PVC-P for roofing: six reasons why more and more projects are choosing RENOLIT ALKORPLAN membranes
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For over four decades, RENOLIT ALKORPLAN membranes have been used in new-build and renovation projects around the world. Their development addresses a clear need within the sector: the provision of waterproofing systems that combine technical performance, ease of installation, durability and environmental responsibility.
Below, we examine the six key advantages that set RENOLIT ALKORPLAN membranes apart.
1. Competitiveness: less material, less weight and shorter installation times
RENOLIT ALKORPLAN membranes are single-ply systems. This feature represents a significant difference compared to multi-ply bituminous solutions.
A single 30 m² roll of RENOLIT ALKORPLAN membrane can replace six rolls of two-ply bituminous waterproofing. This simplifies on-site logistics, reduces material handling and shortens construction times.
Weight reduction is another key factor. RENOLIT ALKORPLAN membranes weigh between 1.52 and 1.97 kg/m², making them more than four times lighter than many traditional multi-layer solutions. This lightness can help reduce loads on the structure and facilitates renovation work.
Furthermore, routine maintenance is generally limited to periodic visual inspections and the cleaning of gutters and drains.
2. Aesthetics: the fifth façade matters too
The roof is no longer merely a functional element but has become a visible part of the architecture.
RENOLIT ALKORPLAN offers a wide range of colours, allowing the roof to blend visually with the building’s surroundings or to emphasise specific design choices.
Another distinguishing feature is the discreet nature of the welds. The membrane overlaps are particularly discreet, creating a homogeneous and uniform surface that is often highly valued by architects, designers and property owners.
Furthermore, the material’s flexibility allows it to adapt to roofs with complex geometries and unique architectural projects.
3. Fire safety during installation
RENOLIT ALKORPLAN membranes are installed using hot-air welding.
This means that no open flame is required during the waterproofing process.
The absence of an open flame eliminates one of the most significant risks associated with certain roof works and is particularly advantageous in renovation projects where the building remains in use during the works.
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4. Physical properties tailored to the actual behaviour of buildings
Buildings are constantly subjected to movements caused by wind loads, snow loads or temperature variations.
RENOLIT ALKORPLAN membranes stand out for their flexibility and ability to absorb deformation.
The range used for expansion joints can withstand unilateral elongation of up to 360% of its original size, allowing it to follow the movements of the structure without compromising watertightness.
Added to this is high puncture resistance and water vapour permeability, which enhances the overall performance of the roof.
5. Proven durability
Durability is one of the main criteria for selecting a waterproofing system.
RENOLIT ALKORPLAN membranes have been on the market since the 1970s and their long-term performance has been extensively proven in numerous buildings.
According to an assessment carried out by the British Board of Agrément (BBA), the service life of RENOLIT ALKORPLAN F membranes can exceed 40 years when properly maintained.
This longevity allows for maximising the return on investment in the roof and reducing the need for future interventions.
6. Recyclability and environmental commitment
Sustainability is an integral part of RENOLIT’s development strategy.
PVC membranes can be recycled and reused as raw material in new manufacturing processes.
For this reason, RENOLIT’s roofing division participates in the ROOFCOLLECT® programme, an initiative aimed at the collection and recycling of synthetic membranes at the end of their service life.
The ability to recycle the material helps to conserve natural resources and promotes more responsible management of construction waste.
Conclusion
Competitiveness, aesthetics, safety, physical properties, durability and recyclability are the six pillars underpinning the RENOLIT ALKORPLAN value proposition.
More than just a waterproofing solution, it is a system designed to meet today’s construction requirements, in both new builds and refurbishments.
