Benefits of Using PIR Insulation in Your Rainscreen

Here’s how PIR insulation contributes to the effectiveness of a rainscreen system:

Thermal Insulation Efficiency

High R-value: PIR insulation has a high R-value per inch, meaning it provides excellent thermal insulation while using less material. This minimises heat loss, improving the building’s energy efficiency and reducing heating and cooling costs.
Stable performance: PIR maintains its insulation performance over time, ensuring long-lasting thermal resistance and temperature regulation.

Moisture Resistance

Closed-cell structure: PIR has a closed-cell foam structure, which makes it highly resistant to water absorption. This helps prevent moisture ingress into the wall cavity, keeping the structure dry and reducing the risk of mould or water damage.
Vapour control: PIR boards often come with foil facings, which act as vapour barriers, controlling the movement of moisture and further improving the building envelope’s ability to manage condensation.

Lightweight and easy installation

Ease of handling: PIR is lightweight, making it easier to transport and install, especially in complex rainscreen systems.
Customisable sizes: PIR boards are available in various thicknesses and can be cut to fit different areas, reducing installation time and waste.

Fire performance

Fire resistance: PIR insulation often has good fire resistance properties. This enhances the overall fire safety of the rainscreen system, slowing the spread of fire and reducing the risk of structural damage.

Durability and Longevity

Resistant to degradation: PIR insulation is resistant to rot, pests, and environmental factors like UV exposure, making it a durable choice that maintains performance over the lifespan of the building.
Sustainability: The long-term thermal efficiency and reduced energy use contribute to the sustainability of the building.

Ultimately, by combining thermal efficiency, moisture control, fire resistance, and long-lasting performance, PIR insulation improves the overall effectiveness of rainscreen cladding systems, providing both energy savings and protection for the building structure.

CNZ PIR Insulation Board

CNZ Insulation

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Polyisocyanurate (PIR) is a closed-cell, rigid foam board insulation.

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CNZ PIR Insulation Board is versatile and can be used internally or externally as the insulation product for walls, ceilings, skillion roofs, underfloor, slab edge, insulated precast concrete, exterior insulation finish systems (EIFS), warm roofs, soffits, and anything else that requires thermal performance. It is suitable for use in new buildings, extensions, and renovations, delivering the highest thermal performance with some of the thinnest possible solutions.

The PIR core has a closed cell structure, making it highly resistant to water absorption, and suitable for use in damp environments. The Aluminium Foil Board has a higher vapour resistance due to its foil facing.

CNZ Insulation offer custom profile cut board for a range of applications such as slab edge, tapered board, roof corrugations, pipes, and amenity insulation. Additionally, they can laminate alternate custom surfaces to their board such as plasterboard or plywood. This can speed up the installation on site as well as servicing unique project requirements.

CNZ PIR Insulation Board is primarily used for thermal insulation and will greatly contribute to attaining H1 compliance, as it can be used within a cavity, in a ceiling, between rafters and floor joists, underfloor, as well as on the external envelope. Using CNZ PIR Insulation Board will also assist in increasing the R-values of floor slab insulation. The high R-values provided by CNZ PIR Insulation Board will allow building methods to remain the same without resorting to thicker wall assemblies to achieve compliance to the new H1 regulations.

CNZ PIR Insulation Board has excellent fire protection properties meeting Group 2 and Group 3 ratings. Additionally, it is tested to AS1366.2 and the closed cell structure PIR offers provides an extremely low moisture transmission rate of 10-15 g/m² — 24hr.

AS/NZS 4859.1 — Thermal conductivity tested using ASTM C518 test method.
AS 1366.2 — Rigid cellular plastics sheets for thermal insulation — Rigid cellular polyisocyanurate (RC/PIR).
AS 2498.3 — Methods of testing rigid cellular plastics Determination of compressive stress.
B2/AS1 — Durability, performance clauses B2.3.1(a) and B2.3.1(b).
C/AS1 — AS2 protection from fire.
E2/AS1 — External moisture.
E3/AS1 — Internal moisture, performance clause E3.3.1
F2/AS1 — Hazardous building materials.
H1/AS1 or VM1 — Energy efficiency for all housing & buildings up to 300m².
H1/AS2 or VM2 — Energy efficiency for all housing & buildings greater than 300m².
NZS 4246 — Energy efficiency: Installing bulk thermal insulation in residential building.

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