Saw-tooth north light roof poses waterproofing problems for contractor
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industrial roof with eight 2m-high vertical faces.
The weatherproofing of the roof was originally designed to use three materials, but the construction company behind the project, Blenheim House Construction, identified the narrow gutter and complicated interfaces as an obstacle to weatherproofing. The system was subsequently changed to an all- Sarnafil roof.
The main challenge for Robseal Roofing was the absolute requirement to ensure watertightness
within a short time frame. Watertightness could not be fully achieved until the gutters were in place, and they are usually the last element to be installed.
The system used is 1000 Ecovap VCL, 95mm PIR SarnaTherm insulation, with fully bonded Sarnafil
G410-12ELF Lead Grey membrane on the slopes and verticals, and Sarnametal edge trims to all roof
edges. Tapered insulation was incorporated in all gutters to ensure efficient drainage. Water naturally falls to gutters and the only flat working area was in the gutters themselves, so spead of installation was key. Robseal had meetings to discuss the project with BHC and the architect Adjaye Associates to ensure design and build quality.