Summer heat can be one of the most destructive and underestimated forces acting on your commercial roof.

Here’s exactly what to do before temperatures soar to protect your building, your tenants, and your bottom line.

Why Summer Heat Is a Threat to Commercial Roofs

When most property managers and building owners think about roof damage, they picture storms, ice, and heavy snow. But summer heat can be just as damaging, and is far more consistent in its destruction.

Commercial roofs, particularly flat and low-slope, absorb enormous amounts of solar radiation throughout the summer months. A dark commercial rooftop can reach 150°F to 190°F (or even hotter) on a hot summer day, even when the ambient air temperature is only in the 90s. That kind of sustained thermal stress causes roofing membranes to expand, contract, crack, blister, and degrade at an accelerated rate.

Add in UV radiation, thermal shock (rapid cooling from afternoon thunderstorms), and the weight of rooftop HVAC units working overtime, and you have a system under serious seasonal pressure.

The good news: most summer roof damage is preventable.

With the right preparation steps in late spring, you can head into the hottest months with confidence that your commercial roof is ready to perform.

Common Ways Summer Heat Damages Commercial Roofs

Before diving into preparation steps, it’s worth understanding exactly what heat does to commercial roofing systems.

Thermal Expansion and Contraction

Commercial roofing materials expand when heated and contract when they cool. Over years of summer heat cycles, this repeated movement stresses seams, fasteners, and membrane edges. This can eventually cause major issues like separations, splits, and water infiltration.

UV Degradation

Ultraviolet radiation breaks down the chemical bonds in roofing systems. Over time, this causes membranes to become brittle, lose flexibility, and crack under foot traffic or thermal movement.

Blistering and Bubbling

When moisture gets trapped under a roofing system and is then heated, it turns into vapor and creates pressure. This pressure forms blisters or bubbles on the membrane’s surface. Then, these blisters can weaken the membrane and, if punctured, become immediate leak points.

Ponding Water Acceleration

Flat commercial roofs are already prone to ponding water and often have areas where water collects and sits for 48 hours or more after rain. The summer heat accelerates the damage of this ponding water because of rapid evaporation and redeposition, which concentrates minerals and debris and degrades surfaces faster.

How to Prepare Your Roof for Summer Heat

There are two main things you can do to help prepare your roof for summer heat. They are scheduling a professional spring roof inspection and addressing any concerns that appear in that inspection.

Schedule a Professional Spring Roof Inspection

Everything starts here. Before you can prepare your commercial roof for summer, you need an accurate picture of its current condition. A professional spring inspection will identify:

• Membrane damage, open seams, and blistering from winter stress
• Flashing failures around HVAC curbs, drains, parapets, and penetrations
• Ponding water areas and compromised drainage
• Structural concerns with the roof deck
• Any damage from winter ice, snow loads, or storms

Trying to prepare a roof for summer without first assessing its condition is like tuning up a car without checking under the hood. A professional inspection, ideally by a trusted contractor with specialized commercial roofing experience, is the essential foundation of any summer preparation plan.

Address Any Concerns in Your Inspection

Once you’ve had a trusted contractor with roofing expertise inspect your commercial roof, it’s important to address any concerns. While it may seem like an easy option to wait, this could result in more costly issues later on or the inability to restore your existing roof.

If you have questions about what needs to be addressed and what can wait without putting your roof at risk, you can always consult with your trusted roofing partner.

Frequently Asked Questions About Commercial Roofs and Summer Heat

How can I tell if my commercial roof is failing from heat damage?

Signs include visible blistering or bubbling of the system, separated seams, cracked or shrinking sealants, increased interior temperatures, higher energy bills, and water stains inside the building.

Does a roof coating really reduce energy bills?

Yes. Our team has helped customers reduce on-site utility bills by up to 7%, simply because we restored their roof with a fluid-applied roofing system.

How often should a commercial roof be inspected?

Industry best practice is twice annually, with additional inspections after severe weather events. Most commercial roofing warranties also require documented annual inspections.

Want to work with a fluid-applied roof restoration specialist?

Our team of roof restoration and fluid-applied roofing system specialists partner with customers nationwide to provide high-performing roofing solutions.

Simply call us at 937.909.9030 or contact us via email. You can also follow us on LinkedIn and Facebook to learn more about us and our work.