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At CNZ Insulation, we are proud to offer a range of sizes from 20 mm up to 160mm PIR insulation boards – 20mm being the slimmest option in our PIR range.
Even at just 20 mm thick, PIR delivers a strong thermal performance, low water absorption, and excellent fire properties, making it a smart choice for situations where space is limited but insulation performance is still required.
Whether you are designing a rainscreen façade, insulating a tight roof cavity, or simply need a slimline solution for detailing, CNZ’s 20 mm PIR provides reliable performance without compromising on space.
MBIE (Ministry of Business, Innovation and Employment) sets the energy efficiency requirements for New Zealand buildings under Building Code Clause H1.
As of early 2026, the building sector is operating under recently updated compliance settings intended to improve clarity and flexibility.
Minimum construction R-values vary by building element and one of the six climate zones. For housing and small buildings (under 300m²), standard minimums generally include:
Roofs: Significantly higher requirements, often targeting R6.6 to achieve a 40% reduction in heating energy.
Walls: Updated to a universal minimum of R2.0 across all climate zones as of recent adjustments.
Windows & Doors: Higher thermal performance is required, with R-values typically around R0.46 to R0.50 depending on the specific zone.
Floors: Slab-on-ground and timber floor requirements have increased to reduce heat loss to the ground.
Following changes announced in July 2025 and finalized in early 2026, the "Schedule Method" has been removed as a standard compliance pathway to encourage more site-specific design.
The remaining pathways are:
Calculation Method: Allows designers to trade off higher insulation in one area for lower in another, provided the total building heat loss remains the same.
Modelling Method: Uses computer software to prove the building does not require more heating/cooling energy than a reference building.
■ Removal of Schedule Method: The "blunt instrument" of the schedule method was officially removed in 2025 to reduce upfront building costs and improve cost-effectiveness.
■ Measurement Changes: Roofs, walls, and floors are now measured using overall internal dimensions for consistency.
■ Transition Period: The updated Acceptable Solutions (H1/AS1, H1/AS2) and Verification Methods took effect in late 2025, with a 12-month transition period ending on November 26, 2026.
For detailed technical guidance, refer to the MBIE Building Performance H1 Information Hub or use the NZGBC H1 Calculator for residential projects.
We supply a diverse range of PIR foam core insulation, including standard boards at 2400 x 1200, Slab edge , Thermal Break ,Tapered Boards along with custom profiled boards enabling significantly more flexibility in building design.
CNZ Insulation panels are tested to AS1366.2/ASTM 2498.3 standards from the highest quality materials, using state of the art production equipment to rigorous quality control standards, ensuring long term reliability and service life.
CNZ Insulation board delivers the highest thermal performance allowing homes and buildings to achieve premium levels of energy efficiency and with some of the thinnest possible solutions.
CNZ Insulation
49 Hammersmith Drive, Wigram, Christchurch 8042
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