Common Reasons Behind Roof Leaks in Commercial Buildings

Roof leaks are one of the most common and disruptive problems faced by commercial property owners. They can result in damaged equipment, interior water stains, mold growth, and even business interruptions. In Santa Monica, CA, where coastal weather and sun exposure add unique challenges, knowing the causes of commercial roof leaks can help you stay one step ahead of costly damage.

The Most Frequent Culprits

Understanding what leads to roof leaks allows you to prevent them before they threaten your business operations. Here are the most common causes of leaks in commercial buildings:

1. Damaged or Improper Flashing

Flashing is installed around roof penetrations like vents, skylights, HVAC units, and edges. If flashing becomes loose, corroded, or was installed incorrectly, water can easily seep into the building.

2. Membrane Punctures and Tears

Commercial roofs often use single-ply membranes (like TPO, EPDM, or PVC). Foot traffic, falling debris, or weather exposure can puncture or tear these surfaces, creating entry points for water.

3. Clogged Drains and Ponding Water

Water that doesn’t drain properly can sit on the surface of your roof, especially on flat or low-slope systems. This ponding water breaks down roofing material over time and creates perfect conditions for leaks.

4. Aging Roofing Systems

Even the best-installed roof has a shelf life. Once a roof reaches 15–20 years, materials begin to degrade, seams can separate, and coatings lose their waterproofing capabilities. Aging systems are more prone to leaks if not regularly maintained.

5. Poor Installation or Repairs

If a previous contractor didn’t follow best practices during installation or repair, the results could show up years later in the form of leaks. Improper seam welding, misaligned insulation, or missing flashing details are just a few examples.

Environmental Stressors in Santa Monica

Coastal properties like those in Santa Monica face unique environmental stressors:

• Salt in the air accelerates corrosion of metal components

• Sun and UV exposure weakens membranes faster

• Occasional heavy rains test the drainage system

These conditions make regular inspections and proactive care especially important.

What to Do If You Spot a Leak

If you notice water stains, bubbling paint, musty odors, or dripping during storms, act quickly:

• Document the damage

• Contain water using buckets or tarps

• Contact a professional roofing contractor immediately

Delaying action allows damage to spread and may compromise the building’s structure or lead to mold.

Get Expert Help from Local Professionals

For business owners in Santa Monica, working with a trusted local expert like Economy Roofing is the key to resolving leaks fast and correctly. Their trained crews inspect every inch of your roof to find the source of the problem and offer durable solutions backed by years of experience.

Backed by Trusted Brands

Economy Roofing is a certified Malarkey Emerald Pro Contractor and Owens Corning Preferred Contractor, which ensures access to high-performance roofing materials and extended warranties.

Read also our blog: Tips to Boost Your Commercial Roof’s Energy Efficiency

Knowing the common causes of commercial roof leaks helps you act quickly, minimize damage, and maintain a safe, dry environment for your business. Don’t wait for a small drip to become a big disaster—inspect, maintain, and stay prepared.