This specification outlines the requirements for the materials, composition, and application of bitumen mastic used for the waterproofing of wet areas and drainage systems. It provides guidelines on aggregate grading, bitumen content, and laying procedures to ensure a durable, impermeable layer.
Specifies requirements for bitumen mastic used for waterproofing wet areas and sealing drainage systems in buildings.
Quick Reference Values
bitumen content by weight14 to 17 %
hardness number at 25C10 to 20
laying temperature180 to 200 °C
minimum thickness wet areas10 to 20 mm
primer application rate0.2 to 0.3 kg/sq.m
Practical Notes
Ensure the receiving surface is completely dry, clean, and primed before laying the mastic to ensure proper adhesion.
Strictly monitor the temperature in the mastic cooker; overheating can degrade the bitumen and reduce its waterproofing efficacy.
A protective screed or finishing layer is highly recommended over the mastic to prevent mechanical damage.