C9.1.8 adhesive elastic bitumen rolls of 1.5mm thickness.

Supply and apply a waterproof and humidity / damp proof layer to be applied the concrete roofs.
It is to consist of a cold applied bitumen (solvent bitumen) base coat, and a sheet of self adhesive elastic bitumen rolls of 1.5mm thickness.
Including the overlapping and the welding and treatment at the joints as per the manufacturer's recommendations.