Commercial Roofing FAQ – Your Markham Questions Answered

How often should I schedule commercial roof maintenance in Markham?

We recommend comprehensive commercial roof maintenance at least twice per year—once in spring after freeze-thaw cycles have finished, and again in fall before winter arrives. Ontario's climate puts significant stress on commercial roofing systems through temperature extremes, ice damming, and snow accumulation. Regular inspections catch small issues before they escalate into costly emergency roof repair situations.

For flat roof systems common on retail plazas, industrial buildings, and multi-unit residential properties, quarterly inspections often prove more cost-effective. Ponding water, membrane degradation, and drainage issues develop faster on low-slope roofs and benefit from more frequent professional attention.

What's the difference between TPO and EPDM roofing for my commercial building?

Both TPO roofing and EPDM roofing are proven single-ply membrane systems ideal for flat and low-slope commercial applications. EPDM (ethylene propylene diene monomer) is a black rubber membrane with exceptional durability and a track record spanning decades. It performs exceptionally well in cold climates and handles our Canadian winters reliably.

TPO (thermoplastic polyolefin) is a white or light-colored membrane that reflects more sunlight, potentially reducing cooling costs during summer months. TPO's heat-welded seams create watertight bonds that resist separation over time. Both systems offer excellent value, but the right choice depends on your building's specific needs, energy goals, and budget.

During a professional roof inspection, we assess your existing conditions, insulation requirements, and long-term maintenance expectations to recommend the most suitable membrane system.

Do I need permits for commercial roof replacement in Markham?

Most commercial roof replacement projects require building permits from the City of Markham. Permit requirements ensure that roofing work meets current building codes, fire safety standards, and structural load requirements—especially important given snow load considerations in our region.

Professional roofing contractors handle permit applications as part of the project scope. We coordinate with municipal inspectors, ensure proper documentation, and verify that all work complies with Ontario Building Code requirements. Re-roofing without proper permits can create liability issues, void insurance coverage, and complicate future property transactions.

When should I consider roof repair versus full roof replacement?

Roof repair makes financial sense when damage is localized—a small puncture, isolated flashing failure, or minor membrane tear. For buildings under 15 years old with otherwise sound roofing systems, targeted repairs extend service life cost-effectively.

Full roof replacement becomes necessary when:

• The membrane shows widespread deterioration or brittleness
• Multiple leaks indicate systemic failure
• The roof has reached or exceeded its expected lifespan
• Insulation is saturated or inadequate by current standards
• Repeated repairs become a recurring expense

A thorough roof inspection provides the data needed to make informed decisions. We document conditions with photos, moisture scans, and core samples when necessary, giving you a clear picture of whether repair or replacement delivers better long-term value.

What warranties should I expect with flat roof installation?

Quality flat roof installation comes with two distinct warranty types: manufacturer material warranties and contractor workmanship warranties. Material warranties from reputable manufacturers typically range from 10 to 30 years depending on the membrane system selected. These cover defects in the roofing materials themselves.

Workmanship warranties protect against installation errors and typically span 5 to 10 years. Licensed, professional contractors stand behind their work with comprehensive labor warranties. Always verify that warranties are transferable if you sell the property, and understand maintenance requirements that keep warranties valid.

We provide detailed warranty documentation and explain coverage terms clearly before work begins, ensuring you understand exactly what protection your investment receives.