Mastic Asphalt Systems

A perfect impermeable mass.
Flame free, low risk application for
critical time constraints.

Mastic Asphalt (or Neuchatel as it is referred to in New Zealand) has been successfully used to provide unbeatable protection from water penetration for centuries. In recent years the material has been reformulated to include advanced polymers for increased durability, combining its traditional strengths with modern technology.

Not simply a roofing material, it is used in various applications, including walkways and roads. It is highly resistant to all types of weather situation and attacks from thermal shock (rapid temperature changes), which are a frequent source of break down in many other types of membrane. Its durability and seamless application means that it is one of the few membranes able to handle consistent heavy foot and vehicular traffic, including from Heavy Goods Vehicles, and still maintain its waterproof integrity. It is also easy to repair should alterations or damage occur.

Mastic Asphalt is produced by IKO to British standards and is manufactured to ISO 9000 Quality management system. Mastic Asphalt has a BBA certificate. IKO is a member of the Mastic Asphalt council of Britain and Europe.

Asphaltech Mastic Asphalt is New Zealand’s Code mark approved waterproofing product that can be laid to zero fall substrates.

Mastic Asphalt Product Composition

Mastic Asphalt Instructional Videos

Installing Mastic Asphalt, The Horizontal Surface

Installing Mastic Asphalt, The Vertical Surface

Specialist Detailing

Why choose Polymer Modified Mastic Asphalt?

  • Durability – With all the benefits of traditional mastic asphalt but with a greater flexibility of a modern polymer for a more robust and durable covering.
  • Resistance – A seamless joint free monolithic system with a high resistance to mechanical damage during the construction process
  • Lifespan – Correctly designed and installed will outlast any other system in the market.
  • Fire resistant – The high mineral content of mastic asphalt renders it virtually incombustible.
  • Guarantee – The system carries an unrivalled 20 year system warranty for both materials and workmanship
  • Accessories – A full range of accessories are included under our comprehensive guarantee which include outlets, vents flashings edge trims and decorative paint coverings

A dense mass, composed of suitably graded mineral matter – chippings, and/or sand, and or limestone fine aggregate and/or crushed natural limestone powder and bitumen (natural or issued from crude oil distillation). Mastic asphalt is non-toxic (water insoluble), reuseable ecological building material.

The Mastic Asphalt product comprises of suitably graded limestone aggregates bound together with asphalt cement (primarily refined bitumens), to produce a dense, void-less material. It cannot be compacted and is spread when hot by means of a hand float, rather than rolled.

Mastic Asphalt is an ideal material for a whole range of construction applications in both new-build and refurbishment where a smooth, seamless, durable surface is required. It offers total waterproofing integrity for roofing and tanking and acts as a tough working surface in flooring and paving.

2,350 kg/m3


4 / 6 x 10-5/°C

Coefficient of cubic expansion

0.5 W/mK

Thermal Conductivity
(Design Purpose Lambda Value)

100,000 MN8/(gm)

Control of water vapour -
Resistivity no less than

20,000 MN5/(gm)

Control of water vapour -
Condensation control

1,01 x 103 J/kg K

Specific heat value

7 dB (A) by 25 mm

Control of water vapour -
Resistivity no less than

1,013 Ohm/cm

Electric (antistatic)
conductivity resistance

Choose from one of our systems below

Flat Roof System

Mastic Asphalt is the ultimate flat roofing system and has been used extensively over hundreds of years. It has stood the test of time, protecting many of New Zealand’s most prestigious buildings.

Pacoflex Mastic Asphalt is recognized for its durability and effectiveness as a waterproofing system. It is suitable for potable water use and can be finished in a range of colours.

Car Park Trafficable System

The complete car parking system will not only waterproof your structure but can also be designed and laid with a Mastic Asphalt wearing layer or concrete wear slabs capable of withstanding high volumes traffic.

Car parking systems will require specific design depending on the nature and use of the car park in question. Systems vary from light traffic to extensive use.

Green Roof System

A superior green roof system for the environmentally conscious it is an ideal waterproofing material for extensive green roofs, intensive roof gardens and biodiversity roofs. It is completely resistant to root penetration and water collected off the Mastic surfaces is potable. It also increases the thermal characteristics, reduces noise transmission and increase the life expectancy of waterproofing membrane. By selecting our Green Roof system you have selected one of the greenest construction materials around.

Podium Terrace System

Extremely strong, durable and can be easily formed/molded to complex shapes the premium Podium system is perfect for modern construction.

In its malleable state, when hot, it allows a full range of surface finishes from the mastic asphalt wearing layer, which can be stamped with patterns, coloured or just smooth flat providing a stable base for overlaying various surface finishes from the pavers on pedestals systems to simple decorative pebbled surfaces.

Inverted Insulated Roof System

The inverted roof is a flat roof construction and its main feature is that, unlike in conventional flat roof designs, the thermal insulation is laid above the Polymer Modified Mastic Asphalt.

Any type of deck or ballast can be selected as a finishing surface such as gravelled or pebbled roofs, paved terrace roofs, green roofs.

Warm Roof Thermal Insulated System

The Warm Roof System includes a layer of high quality insulation foam between the roof structure and the Polymer Modified Mastic Asphalt layer. This will greatly increase the thermal properties of the roof structure. Very useful with today’s strict building code requirements.

Pacofoam is a high performance, fibre free, rigid thermoset insulation core faced on both sides with a low emissivity composite foil facing which is used for insulating flat roofs and is fully compatible with Pacoflex mastic asphalt systems.