Flat roofs are sleek, modern, and a practical choice for many homes and commercial buildings in London, Ontario. But when it comes to upkeep, they need a little more TLC than sloped roofs. If your flat roof has started leaking or showing signs of wear, it might be time to reseal—and choosing the right material is key to long-term performance.
Whether you’re exploring roof replacement services, searching for roof repair services near me, or just want to get ahead of future issues, this guide will walk you through the top five materials used to reseal flat roofs—and how to know which one fits your home and budget.
1. Modified Bitumen
Modified bitumen is one of the most popular flat roofing materials in Canada. It’s a type of asphalt product reinforced with fibreglass or polyester, offering strong waterproofing and UV resistance.
It’s applied in layers, either with a torch or cold adhesive, making it a tough choice for London’s freeze-thaw cycles. Many roofing companies favour it for its reliability and moderate cost.
Best for: Homeowners wanting solid, budget-friendly protection that holds up in extreme weather.
2. EPDM Rubber Roofing
EPDM (ethylene propylene diene terpolymer) is a synthetic rubber membrane that’s rolled out and adhered to your roof surface. It’s known for its durability and flexibility—making it a great match for those wild Ontario winters.
This lightweight material is ideal for both residential and commercial use and is commonly used by roofers in London Ontario for quick repairs or reseals.
Best for: Flat roofs with minimal foot traffic and high exposure to sun or temperature swings.
3. TPO (Thermoplastic Polyolefin)
TPO is a newer, energy-efficient roofing material that’s growing in popularity. Its white, reflective surface helps reduce heat absorption, lowering your cooling costs in the summer.
Although it’s a bit pricier than EPDM, it provides strong puncture resistance and works well with homes that have AC units or rooftop structures.
Best for: Homeowners focused on energy savings and a modern aesthetic.
4. Spray Polyurethane Foam (SPF)
SPF is a liquid that’s sprayed directly onto the roof, expanding into a solid foam. It seals cracks, gaps, and seams like a charm and creates a seamless, waterproof barrier.
This is a great option for older flat roofs that have developed small leaks or ponding issues. It also adds insulation value, helping to cut down heating bills during London’s chilly winters.
Best for: Older roofs needing both sealing and insulation upgrades.
5. Metal Roofing for Flat Roof Edges and Extensions
While metal roofing is usually associated with sloped roofs, it can be incorporated into flat roofing systems—particularly along edges, overhangs, or for low-slope transitions.
If you’re already considering metal roofing as part of a full roof replacement, it can be integrated to boost durability and improve runoff at transition points.
Best for: Hybrid roof systems or homes upgrading from traditional flat roofing materials.
How to Know When It’s Time to Reseal Your Flat Roof
If you’re spotting water stains on ceilings, pooling water after rain, blistered or cracked membranes, or your roof just looks tired, it’s time to call the pros. Quick action helps avoid major damage to insulation, drywall, and even electrical systems.
Working with reputable roofing companies in London ensures your reseal is done right—no guesswork, no shortcuts, and no repeat issues a few months later.
At AM Group Exteriors, we’ve helped countless homeowners across Ontario extend the life of their flat roofs through expert repairs, resealing, and full replacements. We’ll walk you through material options and give you honest advice based on your roof’s age, condition, and future goals.
Feel free to reach out to us via email, phone, or through the contact form. Our team is here to assist you with any inquiries you may have.
If you are looking for an emergency repair, please give us a call at +1 877-389-2812.
FAQs
Depending on the material, a flat roof reseal can last anywhere from 10 to 30 years. EPDM and modified bitumen generally last longer with proper care.
We wouldn’t recommend it. Flat roof sealing involves specific materials, tools, and techniques that only trained professionals can handle properly—especially in our harsh Ontario climate.
Yes. Resealing is often a cost-effective alternative if your roof structure is still sound. But if the damage is too far gone, replacement might be the smarter long-term option.
EPDM and modified bitumen both handle snow well, but proper drainage is just as important. Make sure your roof has a good slope and working drains.
Look for established roofing companies with experience in flat roofing systems, verified customer reviews, and proper licensing. AM Group Exteriors checks all those boxes and more.
