“Specialist field: challenging roofs”
Joachim (left) and Johannes Hartmann
Project manager for roof waterproofing work on Rotterdam’s main train station
Was this home for bees your most unusual project so far?
It certainly was. We’ve covered, clad and sealed windmills, batwing and barrel dormers before, but this very special type of roof is definitely our most unusual.
What challenges did this construction project present?
Creating a technically perfect, safe and long-lasting roof including a living roof and doing it all with a roof shape that is certainly unique.
Why did you decide to use self-adhesive elastomer membrane when designing the roof sealing?
Given the inclination of the roof and its geometry, the excellent immediate adhesion of the roof membrane to the substrate was a great advantage, especially in the low temperatures that we experienced during installation. Virtually waste-free installation was also important, since the membrane can be welded together everywhere, not just in the seam areas. And not least, the membrane had to be laid quickly and easily.
The entire construction was carried out in accordance with building biology criteria using natural materials that were sourced primarily from the surrounding area. How do the roof membranes fit in?
The membrane we used is made from ecologically harmless materials: glass, EPDM, TPE and bitumen. The manufacturer’s products were certified with the IBU environmental product declaration and are listed accordingly with the DGNB. This convinced both me and the clients.
The clients are inspired by the design of their unusual construction project. Would you also include this property in the top ten of your list of references?