SupaWall Blow-in insulation - FAQs

Installing insulation into existing walls of homes - your questions answered.

Existing Homes - typical Questions

Research shows that 30% of heat loss occurs through your walls.  If you have already installed ceiling and underfloor – think of it like a tomato sandwich – the heat is going to squeeze right out the walls like a sliced tomato!

The glasswool insulation we use exclusively for our system is Supafil® Frame – made from recycled glass and sand.  In addition, the product is silicone treated to provide the required performance and enhanced durability.

Supafil® Frame is manufactured by Knauf Insulation – one of the world’s largest and leading insulation manufacturers.  Working with Knauf Insulation, we have been able to prepare comprehensive systems based on world-class processes, and applied specifically to New Zealand Conditions

Supafil® Frame is non-combustible

Yes, Supafil® Frame provides BOTH acoustic and Thermal performance.

Where installed, Supafil® Frame delivers high R-values in comparison to other exterior wall insulation types

R2.6 for standard 100mm (4 inch) timber frame and R3.6 for brick veneer.

Supafil® Frame is a dry glasswool, unlike other expanding foam type systems that is injected wet.  Also no risk of potential noxious fumes.

CodeMark and BRANZ

CodeMark is an unchallengeable form of product assurance.

Building consent authorities (BCAs, usually councils) must accept a product certificate as evidence of compliance with the Building Code.

BRANZ are an independent New Zealand based research organisation providing impartial evidence-based advice on critical issues in building and construction in New Zealand, to industry and government.

They provide testing and consultancy services that drive better performance. They undertake and invest in research by BRANZ science teams and external research agencies to unlock new knowledge, addressing current and emerging challenges of the New Zealand built environment.

BRANZ are approved to issue CodeMark Certificates in New Zealand

We have selected BRANZ due to their specific knowledge and science in relation to New Zealand construction methods over the decades.

The SupaWall system is the only system on the market that has a CodeMark issued in NZ by BRANZ.

BRANZ have applied an increased focus on how to manage liquid water ingress relative to the New Zealand Building Code, together with cladding systems assessment criteria in the marketplace.

How Enstall do it - weatherboard/direct fix homes

Yes, as long as there is building paper present (on the outside of the frame /  behind the weatherboards)

A typical weatherboard house with 100mm frame (in old words 4-inch framing) can achieve R2.6.  

R2.6 is well above the minimum R-Value for new houses constructed in Auckland, and meets the requirements of new homes in Zone 3 – (South Island and Central plateau).

We install from the inside. Any holes drilled through the outside produce a weak point which could fail over time. Additionally, it would put a hole through the building paper which must be present.

How Enstall do it - brick veneer homes

Yes, based on the design of the house we can fill the wooden frame together with the additional cavity

Brick veneer cavity is typically 100mm plus 40mm, resulting in an R-value of R3.6

We install from the inside and outside.

We apply a Masonry Protection Barrier to the outside faced of untreated bricks designed to prevent liquid water penetrating the brick.

For houses with brick veneer external cladding we will also need to ensure that the outside face of the brick is sealed as most brick systems are porous.  To achieve this, we will need to check the specific condition of the brick work and we will need to apply a specific sealant to the brick work.  Our quotation will outline what needs to be done to ensure effectiveness of the sealing system, and once installed the maintenance required to ensure that seal continues to perform.

Other important information

We drill 25mm holes in the wall so we can insert our directional nozzle to ensure an adequate fill in each cavity.

We offer you the choice of patching the holes using a patented system resulting in an almost good as new finish.  This can also be colour matched to existing paint as well.  Let us know at time of quotation what you require.

Yes, our installers and assessors are trained and confirmed as being competent to ensure all steps in our processes meet the CodeMark requirements.

A typical New Zealand three-bedroom home (weatherboard or brick veneer) can be insulated in less than a day by an accredited installer team. It’s quick, clean and doesn’t affect the structure or look of your house.