The New Zealand Building Code has an increased focus on energy efficiency. The clause in the New Zealand Building Code known as 'H1' requires improved thermal insulation performance in house construction.
In 2006 DBH published a consultation document ('Energy efficiency of buildings: Consultation on energy efficiency revisions to the New Zealand Building Code and Compliance Documents')
In this 2006 document the DBH recommended the minimum standard for under-floor insulation to be set at R 1.9 for buildings with non-solid construction nationwide. This minimum standard was supported by EECA.
An R 1.9 minimum standard would place the majority of current products below the building code minimum. At that time the underfloor insulation market was dominated by Expol (0800 UNDERFLOOR) at R1.4 and Pink Batts Cosyfloor at R1.3. EECA were retrofitting the now discredited foil (R 0.7 - R1.1) in their Energywise programs. Poly Palace were one of the only manufacturers with an under-floor insulation product (Palace Planks) that exceeded R1.9 and are the only manufacturer focused on the majority of sales exceeding this quality 'better practice' standard.
The building industry feedback to the consultation process was that time was needed for better performing products to be developed and brought into widespread market acceptance before a minimum standard of R1.9 could be achieved.
Following the consultation process with the building industry the following under-floor insulation standards were set:
It is evident that to future proof YOUR home with underfloor insulation that will stand the test of time YOU should insulate YOUR floor with products that exceed the DBH R 1.9 recommendation as a minimum.