Roof blisters are one of the most common issues on commercial roofs.

Due to sudden temperature changes, roof blisters may pop up at any time.

You may initially think they are not dangerous and might not need immediate attention. 

However, when left unaddressed, they can almost certainly cause damage to the membrane.

Roof blisters are bags of air trapped between the underlying substrate and the topcoat membrane.

Single-ply membranes are the most affected.

But what causes roof blisters? Keep reading to learn more!

1. Poor Installation

Every roof blister starts with an improper installation of the roofing system.

The installed membrane should have complete adhesion to work efficiently.

The surface has to be clean, dry, and free of dirt, dust, or other contaminants to avoid gaps below the surface.

To discover the importance of roof preparation, click here.

2. Moisture

They usually start as small voids within the system, but they will grow bigger due to extreme temperatures and natural elements.

In addition, during the rainy season, water, vapor, and other gases can filter through the surface, causing noticeable moisture that can later cause them.

In rare cases, roof blisters can last for the whole roof’s lifespan without necessarily causing leaks.

To discover the most common causes of roof leaks, click here.

What Causes Roof Blisters?

Regular inspections and a maintenance program can help you identify roof blisters in time.

3. Thermal Contraction and Expansion

Many roofing materials will stretch under weather temperatures.

Hot weather will cause the surface to expand during the day, and a cold front will cause contractions at night.

Your roofing contractor has to ensure there’s proper ventilation, whether they’re installing a new roof or taking care of the blisters.

Do not forget to include regular inspections!

Your commercial roofing system is essential to your building’s structure and daily activities.

Regular inspections and a maintenance program can help you identify roof damages in time.

At Instacoat Premium Products, we are experts in commercial roof restoration systems.

Contact us today!