Your roof protects your home from Montreal’s harsh winters and hot summers. Choosing the right roofing material directly influences your property’s durability, your maintenance costs and your comfort. With six main options available – from economical asphalt shingles to prestigiousslate – it can be difficult to know which solution is right for your situation.
This guide simply explains the advantages of each type to help you make an informed decision.
Key points to remember
- Asphalt shingles are still the most economical and popular choice for sloped roofs in Montreal.
- Elastomeric membrane offers the best waterproofing for flat duplex and triplex roofs
- Green roofs are encouraged by the city and can benefit from municipal subsidies.
- Metal roofing lasts the longest (40-70 years) and facilitates snow evacuation
- Each material is suitable for different situations, depending on your type of roof and your priorities.
What material should you choose for your Montreal roof?
Each material has a unique profile in terms of cost, durability, maintenance and performance. To help you get a clearer picture, we’re going to take a look at metal roofing, asphalt shingles, elastomeric membranes, green roofs and slate, point by point.
Asphalt shingles: the economical option
The asphalt shingles covers the majority of Montreal homes. Composed of fiberglass, asphalt and granules, it withstands the freeze-thaw cycles typical of our region.
Service life: 15 to 25 years, depending on quality. Architectural shingles offer the best resistance.
Advantages: fast installation, wide choice of colors, minimal maintenance, excellent value for money. Ideal for residential properties
Metal roofing for maximum durability
The metal roofing is gaining in popularity in Montreal. Its smooth surface naturally evacuates snow, reducing the risk of accumulation.
Service life: 40 to 70 years. This is the most durable option.
Advantages: incombustible, excellent solar reflection (reduces air conditioning), 100% recyclable, low maintenance. Snow guards recommended for safety.
Slate roofing: prestige and longevity
L’natural slate decorates high-end properties in Westmount and Outremont. Non-combustible and waterproof, it lasts from 75 to 150 years.
Requires reinforced framework and specialized craftsmen. Suitable for heritage buildings.
Ecological membranes and roofs
Elastomer membrane: superior sealing
The elastomeric membrane dominates the Montreal flat roof market. Applied with a blowtorch, it offers exceptional watertightness.
Service life: 25 to 35 years. Choose a two-layer membrane for maximum protection.
Installation by RBQ-certified roofers. Biennial inspections are recommended.
Green roof: the ecological option
Visit green roofs combine membrane, drainage and vegetation. They reduce heat islands, improve insulation and extend the life of the membrane.
The city offers subsidies. Consult sustainable development projects. Requires structural evaluation (load 70 to 200 kg/m²).
Which material is right for your situation?
| Your situation | Recommended material | Why |
| Single-family home, limited budget | Asphalt shingles | Optimum value for money, fast installation |
| Duplex or triplex, flat roof | Elastomer membrane | Proven seal, lasts 25-35 years |
| Long-term investment, pitched roof | Metal roofing | Lasts 40-70 years, evacuates snow well |
| Environmental priority | Green roof | Heat island reduction, subsidies available |
| Heritage property | Natural slate | Authenticity, lasts 75-150 years |
Municipal regulations
Several Montreal boroughs require certain materials (white roofs, grey roofs, green roofs) when refurbishing or building a flat roof to reduce urban heat islands. Requirements vary by borough and building type.
No permit required for an identical replacement. Permits required if you are changing the material or working in a heritage district. Consult the Ville de Montréal Roofing page for by-laws specific to your borough.
Common mistakes to avoid
- Choose by price only: Calculate the cost per year of life rather than the initial purchase price.
- Neglect ventilation Poor ventilation reduces the lifespan of all materials and encourages mould growth.
- Do-it-yourself installation: Faulty installation voids warranties and causes costly problems. Work requires an RBQ license.
What’s next?
Assess your situation
Identify your roof type (flat or pitched), your expected length of ownership and your priorities (economy, sustainability, environment). Consult your borough’s by-laws before deciding.
Plan at the right time
The best time to re-roof in Montreal is from May to October. Book your contractor as early as March to avoid summer delays.
Best maintenance practices
Inspect twice a year: in spring and fall. Look for damaged shingles, debris buildup or signs of infiltration.
Clean the gutters: clogged gutters cause water to back up and damage the roof and structure.
Remove excess snow: more than 60 cm of snow on a flat roof is a dangerous weight. Have snow removed by professionals.
Act quickly: a small problem that goes unrepaired can quickly get worse. A minor infiltration can cause thousands of dollars in structural damage.
Make the right choice for your roof
Each roofing material meets different needs. Asphalt shingles suit tight budgets, elastomeric membrane excels on flat roofs, metal roofing offers the best durability, and green roofs contribute to the environment.
The important thing is to choose according to your actual situation: type of building, expected length of ownership and personal priorities. A qualified contractor will be able to evaluate your roof and recommend the best option for you.
Need personalized advice?
If you’re not sure which material is right for your property, or would like an assessment of your current roof, our team can help you understand your options and recommend the next steps that are right for you.
Contact us at and we’ll take the time to explain each solution clearly.
Frequently asked questions
What is the average lifespan of a roof in Montreal?
This depends on the material: asphalt shingles 15-25 years, elastomeric membrane 25-35 years, metal roofing 40-70 years, slate 75-150 years. Montreal’s harsh climate can shorten these times if installation or maintenance is inadequate. Adequate ventilation and regular inspections extend service life.
Do I need a permit to re-roof in Montréal?
No, generally not if you’re replacing the same thing. A permit is required if you’re changing the material, modifying the structure/slope, installing a green roof, or working in a heritage district. Check with your borough. The contractor must always hold a valid RBQ license.
Are white roofs mandatory in Montreal?
Since 2020, yes for new commercial, institutional and industrial buildings (2,000 m²+) and 3-storey+ multi-family buildings during renovation. Single-family homes and duplexes are generally not covered. Consult your borough by-laws to confirm.
How do I choose an RBQ-certified roofer in Montreal?
Check for a valid RBQ license (subclass 4.2) at rbq.gouv.qc.ca. Ask for proof of liability and CNESST insurance.
What's the best season for re-roofing in Montreal?
May to October, with preference for June and September. These months offer stable temperatures (15-25°C) ideal for all materials. Avoid heat waves and winter. Book your contractor as early as March to avoid waiting times of 6-8 weeks in high season.
