skillion header

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Skillion ceilings are architectural, and sleek. However many older skillion roofs were constructed without insulation.

Heat loss through the ceiling accounts for a large portion of heat loss in a home, so if your skillion ceiling is uninsulated, you could be losing precious heat and wasting energy and money.

In skillion roofs, the roof cladding and ceiling run parallel, typically within 300 mm of each other. The roof space is generally inaccessible and impossible to insulate with conventional segment insuation without renovation. 

While some homeowners undertake the daunting task of  removing internal ceilings or roofing to install segment insulation, this is a very expensive, inconvenient and obtrusive option.

Insulmax® retrofit blown insulation is the perfect way to finish the insulation of your skillion roof and bring it up to new home standards.




ins interior skillion 1342 sq

Why insulate your ceiling?

Ceiling insulation will keep your home warmer, drier and healthier. A home with no insulation has been estimated to loose around 40% of it's heat through the ceiling.  This makes them the first area that home owners should consider when increasing their home's insulation. Insulmax® ceiling insulation is a water-resistant, high quality, soft white mineral wool manufactured to insulate roof spaces.

Insulating your skillion ceiling space reduces heat loss from your home allowing it to retain more heat making it warmer and easier to heat.  Heating bills can be reduced and your home will feel drier, quieter and generally a more confortable and healthy place to live.  When you’re in a newer home, you’ll notice how easy it is to maintain a comfortable, dry and healthy indoor environment. Insulmax® can make this a reality in your older home as we increase your homes insulation to modern standards.

How we insulate your skillion roof


Pre-assessment of your home to ensure you and your family get the full benefit of Insulmax®.


An Insulmax® assessor checks your exisitng ceiling insulation and advises on options avaialable to bring the insulation to desired or current insulation standards. Thermal imaging equipment can be use to identify gaps in exisiting insuation which my be difficult or impossible to access from the roof space.  A quotation can be provided for various options to suit budget and requirements.

Some downlights, transformers and other heat sources cannot be covered by insulation. Our process identifies these and achieves recommended practices of clearances. Insulmax® ceiling insulation is compatible with all heat transfer and heat recovery systems.



Premium mineral fibre insulation is prepared for installation. On the day of installation, you can stay or leave your home.


The installation of Insulmax® is carried out by trained, licensed and audited Insulmax® installers to the standards of Insulmax® NZ Ltd. We absolutely pride ourselves on the professional knowledge of our staff and the quality of our installs.

The process involves :

1. All skillion cavities are located by various techniques including the use of high resolution thermal imaging equipment.

2. A 16mm (smaller than a 10 cent coin) hole is used to access each cavity. 

3. Install machinery is proprietry to Insulmax® and is calibrated on each install to achieve the optimum density.

4. A sample box is filled and weighed to ensure complete cavity fill and correct density. At correct density Insulmax® will not settle or slump.

5. All wall cavities are filled with Insulmax® mineral fibre insulation. Insulmax® is installed dry with no binders, glues, formaldehyde or volatile compounds so it's safe to stay home during the install.

6. High resolution thermal imaging equipment is used during the install to ensure that all wall cavities have been filled with Insulmax® insulation

Finishing your Install

Thermal imaging equipment is used to ensure all areas are insulated before install holes are filled

Finishing your Install

Our aim is to leave your home neat and tidy with minimum sign that it's been insulated.

The process involves :

1. Each install hole is filled with a plaster based filler.  The small 16mm installation hole makes filling straightforward and the filled hole easy to finish by the cusotmer or their agent.

What other home owners have to say about Insulmax®

Why Choose

Install assured

Insulmax® installers are independently trained, licensed and audited to assure that Insulmax® standards are maintained. High resolution thermal imaging cameras are used during and after every install to locate cavities and to assure that your walls have been completely insulated.

National support with local service

Insulmax® is the largest and most specialised retrofit wall insulation group in New Zealand. Our owner operated branches throughout the country offer local service, backed by national support and experience. Thousands of NZ home owners are already enjoying the benefits of Insulmax® retrofit wall insulation.

Ultimate install flexibility

Insulmax® is certified to be installed through ALL common exterior claddings and internal linings with or without building paper giving you the choice of how we install your home, whatever its age or cladding. We are certified to install the exterior walls of ALL types of older homes, with or without building paper.

Smallest installation hole

Insulmax® are the "keyhole surgeons of the insulation world", using an installation hole smaller than a 10 cent coin (16mm). The smallest hole size minimises the impact on your home and leaves finished installation points difficult to spot with lasting durability.

Guaranteed and certified

The Insulmax® Retrofit Wall Insulation Method was the first NZ retrofit wall insulation system to achieve CodeMark certification which demonstrates compliance with the New Zealand Building Code and is approved by every Council in N.Z. Each wall insulation install is accompanied by a 50 year written guarantee.

Environmentally conscious

Insulmax® saves tons of building materials from ending up in landfills by eliminating the need to remove wall linings. Insulmax® is made from inert minerals and is composed of 84% post-consumer waste. It is CFC and HCFC free and is classified as having zero Ozone Depletion potential and zero Global Warming potential.

Trusted in Europe and UK

Manufactured in Europe to ISO9001 standards and trusted for over 20 years in the walls of over 1 million UK homes.