Naturally, the choice of roofing system had to comply with the overall sustainability goals of the project. Zeelenberg Architectuur prescribed the use of EPDM membranes for their superior durability of over 50 years. A vapor barrier membrane was installed over the wooden roof deck of the cottages, followed by PIR insulation boards. A total of 25,000 m² of 1.1 mm thick RubberGard EPDM membranes were fully adhered on top.
One of the main challenges was that the cottages were all slightly different, not only in terms of dimensions, but also featuring different roof details. Firestone Building Products’ roofing experts carried out a Bill of Quantities Calculation (BOQ) for the roof of every single cottage.
In order to further reduce installation time, the membranes were cut to measure offsite. In addition, thanks to the availability of RubberGard EPDM in large panels, the number of seams was greatly reduced, with most roofs installed with one single panel without any seams at all. The ease that the RubberGard EPDM system offers when sealing roof details such as ventilation pipes was also an important asset during installation.