H1 Solutions

The H1 change which is to be implemented from 01 May 2023 requires the use of thicker insulation to help NZ homes and buildings to be warmer, drier and more energy efficient. However, as roof insulation increases in thickness and with warm moist air entering the roof space from the internal living area, there are greater risks of interstitial condensation in the roof structures if balance of heat, air and moisture movement is not considered in the roof designs. Poor moisture management can lead to failing to achieve a warm, dry, healthy home. It can also lead to deterioration of the building structure and other components as well as significant potential health risks for occupants.

DriSpace offers H1 ventilated roof system solutions by incorporating passive ventilation, high vapour permeable underlay, vapour control layers and airtight membranes to provide condensation control and air barrier solutions.


See below for the H1 Solutions.

Download our H1 Solution Systems


DriStud is a NZ brand of building products servicing both residential and commercial sectors. Products are engineered for NZ weather conditions and designed to be durable, highly functional and easy to install. The product range includes: wall wrap, window flashing tapes, synthetic roof underlays and foil insulation.

Vent NZ

VENT is the leading New Zealand specialist in the supply of passive ventilation systems and products. The products are structured and specifically tailored for NZ buildings and the extreme climatic conditions. VENT was created as a direct result of the misconception that the ‘Leaky Homes’ disaster that gripped New Zealand was caused solely by external moisture penetration and product failure.


Proctor products whose origin is from the UK since early 1900 specialise in manufacturing construction membranes. Proctor Group Australia has been servicing the Australian and New Zealand building and construction industry with an extensive portfolio of high-performance thermal and acoustic insulation, vapour control layers and self-adhering membranes.