Complete flat roof solutions for residential and commercial properties in Greater Montreal. Elastomeric membrane, TPO, and modified bitumen systems built for Quebec conditions.
Flat roofs are extremely common across Montreal, particularly on the duplexes, triplexes, and low-rise commercial buildings that define much of the city's architectural character. These roofs demand specialized knowledge because they handle water drainage differently than sloped roofs and face unique challenges from Quebec's climate. Our team has deep experience with all major flat roofing systems, including elastomeric membrane (the most popular choice in Quebec), TPO, EPDM, and modified bitumen.
Each system has specific advantages depending on the building type, budget, and performance requirements. Elastomeric membrane roofing, applied in two coats with a reinforcing fabric between them, creates a seamless, waterproof surface that flexes with temperature changes -- critical in a climate where temperatures can swing from minus thirty to plus thirty-five Celsius across the year. For commercial applications and larger flat surfaces, TPO membrane offers excellent energy efficiency with its reflective white surface, reducing cooling costs in summer.
Proper flat roof installation starts with the substrate. We inspect and repair the roof deck, ensure adequate slope for drainage (even flat roofs should have a slight pitch toward drains or scuppers), and install vapor barriers and insulation before the membrane goes down. Ponding water is one of the biggest threats to flat roofs in Montreal, and we design every installation to move water off the surface efficiently. We also handle flat roof maintenance, including annual inspections, membrane patching, drain clearing, and seam repairs. Regular maintenance extends the life of a flat roof significantly and catches small problems before they become expensive failures.
Why this service
Specialized expertise in Montreal flat roof systems
Elastomeric, TPO, and modified bitumen options
Proper drainage design to prevent ponding water
Energy-efficient membrane options available
Maintenance programs to extend roof life
Residential and commercial flat roof service
FAQ for this service
Elastomeric membrane is the most popular and well-proven choice for Montreal residential flat roofs. It handles freeze-thaw cycles well, creates a seamless waterproof surface, and can be applied over existing roofing in some cases. For new installations, it offers strong long-term performance at a reasonable cost.
A properly installed elastomeric membrane flat roof typically lasts 20 to 25 years in Quebec. TPO systems can also reach 20 to 25 years. Regular maintenance including annual inspections and prompt repair of any damage is essential to achieving maximum lifespan.
Ponding water usually results from inadequate slope, blocked drains or scuppers, or structural settling that creates low spots. Even flat roofs should have a slight slope toward drainage points. We can correct ponding issues by improving drainage pathways or adding tapered insulation.
Often, yes. If the membrane is in generally good condition with localized damage such as blisters, cracks, or small tears, patch repairs can extend the roof life by several years. We assess the overall condition and recommend repair or replacement based on extent of issues.
In most Montreal boroughs, replacing a roof on the same footprint does not require a permit. However, if structural work is involved or if the building is in a heritage zone, permits may apply. We verify requirements for your specific borough during planning.