Poor Adhesion in TPO Roofing: Why Your TPO Membrane May Not Stay in Place
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When roofing contractors install TPO roof membrane the material is meant to stay in place for many years. The membrane sheets are adhered together at the seams to cover the entire roof in a single ply layer that's watertight.
But what if the sheets of membrane don't stay together?
Poor adhesion is a serious issue that compromises the integrity of TPO roofing. If the membrane isn't properly in place, it won't be water resistant. It can also lead to punctures and tears, lower the energy efficiency and reduce the lifespan of the roofing system.
Needless to say, poorly adhered TPO roofing is an issue that needs to be looked into as soon as possible. Failing to make the necessary roof repairs will only mean further damage down the road.
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What Causes Poor Adhesion in TPO Roofing Systems
From installation quality to UV radiation, here are some common reasons why you may run into adhesion issues with TPO roofs.
Seam Failures From Poor Installation
A proper installation process is key to avoiding adhesion issues. Unfortunately,
- Improper surface preparation
- Improper heat welding
- Using the wrong adhesives
- Uneven surfaces
- Dirty roof substrate
UV Degradation
Because of its reflective properties, TPO roofing offers superior resistance against UV damage. But prolonged exposure to UV rays can cause a lot of issues for any type of roofing, and with TPO materials adhesion problems are a possibility. Even a fully adhered system can run into problems over time.
Extreme Temperature Fluctuations
Thermal expansion from heat and contraction from the cold can cause a lot of movement on the roof. As the TPO membrane expands and contracts it can compromise the adhesion.
Chemical Exposure
Commercial buildings in some industries may be exposed to chemicals that break down TPO membranes.
High Foot Traffic
Walking around on the roof creates added stress that can damage the roofing materials, including the adhesion that's keeping seams together.
Ponding Water
TPO is often used on flat roof systems that can run into water ponding problems. Drainage has to be dialed in since the low pitch can keep water from running off. When water ponds on the surface it degrades TPO roofing materials and damages the seams. All it takes is 48 hours of ponding for adhesion problems to start.

Repairing and Preventing Adhesion Issues With TPO Roofing Systems
The fix for the TPO membrane is pretty clear in this situation - you have to re-adhere the seams that have come loose. Before you do that there are a few important steps to take to fully address the problem if the damage isn't too severe or widespread.
- Have the roof inspected by a roofer that knows the material – The inspection will identify areas with poor adhesion and determine what’s causing the TPO membrane to separate.
- Clean the roof – After locating the problem areas, thoroughly clean the roof surface. Any debris can compromise adhesion. Ensure the roof is completely dry before moving on, as adhesives will not bond properly to a damp surface.
- Repair spots where there's poor adhesion – Use a hot air welder to ensure proper adhesion in small areas so that the TPO sheets are installed correctly for long-term performance.
- Recoating to ensure better protection and performance – Once the TPO membrane has been re-adhered, apply a protective coating to enhance durability and overall performance.
When Replacement May Be Needed
The steps above can be used to repair small areas where the adhesion has been compromised and the damage is minor to moderate. In some cases complete roof replacement may be necessary, including when:
- There are adhesion issues across the entire roof.
- The seam separation is substantial.
- There is significant damage to the materials and insulation underneath.
A professional inspection is the first step in correcting TPO adhesion problems before they create more damage. Homeowners and commercial building owners in Central Texas can contact LOA at 512-375-3654 or reach out online to schedule a free, no-commitment roof inspection!