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Nuratherm PIR System

A high-performance polyisocyanurate insulation board that offers strong thermal resistance for lightweight roof assemblies.

1

High R-value per mm ensures efficient thermal performance with a thinner profile.

2

Compatible with Nuratherm warm roof systems using Nuraply 3PM or Nuraply TPO.

3

Closed-cell polyisocyanurate foam resists moisture absorption for long-term reliability.

Nuratherm Warm Roof Installed
Enertherm PIR Insulation Render

Introduction

The Nuratherm systems uses Enertherm PIR insulation, a rigid, high-performance board designed to deliver maximum thermal resistance with minimal thickness. It is widely used in warm roof systems throughout New Zealand, often specified in projects where both energy efficiency and aesthetics are paramount. 


Enertherm PIR sits above the vapour barrier and beneath the waterproofing membrane, maintaining continuous insulation across the roof and eliminating thermal bridging. It’s compatible with Nuraply membranes and offers high compressive strength and long-term dimensional stability. 


The ALU foil facer is conductive. This means that, in a first for New Zealand, all Nuratherm PIR installations are able to be installed ready for Electronic Leak Detection. 


Enertherm PIR has been used on hundreds of successful projects, supported by CodeMark certification and comprehensive technical guidance. It’s a smart choice for specifiers seeking performance, reliability, and compliance in warm roof construction.


More information about Enertherm PIR Systems is available from Outright Insulation at outright.co.nz

Considerations

  • Not suitable for inverted roof applications: Enertherm PIR must be used above a vapour barrier and below the membrane — for an inverted roof choose Nuratherm XPS Combi.


  • Requires a flat, stable substrate: Uneven or unstable surfaces can lead to deflection. Brick bond the sheets to create a tight installation pattern


  • Thermal bridging risk at fixings: Mechanical fixings can compromise insulation continuity. Use thermally broken flanges wherever possible to minimise energy loss.

Enertherm roof lay

Technical Documents

For all the Technical Documents you require.

Enertherm roof lay

Product Brochure

More information for download

Installation Details

A comprehensive set of Installation Details is available

FAQs

What is Enertherm PIR and how is it used in warm roof systems?
Enertherm PIR is a rigid polyisocyanurate insulation board used to provide continuous thermal insulation in warm roof systems. Positioned above the vapour barrier and below the waterproofing membrane, it significantly reduces heat loss and eliminates thermal bridging. This high-performance board is lightweight and engineered to meet NZBC H1 energy efficiency requirements, making it a cornerstone of sustainable, warm roof assemblies.
What R-value does Enertherm PIR provide for flat roofs?
Enertherm PIR offers an impressive R-value per millimetre, typically providing around R4.6 at 100mm thickness. This high thermal resistance enables designers to achieve energy-efficient roof builds without excessive insulation depths, ensuring compliance with NZ H1 standards while optimising space and performance.
How does Electronic Leak Detection work?
Electronic leak detection (ELD) works by applying an electrical current to a roof surface and identifying breaches where water can conduct the current through the waterproofing membrane. Using either low-voltage (wet) or high-voltage (dry) methods, it accurately pinpoints even tiny leaks without damaging the membrane. By taping the Enertherm boards together with special conductive tape, we create a platform under the membrane to perform the tests.

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Related Webinars

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Fire Safety and Insulation Standards in Membrane Roofing Systems

Discussing fire safety testing and standards for insulation in roofing.

Presented by Shane Clarke (Nuralite), Scott Squire (Nuralite), Christoph Desmet and Bart Claesswinnen (IKO).

Modern multi-story building with large windows and a rounded corner, situated at a street intersection on a sunny day.

Substrate Roofing Solutions: Balancing Cost and Quality

Discussing the practical insights and benefits of various roofing substrates.

Presented by Shane Clarke & Benedicte Pacorel (Nuralite) & Micah Hoskin (Complete Waterproofing).

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