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Creative solutions for building rainwater management

How to decrease waste of polyvinyl butyral
Clean Water and Sanitation; Sustainable Cities and Communities; Climate Action
In progress

Current situation 

Using today's waste to prevent global waste forever: that is our mission. Our product range consists of several types of flashing (lead replacement) and flat roofing. The raw material of our products is recycled polyvinyl butyral (PVB), which was formerly used in safety glass, such as car windows. At the end of our products' lifecycle they can be recycled and reused as Leadax again. In short, we are closing the loop.

Leadax Flashing replaces toxic lead on roofs, which is unfortunately still being used in construction. Leadax Flashing Original even has the look and feel of traditional lead. Therefor we refer to our product as ‘the new lead’. Next to that, our second product is called Leadax Flashing Easy SA. Easy SA has two self-adhesive strips and is thinner than Leadax Flashing Original. The applications include chimneys, cavity walls and valleys, among others.

The challenge 

However, even when all the lead in the world would be replaced by Leadax Flashing, there still would be 95% of the PVB waste pile left, each year, in Europe alone. For this reason, we introduced Leadax PVB Roofing, a circular flat roofing product. Leadax PVB Roofing is the world’s most sustainable flat roofing and the next standard in roofing products, next to bitumen, TPO, PVC and EPDM. Our goal is to become the world’s standard in roofing products.

With our circular and sustainable waterproofing building materials we are on a mission to change the world for the better. We use waste as raw material, create affordable and scalable products, which can be recycled and reused as Leadax again at the end of their lifecycles.

Polyvinyl butyral (PVB) is the plastic foil between safety glass which could not be reused, until now. There is an abundance of PVB waste available worldwide. In Europe alone, this pile of waste weighs in at more than 1.5 billion kilograms (each year!). For comparison: This is the weight of 150 Eiffel towers.

We are looking for creative new ideas for innovative roofing systems solutions in cities. 

Expected impact

Reduction of environmental impact of specific building materials by the phasing out of toxic lead in buildings and the reduction of use of virgin PVB.

Target groups

Building companies, architects


Deadline for applications : 2021-02-14


Contact person
Marike Boertien
m.boertien@utwente.nl