Spray foam insulation and Homestar ratings

We want you and your family to create lifelong happy memories in a warm, dry home. How do you know you’re building a home to the highest quality for the health and safety of your family? The independent healthy home check called: Homestar.

Homestar is a comprehensive, independent national rating tool, run by the not-for-profit Green Building Council, that measures the health, warmth and efficiency of New Zealand houses. A home is rated on a scale from 1 to 10.

Did you know the New Zealand Building code threshold has a Homestar rating of  just 3? Because spray foam insulation provides homes with the highest R-Value possible in the New Zealand market, homes that use spray foam as part of their design and build plans instead of fibreglass are achieving Homestar ratings of 6 and above.

We believe our spray foam insulation contributes to the positive health status of New Zealanders.

A 6 Homestar rating or higher provides assurance that a house will be better quality – warmer, drier, healthier and cost less to run – than a typical new house built to building code. A 7 or 8 Homestar rating means you’ve built a world leading home.

Homestar assesses a house, apartment or multi unit development against several categories including energy, health and comfort; water, waste and materials.

There are two stages to a Homestar rating:



1. Review – confirms the design is on track to achieve the desired rating. As a star rating cannot be confirmed until the design and specification is finalised, the project will receive “homestar appraised” certification if it achieves 6 or higher.

2. Rating – fully assesses the design and specification, meaning the location and orientation must be finalised. The project is awarded a star rating which must be converted to a “built” rating upon practical completion, as a design rating expires after two years.


Assesses the completed dwelling in situ. This requires a physical inspection, and can be a stand-alone assessment or a verification of the design rating.

A new home design & build collaboration between NZFoam and Fusion Homes – achieving a Homestar rating of 8.

Spray foam insulation contributes to a high Homestar rating.

To rate a home’s performance and environmental impact, Homestar awards points across seven categories: energy, health and comfort; water; waste; materials; site; home management; and an optional innovation category.

Spray foam insulation contributes to several of the categories because of it’s contribution to keeping homes warmer and drier than alternative insulation products with it’s high R-Value, helping homes use less energy due to retaining internal temperatures at a steady level, and it’s sustainability from lasting the lifetime of a home and being made from recycled materials.

“If we know the home has a Homestar rating, we automatically know it’s been built to a higher specification in terms of energy efficiency, insulation, and generally a better quality of the shell of the home. And we know that this provides a potential buyer with a great deal more healthy living environment.”

Kate Gibson, Registered Valuer
Valuation Partners

“Spray foam insulation is in common use in North America and Canada, so we were confident it would suit Christchurch’s cold winters. Using foam to insulate instead of traditional fibre glass was one of the best decisions we made for the warmth and comfort of our home.”

Garry & Monique Bond,
Homeowners (Christchurch)

“The reason we went with spray foam insulation was that we already had pink batts and polystyrene, but they didn’t live up to our expectations. Wind was even blowing through the electrical sockets! We wanted something that was wind-tight, air-tight and had high R-Value. Our home has never felt warmer, dryer or safer.”

Jason Brown,
Homeowner (Wellington)

Warmer Forever

Spray foam insulation is used in buildings in Antarctica and in space craft – but now, it is fast becoming the preferred method of insulation throughout New Zealand. At NZ Foam, we’re proud to be the leading provider of this incredible product. Contact us today to find out how spray foam insulation can make your next build project have a high Homestar rating, and keep you and your family warmer forever™.


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