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Roof Membranes

Construction Products


Next to cold and warm roofs, allnex also provides fully reinforced modified bituminous waterproofing systems for inverted roof membrane assemblies with ballast on top.

This system uses Extruded Polystyrene thermal insulation (XPS) and can be covered by a ballast of pebble stones or concrete pavers on supports.


Cold Roof

For over 25 years, allnex has been waterproofing some of New Zealand's most iconic projects together with our long-term partner Soprema.

Soprema are the global leaders in modified bitumen membranes.  The Soprema group has currently more than 65 factories around the world and offers a wide variety of waterproofing membranes manufactured with SBS and APP modified bitumen technology.

Waterproofing buildings with SBS and APP modified bitumen membranes is a proven technology.  Our systems provide the utmost in durability and reliability ensuring watertight structures and peace of mind.

Soprema has been developing its bitumen technology for more than 100 years.  Their formulas and manufacturing process of SBS and APP modified bitumen membranes have been time-tested all over the world.

Our range of SBS and APP modified bitumen membranes can be applied using a variety of installation methods allowing our certified contactors and project/facility managers the flexibility to complete the job in any climate.

Green Roof - Cold

allnex is your partner to create a living green roof.

Check our APP and SBS modified, root-resistant Soprema waterproofing systems for extensive, semi-intensive and intensive green roof applications.

Green Roof - Warm

For our warm green roofs we combine our energy-efficient warm roof thermal insulation system with either a Soprema APP or SBS based root-resistant waterproofing membrane to give you the perfect solution for a fully insulated warm green roof.

Roofing Underlayments

Premium performance underlayment, protecting roofs since 1978.

For architects and roofing contractors, roofs are a source of everlasting concern.  70% of all construction litigation is related to leaks, and every leak is a lost opportunity, representing a cost to repair and a corresponding loss of customer trust. Severe weather seems to be the new normal and the risk of damage from ice dams and wind-driven rain are higher than ever.  Underlayments are the last line of defense in a roofing system, and selection of high quality underlayments can be the difference between success and failure.

Protecting the roofs of over 2 million homes, and installed on marquee projects in 25 countries since its introduction in 1978, these high performance solutions provide superior performance and excellent value.

Outperforming the competition, letting contractors shine and keeping families safe and dry.

Single Ply Membrane

  • Soprema Flagon PVC

Soprema Flagon PVC membrane range represents an industry leading range of synthetic waterproofing membranes. Flagon product development is based on long-term experience and innovative manufacturing technologies.  Soprema's 

Flagon PVC membranes have a unique formulation, are light weight and fully recyclable at the end of their service life.

With a life expectancy of over 35 years, Soprema Flagon PVC membranes guarantee longevity and provide a long-term, aesthetical waterproofing protection to your property.

Warm Roof

Soprema's Xpress Iso is a composite insulation board combining a layer of mineral wool with a polyisocyanurate (PIR) insulation board and a modified bitumen base sheet. All layers are factory-laminated together and come as one layer.  PIR insulation, is already known for its thermal qualities, and when combined with mineral wool insulation, it gets even more effective and durable.  In addition, Xpress Iso significanlty reduces the application time on job sites.

Flexitherm is a graphite enhanced expanded polystyrene insulation which is locally manufactured.  Slopes can be created by cutting the insulation to falls making it easy to achieve the building code requiremens for slopes on a flat roof.

What's Your Challenge?

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We have the experience and knowledge to find the right solution for your application.

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allnex Product Highlights

Technical Information

Product Technical Data Sheets Specifications
Xpress Iso TDS Specification
Ice & Water Shield TDS Specification
Flexitherm TDS Specification
Sopralene Flam 180 TDS Specification
Sopralene Jardin TDS Specification
Soprasun 4 Garden TDS Specification
Soprasun System TDS Specification
Sopravap'r TDS Specification