Systems in use
One significant challenge for this project was that the roof did not comply with current Part L building regulations and needed thermally upgrading as part of the building refurbishment works. There were also combustibility issues with the metal cladding to the perimeter of the flat roof area. Not only this, severe ponding water and delamination of the existing membrane meant poor drainage falls across the roof area.
Access was also a challenge for this survey, with a scaffold having to be erected before the final roof condition report could be conducted, so time and turnaround was key to lessening additional costs for the building owner. Axter were able to conduct the survey and get recommendations and specifications to the main contractor and client within a 48 hour window, allowing the scaffold to remain in situ in preparation for works to commence as soon as possible.
As the existing waterproofing was beyond repair, we recommended that it be completely stripped back to the metal substrate. In its place, the Force reinforced bitumen system was installed, which was idea due to its durability, flexibility and exceptional ageing characteristics.
The system incorporated Hytherm ADH Tapered Insulation following on from a level survey to improve falls and upgrade the thermal performance of the building in line with current regulations.
Axter’s Starcoat R cold liquid bitumen PU resin was employed to mitigate any potential fire risk to details, in line with the NFRC’s Safe2Torch guidance. A charcoal granule finish was added to this in order to maintain continuity of the RBM membrane aesthetic.