PVC Membrane on Existing Bituminous Roof

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Your factory or warehouse roof may already have a bituminous waterproofing system. It may have served its purpose for years, gradually deteriorated, and undergone multiple repairs along the way.

The problem rarely starts from a single point. Openings at seams, embrittlement caused by prolonged UV exposure, and an increasing number of localized repairs are often signs that the system is approaching the end of its service life. At this stage, the real question is: continue repairing it, or secure the building with a long-term solution?

When properly designed, installing a PVC membrane over an existing bituminous roof provides the opportunity to renovate the roofing system without complete removal while delivering long-term protection.

Risks That Develop Over Time on Bituminous Roofs

Bitumen-based roofing systems may gradually lose performance over the years.

What Does Renovation with PVC Membrane Provide?

PVC membrane systems can be installed over existing bituminous roofs when proper separation layers and detailing strategies are incorporated.

This approach eliminates the cycle of temporary repairs and delivers a planned, long-term roof renovation.

How Is the Application Process Planned?

Installing a PVC membrane over an existing bituminous roof involves far more than simply laying a new membrane.

Without proper planning, combining two roofing systems does not necessarily create a solution.

We begin every project with a technical assessment and ensure compatibility between the existing and new systems.

Why Should You Make the Decision Now?

Bituminous roofs are often postponed with the mindset that they can last “one more season.” However, every delay can lead to:

• Increasing maintenance requirements
• Unexpected leakage risks
• Costs associated with operational downtime

A planned renovation is always more economical than dealing with uncontrolled damage.

5-Year Warranty Protection

Installing a PVC membrane over an existing bituminous roof requires experience. Layer compatibility, fastening design, and detailing solutions demand careful attention. All applications are performed by our own installation teams. The warranty we provide is backed by disciplined on-site execution and quality control.

Technical Assessment and Proposal

Let us evaluate the current condition of your roof on site. We will determine whether the existing bituminous layer can remain in place and present the most suitable renovation strategy in a clear and practical manner.

Consider installing a PVC membrane over your existing bituminous roof not as an expense, but as an investment in the long-term protection of your facility.

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