The old roofing system (asphalt-gravel) was 25 years old when it was first repaired in 1999, that is to say when it was replaced by the new system (SBS membrane). Although the lifespan of the materials that were to be replaced generally varies from 25 to 30 years, the developer decided to be proactive and perform the first resurfacing after 20 years in 2019.
Compared to a complete repair, the first resurfacing extended the life of the cap sheet membrane installed over the existing waterproofing by at least 25 years. In doing so, there was therefore no need to replace the roofing system’s underlayments, namely the vapour barrier, insulation, support panel and two-ply system.
As part of this project, two other resurfacings would be possible in the future. These potential works would extend the life of the existing system by 50 years. Considering that it is already 20 years old and another 25 years was added with the first resurfacing in 2019, this would mean that the roof system could reach a lifespan of 95 years*.
One of the solutions is resurfacing, and this solution has been offered by SOPREMA for more than 20 years.