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Research shows that damp, mouldy, poorly ventilated homes affect the respiratory health of many New Zealanders.

To help address these issues, MBIE has introduced the new 5th edition of H1/AS1 and H1/VM1 for housing and H1/AS2 or H1/VM2 for buildings greater than 300 m². This means significantly more insulation will be needed in the ceiling, walls and floors of new buildings from 1 May 2023.

Learn more about the H1 Building Code changes below or download our H1 FAQs.

What's New

Why is notching recommended

Why two layers of R3.6 is not recommended

How to avoid an unnecessary raised heel truss

Design Navigator and the BRANZ Home Insulation Guide

Edge Compression R-value Calculator

Comfortech® have worked with Design Navigator to develop an Edge Compression R-Value Calculator. This calculator allows us to extrapolate the product R-value across the last 500mm of the ceiling or roof perimeter, under compression to ensure you will meet the required R3.3 construction R-value under the 5th Edition of H1.

View Calculator

Introducing our new product range, Pink® Superbatts® insulation.

Specifically designed to meet the H1 Building Code changes, our Pink® Superbatts® are extra wide to bridge thermal gaps and maximise thermal performance.

Learn more

Frequently Asked Questions - H1 Changes