If you’ve noticed bubbles forming on your foam roof, you’re not alone. This is one of the most common issues homeowners with spray foam roofing systems experience here in Phoenix.
Many people call them “foam roof bubbles,” while roofing professionals often refer to them as “foam roof blisters.” Either way, these raised areas on the roof can be an early warning sign that your roof needs attention before leaks and more expensive damage develop.
At Durafoam Roofing, we inspect foam roofs across the Phoenix area every week, and roof bubbles are something we see often — especially on older roofs exposed to years of Arizona heat and UV exposure.
What Are Foam Roof Bubbles?
Foam roof bubbles, or blisters, are raised sections that form underneath the coating or foam layer of a spray polyurethane foam (SPF) roofing system.
They can vary in size from small soft spots to large raised areas that feel hollow underneath. Some remain stable for years, while others eventually crack open and allow water intrusion.
In many cases, homeowners first notice them after:
- Heavy monsoon rains
- Intense summer heat
- A roof inspection
- Seeing cracking around the bubble itself
Why Do Foam Roof Bubbles Form?
There are several possible causes of foam roof blisters and bubbles.
Trapped Moisture
One of the most common causes is moisture trapped beneath the coating or foam system. As temperatures rise in Phoenix, heat can cause moisture vapor to expand, creating pressure underneath the roof surface.
Aging Roof Coatings
Over time, foam roofing systems naturally expand and contract from constant UV exposure and extreme temperature swings. Older coatings can lose elasticity and begin separating from the foam underneath.
Poor Adhesion
If a roof was not properly prepared before recoating, sections of the coating may not fully bond to the surface. This can eventually create separation and blistering.
Arizona Heat
Phoenix heat is brutal on roofing systems. Constant thermal movement can accelerate blister formation, especially on older roofs that haven’t been maintained or recoated on schedule.
Are Foam Roof Bubbles Dangerous?
Not every foam roof bubble means your roof is failing.
Small stable blisters that are not cracked or taking on water may simply need monitoring during routine roof inspections.
However, larger expanding bubbles can become a serious issue if ignored.
As the blister grows, the outer coating may weaken and eventually split open. Once that happens, water can enter the roofing system and lead to:
- Roof leaks
- Foam deterioration
- Interior ceiling damage
- Expensive repairs
- Premature roof replacement
This is why early inspection matters.
Should You Pop a Foam Roof Bubble?
Usually, no.
Many homeowners assume they should cut open or puncture the bubble themselves, but improper repairs often make the problem worse.
Opening a blister incorrectly can:
- Damage surrounding roofing material
- Create immediate leak paths
- Trap additional moisture
- Void roof warranties
- Lead to larger repair areas later
A professional inspection helps determine whether the blister should:
- Be monitored
- Be repaired locally
- Be removed and patched
- Or indicate larger roofing failure
How Professionals Repair Foam Roof Blisters
The repair process depends on the size, condition, and moisture level inside the blister.
Typical foam roof blister repairs may involve:
- Cutting and removing damaged material
- Allowing trapped moisture to dry
- Rebuilding damaged foam sections
- Applying new protective coating
- Sealing and reinforcing the repair area
In some cases, widespread blistering may indicate the roof is due for a full recoating or replacement instead of spot repairs.
Video: Foam Roof Bubbles Explained
How To Prevent Foam Roof Bubbles
The best way to prevent blistering problems is routine maintenance and inspections.
We recommend:
- Regular roof inspections
- Keeping drains clear
- Repairing coating damage early
- Recoating the roof before severe deterioration occurs
- Addressing ponding water quickly
Foam roofs can last a very long time in Arizona when properly maintained.
Signs Your Foam Roof Needs Inspection
You should schedule a roof inspection if you notice:
- Raised bubbles or blisters
- Cracking roof coating
- Soft or spongy areas
- Ponding water
- Interior ceiling stains
- Recent storm damage
- Coating peeling or separation
Foam Roof Repair in Phoenix
At Durafoam Roofing, we’ve specialized in foam roofing systems in the Phoenix area since 1989.
We provide:
- Foam roof inspections
- Foam roof repair
- Roof recoating
- Leak detection
- Flat roof maintenance
- Residential and commercial roofing services
We proudly serve:
Phoenix, Scottsdale, Paradise Valley, Glendale, Peoria, Mesa, Cave Creek, Carefree, and surrounding Arizona communities.
What causes bubbles on a foam roof?
Foam roof bubbles are commonly caused by trapped moisture, aging coatings, poor adhesion, or thermal expansion from Arizona heat.
Are foam roof bubbles normal?
Small blisters can occur over time on aging foam roofs, but expanding or cracked bubbles should be inspected professionally.
What is a foam roof blister?
A foam roof blister is a raised area where the roofing material or coating has separated from the surface underneath.
Can foam roof bubbles cause leaks?
Yes. If a blister cracks open, water can enter the roofing system and eventually lead to roof leaks and structural damage.
Should I pop a bubble on my foam roof?
Generally no. Improperly opening a blister can worsen damage and create new leak paths.
Can a foam roof with blisters be repaired?
In many cases, yes. Localized blister repairs are common when caught early.
How long do foam roofs last in Phoenix?
With proper maintenance and recoating, foam roofs can often last decades in Arizona’s climate.
Schedule a Foam Roof Inspection
If you’re seeing bubbles forming on your foam roof, it’s better to inspect the issue early before monsoon storms and extreme heat make the problem worse.
Learn more at:
Durafoam Roofing
