Mastic asphalt: evolving to meet the needs of modern construction

Mastic asphalt is often associated with flat roofing applications but due to its waterproofing properties, durability and versatility, it is being specified across a whole range of modern construction applications.

Suitable for new-build and refurbishment projects

Although mastic asphalt is commonly used for refurbishment projects, it is increasingly being specified for new-build roofing, especially when life cycle costs are considered. 

When compared with alternative waterproofing systems, mastic asphalt can offer the lowest life cycle costs over a 60-year period. Added to this, the Mastic Asphalt Council (MAC) has many examples where mastic asphalt has lasted well over 100 years.

Mastic asphalt can be applied to most substrates, including concrete, metal, timber and plywood decks. It forms a continuous waterproof covering over flat, sloped or curved surfaces in warm, cold and buried roof applications and can be moulded around pipes, rooflights and other projections to provide a completely seamless membrane. It’s also manufactured in the UK.

Recyclable and carbon-neutral

Mastic asphalt is well known for being durable and long-lasting, but what is perhaps less well known is that it is one of the most sustainable and green building materials currently available – with zero waste. Mastic asphalt is carbon neutral and when it has reached the end of its useful life, it can be recycled or used as roof screed. 

Well over 10  years ago, the mastic asphalt sector became the first industry in the world to achieve the CarbonZero standard, with every tonne of mastic asphalt produced being offset to support worthwhile community causes around the world.

More specifiers are choosing mastic asphalt for green roof applications – from schools to hospitals, office buildings to apartment blocks. It is critical that green roofs are build on a solid waterproofing foundation, and a green roof laid with mastic asphalt enhances the environment, controls storm water run-off and reduces noise and heat transmission. It also eliminates the need for root barriers.

Fire safety

Fire safety is a major consideration and mastic asphalt meets all relevant fire standards. As it is laid in molten form, mastic asphalt can be confused with other types of waterproofing membranes that require naked flame or torch on application. In reality, there is no naked flame at the point of installation.

The high mineral content of mastic asphalt means it fulfils all the external fire resistance required for a roof covering and achieves the highest rating (AA) when tested in accordance with BS476 part 3:1975. In addition, mastic asphalt flat roof waterproofing systems from the leading UK manufacturers achieve Fire Classification Broof(t4) in accordance with EN13501-6.

To find out more about mastic asphalt, visit masticasphaltcouncil.co.uk/it-all-stacks-up where you’ll find a wealth of information, including technical guides, case studies and our latest ‘Future Proof’ magazine. MAC also offers a free technical information service at Tel: 01273 242778 or email: info@masticasphaltcouncil.co.uk