Inverted Insulated Roof
Inverted roof construction XPS A CFC/HCFC free extruded polystyrene insulation, for use above Neuchatel Mastic Asphalt in all inverted roof specifications. XPS is resistant to water and will provide long term protection to the Neuchatel Mastic Asphalt waterproofing system.
- 40mm Paver or tile on a tile jack
- Geotextile sheet
- Extruded polystyrene Insulation
- Neuchatel Mastic Asphalt
- Separation layer
- Concrete deck

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.
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.
- Protects and insulates the roof structure
- Monolithic, an aesthetic seamless finish
- Unbonded, allowing movement between structure and materials
- Can be laid at falls lower than 1.80
- A properly designed & installed mastic asphalt system will last 60 years
- Traditional mastic asphalt but with added polymers to improve flexibility & durability
- With 20 years warranty for supply and installation
- All in accordance with ISO 9001:2008

Mastic Asphalt Systems
Inverted Insulated Roof System
Neuchatel Mastic Asphalt Inverted Insulated Roof X-sectional Detail
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, as a result the dew point is taken outside the building, eliminating any possible condensation forming inside the roof structure. Any type of deck or ballast can be selected as a finishing surface such as gravelled or pebbled roofs, paved terrace roofs, green roofs or a combination including planters.
U-value guidance
Technical information and design can be arranged to suit your needs.