Made up of a mixture of asphaltic cement which consists of bitumen asphalt or lake asphalt, polymers, crushed limestone, crushed coarse aggregate, pigments, binders, modifiers and special aggregates. It can easily be worked around pipes, roof lights, and other projections, where the craft skills of a mastic asphalt spreader make use of the flowing characteristics of the material to guide it around penetrations and along upstands. Flexiphalte can be delivered in block form for melting on site or alternatively where fast track installation is required, it can be delivered from the factory to the site by ‘hot charge’ for instant installation.
Only a certified, trained operative can install mastic asphalt. In a typical car park specification the product is applied with a wooden float to a depth of 20mm two 10mm passes for the waterproofing and up to 38mm for the wearing course that is applied again by hand in one cost. The surface is then sand rubbed and crimped or has specially developed pre-coated chippings The product is dense without voids, and cannot be compacted, and when laid produces a monolithic membrane with sufficient flexibility to cope with the normal movement of a well-designed structure.
The surface is sufficiently durable to accept traffic and limited concentrated loads as soon as it has cooled to ambient temperatures.