Top Causes of Commercial Roof Leaks in Oakville You Should Know

Commercial roof leaks can disrupt business operations, damage property, and result in costly repairs. For property owners and managers handling commercial roofing in Oakville, understanding the most common causes of leaks is essential for proactive maintenance and long-term protection.



1. Aging Roofing Materials

All roofing materials degrade over time. Exposure to Ontario’s weather—sun, snow, rain, and wind—weakens membranes, flashing, and seams. As your roof ages, it's more prone to cracking, splitting, and general wear that leads to leaks.

2. Poor Installation

Improper installation is a leading cause of early roof failure. When roofing materials aren’t installed to manufacturer specifications, or flashing is incorrectly applied, leaks become more likely. Always work with experienced, certified contractors who specialize in commercial roofing in Oakville.

3. Ponding Water

Flat or low-slope roofs are especially susceptible to water accumulation, also known as ponding. If drains are clogged or the roof doesn't slope correctly, standing water can slowly deteriorate the roofing membrane, leading to leaks.

4. Damaged Flashing and Seals

Flashing protects vulnerable areas like vents, chimneys, and edges. Over time, it can corrode, lift, or become detached due to temperature fluctuations and shifting materials. Even small gaps in flashing can allow water to seep in.

5. Roof Penetrations

HVAC units, skylights, and pipes all require penetrations through the roof, which are potential weak spots if not sealed properly. Over time, these seals can dry out, crack, or shrink—creating entry points for water.

Prevention Is Key

Routine inspections and maintenance are critical to avoiding leaks and extending the life of your commercial roof. If you're overseeing commercial roofing in Oakville, catching these issues early can save thousands in repair and restoration costs.


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