Flat roof replacements with waRRANTY

Is it time to replace your Flat roof?

Here’s our process:

A blue brick building with a balcony and a large sign that reads 'EVALUATE' partially visible.

Before a flat roof replacement, Roofing-MTL performs a full evaluation to assess the roof’s current condition, identify underlying issues, and confirm the most effective replacement approach for your property.

View of a building rooftop with brick walls, some construction materials, and outdoor furniture, including chairs and a barbecue grill, with a large white overlay and text reading 'PLAN'.

Planning involves choosing the right roofing system, materials, drainage approach, and timeline for the project, while Roofing-MTL ensures everything is tailored to your building and budget for a smooth, efficient installation.

Close-up of a person's hand wearing a glove and a textured sleeve, touching the water surface of a frozen lake or pond, with the word 'INSTALL' overlaid at the bottom and the number '3' in large font on the right side.

Installation starts with safely removing the existing roofing layers down to a sound base, followed by preparing and repairing the roof deck as needed. Roofing-MTL then installs the new flat roofing system in carefully sealed layers, with attention to insulation, waterproof membranes, flashing, and drainage.

Close-up of a sign with the words "FOLLOW UP" displayed in large white letters, partially obscured by a large white number 4 overlay. The sign appears to be outdoors on a textured blue surface, with a gray structure visible to the right.

Follow-up includes a post-installation inspection by Roofing-MTL to confirm the new flat roof is properly sealed, draining correctly, and performing as expected, with any final adjustments made if needed, and all work is backed by a warranty of up to 15 years for added peace of mind.

FAQ: What to know about flat roof replacements

  • Most flat roofs last between 15 and 30 years, depending on the material used, the quality of the installation, and how well the roof is maintained.

  • You’ll know your flat roof needs replacement when you start seeing recurring leaks, standing water, visible cracks or blisters in the membrane, or widespread wear that repairs can no longer reliably fix—Roofing-MTL will do an evaluation to determine the overall condition and next steps for your roof.

  • Flat roof replacements typically cost between $10 and $22 per square foot in Montreal, depending on the size, materials, and condition of the existing roof—Roofing-MTL will provide a detailed evaluation to give you an accurate quote. All flat roof replacements come with a full warranty.

  • The process usually starts with a roof inspection and assessment to understand the current condition, identify any leaks or structural issues, and determine whether a repair or full replacement is needed. From there, Roofing-MTL will provide a clear recommendation, material options, and a detailed quote so you can plan the project with confidence.

  • When planning a flat roof replacement, the main decisions come down to a few key areas that affect performance, cost, and longevity.

    You’ll need to choose the roofing system (such as modified bitumen, EPDM, TPO, or elastomeric membranes), decide whether to replace or upgrade insulation, and consider if any structural repairs or slope corrections are needed to improve drainage. You’ll also need to think about warranty level and maintenance expectations, since different systems offer different long-term protection.

    Roofing-MTL can walk you through these options during an on-site evaluation and help you choose the best setup for your building and budget.

  • Roofing-MTL offers warranties of up to 15 years, giving you long-term protection and peace of mind after your roof is installed.