Mastic asphalt is a durable, waterproof material traditionally used in construction for a wide range of applications, from roofing to flooring and damp-proofing. Composed primarily of bitumen and limestone aggregate, it forms a dense, seamless layer when applied. In domestic settings, mastic asphalt is valued for its longevity, strength, and resistance to weathering. Its versatility makes it particularly suitable for homes where robust protection against moisture ingress is required, such as basements, balconies, and flat roofs.

In residential buildings, mastic asphalt is most commonly used for flat roof waterproofing, but it also plays a significant role in damp-proof membranes, flooring in utility areas, and even in tanking for below-ground structures. The material provides an impermeable barrier that prevents water ingress, protecting structures from long-term moisture damage. In kitchens and bathrooms, its use under tiles ensures a moisture-resistant sub-base, which is especially important in high-humidity areas.