndicate’s records.

1. Ensure safety and limit the damage
   • Remove the water, protect the affected private portions and shut off the local electrical supply if necessary.
   • Temporarily clear the strainer if it is safe to do so.
2. Call on the right resources
   • Call a roofing contractor holding an RBQ licence for emergency work.
   • Have professional drying performed if water has penetrated the building envelope or interior finishes.
3. Document and report
   • Take photos/videos and note the weather, time and exact location of the overflow or breach.
   • Notify the syndicate’s insurer and, if required, the insurer of the affected co-owner. Keep all reports and invoices.
   • Record the incident in the board minutes and present a report at the next annual general meeting, with preventive recommendations.
4. Corrective measures
   • Identify the cause (blocked drain, insufficient slope, defective flashing, upstand that is too low or punctured membrane).
   • Make a lasting repair and schedule a post-work inspection.

Resource:
– LégisQuébec – Co-ownership insurance provisions (co-ownership section of the Civil Code of Quebec)
https://www.legisquebec.gouv.qc.ca/fr/document/lc/CCQ-1991?langCont=fr

By-laws of the immovable and co-owner best practices

The by-laws of the immovable may specify roof access, required conduct and prohibitions to protect the membrane.

• Roof access: restricted to contractors and authorized personnel. Uncontrolled access damages the membrane and increases risks.
• Equipment and penetrations: any installation (antenna, HVAC or panel) requires the syndicate’s authorization and an approved technical detail. Anchors and sealants must be installed by qualified contractors.
• Maintenance of common portions for restricted use: if a roof terrace is for restricted use, the co-owner must comply with the rules of use (no sharp objects or planters without protection). The waterproofing remains the responsibility of the syndicate, unless the DCV expressly provides otherwise.
• Communication: post the procedure for quickly reporting a leak at the entrance. The caretaker or condominium manager must have an emergency call sheet.

To structure these rules and integrate them into your syndicate’s operations, see how we support syndicates in Montreal with operations management and compare our packages based on the size and complexity of your divided co-ownership.

FAQ – Condo roofs and roof drains

Q1. Who pays to replace a roof drain?
As a general rule, the roof drain, its strainers and overflow drains form part of the common portions. Their replacement is therefore paid by the syndicate through common expenses or the contingency fund, subject to the DCV.

Q2. Can privately owned equipment installed on the roof (e.g., an HVAC unit) change the responsibilities?
The equipment may be private, but the underlying membrane and waterproofing remain common. Any penetration must be authorized by the syndicate and carried out by a qualified contractor to avoid transferring a leak risk to the syndicate.

Q3. How often should roof drains be cleaned?
Twice a year (spring and fall), and after periods of high winds or heavy leaf fall. Test the flow at problem points and record everything in the maintenance logbook with photos.

This article provides general information and does not constitute legal advice. For your situation, consult a lawyer or notary. (updated 2026-07-07)

This article provides general information and does not replace advice from a tax professional or accountant. Refer to Revenu Quebec and the CRA for the exact rules. (updated 2026-07-07)

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