Leadax – Circular building materials out of PVB-waste

Leadax uses high-tech material & production knowledge for developing and manufacturing 100% circular materials out of waste for waterproofing buildings, such as flat roofing, flashing or waterproofing basements. Leadax is already operating on a global scale and is ready for upscaling to accelerate impact.

The materials are made of discarded PVB (polyvinyl butyral), a plastic foil that is used in laminated glass (e.g. car windows or safety glass). Leadax designed the materials in such a way that at the end of their lifecycle, they can be easily dismantled, recycled and used again as raw material.


"With every Leadax flat roof of 750 m2 (25 x 30m) we eliminate the CO2 footprint of one European."

Roeland van Delden, CEO Leadax

Successful upscaling

In 2015 Leadax identified recycled PVB as raw material for producing building materials. After two years of extensive research and development, it was ready to enter the market. Fossil fuels are running out so Leadax wanted to create materials with a future. The cost price of Leadax is competitive without a compromise to quality since it uses waste as raw material.

The company has won awards (e.g. Circular Ondernemen Award 2019 and Nederland Innovation Award 2019) and is busy with upscaling on several ways: Upscaling sales and marketing in the existing fifteen countries – Upscaling with new markets – Upscaling with R&D for new products out of the PVB-waste – Building a global brand.