Bitumenbased Systems

Most bitumen systems require a primer to seal the existing roof membrane and provide a base for the liquid coating. Two or three coats of bitumen solution or emulsion will normally be required for the waterproofing layer, and a solar reflective finish should be applied after the membrane has fully dried. A layer of glass-fibre reinforcement is usually incorporated during application of the waterproofing membrane to give dimensional stability. Two-component systems mixed during the spraying process cure more rapidly, allowing a seamless 4 mm elastomeric coat to be built up in one layer on either flat or pitched roofs. Where the material is ultraviolet light-resistant, a solar reflective layer may not be necessary.

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