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What is Loft Insulation?

Loft is a blown insulation designed to for New Zealand roofs that delivers a high thermal performance.

Loft Roof Insulation is the ideal solution to efficiently and properly insulate large attic or ceiling spaces. Installers can work efficiently because blown-in insulation fills spaces around trusses, wires, pipes and irregular-shaped cavities creating a complete thermal barrier for your roof.

The Benefits of Loft Insulation

Roof insulation is a simple yet effective solution that can provide numerous benefits to homeowners. It seals the thermal envelope of your home, keeping the heat inside during winter and the cool air inside during summer, and the benefits don’t stop there!

Improve Energy Efficiency

Roof insulation is that it helps regulate the temperature inside your home, lowering energy costs and saving money.

Reduced Noise Pollution

Maximise your potential and achieve better results by identifying and overcoming obstacles.

Maintain Consistent Temperatures

Roof insulation helps to keep your home at a consistent temperature, making it more comfortable throughout the year.

Improved Indoor Air Quality

A well insulated roof or ceiling helps to prevent air leaks and improves indoor air quality making your home drier and healthier.

50 Year Durability

Loft Insulation comes with a 50 year durability rating which means it will last the life of your home.

High Thermal Performance

Loft Insulation is known for delivering higher thermal performance that most other roof insulation products.

Why Insulate Your Roof?

Good roof insulation is a critical step towards achieving a warm, comfortable, and energy-efficient home, particularly for New Zealand’s varied climates. The roof is a primary area of heat transfer within a home and can be responsible for as much as 50-60% of a home’s heat losses and gains. A well-insulated roof acts as a barrier against this heat loss and gain, helping to maintain a more consistent and comfortable indoor temperature all year round. It results in less strain on your heating and cooling systems, leading to substantial energy savings and a reduced carbon footprint.

When it comes to insulating your roof, blown insulation is an excellent option, particularly for tight roof cavities and skillion roofs.  It can reach and fill even the tightest corners, crevices, and hard-to-reach areas that traditional insulation materials may struggle to cover. This capability to provide a uniform thermal barrier across the roof area significantly minimises heat transfer and enhances the overall energy efficiency of your home.

Product Technical Information

The following table shows R-Values when Loft Insulation is blown into a cavity at various densities. These values are indicative and are based on standard timber frame construction.

Nominal Thickness
(M2 K/W)
(0.043 W/mK at 15°C)

12 kg / m3


12 kg / m3


12 kg / m3


12 kg / m3


12 kg / m3


12 kg / m3


12 kg / m3


12 kg / m3


12 kg / m3


12 kg / m3


12 kg / m3


12 kg / m3

Total R-values assume 18% thermal bridging as per H1/AS1 & may alter in roofs with more or less framing timber.

Where can you install Loft Insulation?

Loft is right at home in an open attic or roof space. The product is blown into the ceiling cavity and depending on the density can achieve thermal performance values ranging from R1.0 to R10.0

  • Loft Installer Blowing Insulation Into a Roof

    Open Roofs

    Loft Insulation is the ideal product for blowing into an open roof cavity for complete coverage and high thermal performance.

  • Blown Insulation Installed in Skillion Roof

    Raked or Tight Ceilings

    Loft blown insulation is ideal for insulating cavities where ceiling access is limited or you have a raked roof.

  • Loft Insulation being installed into a ceiling

    New Builds

    Loft Insulation is the ideal product for blowing into an open roof cavity for complete coverage and high thermal performance.

Frequently Asked Questions

Get all the information you need to make an informed decision – explore our FAQ section and find answers to your most pressing questions about Loft Insulation and roof insulation in general.

Is Loft Insulation completely safe for the family?

Loft is made up to 80% recycled glass and inert materials that are non-combustible and can help inhibit the spread of fire. For recessed lights we specify XLP protectors around every light. Loft is a non combustible material.

Loft mineral wool insulation will not exceed the Gib 2010 Guide maximum weight until R10, so is suitable for most gib board or plaster ceilings. The most critical factor for safe, long-term performance is a correct installation system. Loft is a proven performer since 1995.

Loft Insulation is extremely durable and has a life expectancy of over 50 years!

Why is roof insulation so important?

I bet you didn’t know that over 30% of your homes heating cost could be attributed to the fact your room may not be insulated? The same can be said about over 30% of your comes cooling costs!

Well once you know its quite obvious. Warm air, without something blocking it and left to its own devices, will tend to raise upwards. Whereas colder air will tend to drop. Pretty obvious so far.

Now think how this simple physics interacts with a roof or ceiling without insulation. If your heating a room, that heated air will tend to ‘sit’ against the ceiling – warming the ceiling. So if it is not insulted that warmth gets transferred into the roof space and outside your house! Also the loss of the heat results in the cooler air ‘dropping’ in the room, so you end up with a thermal cycling of the warm air to the ceiling until all the available warmth is lost. This is very expensive.

A similar thing happens when you try to cool a room but in reverse. During a hot day the roof space gets very hot, and given its a roof with no real holes in it you get a ‘stack’ of hot air sitting in your roof space heating up everything it touches; including the ceiling. So then the ceiling starts to get warm and in turn heats the air against it. Now where are most fixed aircons in homes?. Yes, right up high on the wall, so they are then trying to cool down already warmer than normal air. Its actually worse than this, as the temperature gauge in the aircon unit is constantly measuring the temperature at its on the wall location and not that at floor level, so it will try to ‘over cool’ when it does not need to.

Put both of these together and you will find 40% of both your heating and cooling costs are going out of the roof!

Talk to one of our friendly Loft Insulation resellers to find out how you can have your ceiling insulated!

Why choose Loft blown roof insulation?

Quite simply Loft ceiling insulation works to keep the outside temperature out and the inside temperature in! Think of it like a lid on a chilly bin or vacuum flask, if you put hot food in it stays warm and if you put cold food in it stays cold. It works to stop/slow temperature transfer. The better the insulation grade or type of insulation product you use the less temperature transfer there is, so the better the insulation works. Inadequate ceiling insulation and air leakage are leading causes of energy waste in most homes.

Correctly designed & fitted insulation:

  1. Saves money and our nation’s limited energy resources
  2. Makes your house more comfortable by helping to maintain a uniform temperature throughout the house
  3. Ceilings warmer in the winter and cooler in the summer.

Poorly insulated homes are usually cold & damp, with occupants crowded over a heater in one area to keep warm. Homes insulated with the full proven systems like Loft use similar amounts of energy to keep your whole home at a healthy, comfortable temperature.

How good is Loft Insulation?

Loft is a premium insulation produt, and one of the best insulation products available allowing you to keep the outside temperature our and the inside temperature in!

The total installed thermal roofing insulation effectiveness of Loft is superior to batting or blanket, as it covers the full ceiling – without joints, gaps, thermal bridging, or vented cavities commonly found between linings and batting or blanket insulation. It provides premier insulation values. Batting insulation or blanket materials need at least two layers to achieve the same installed thermal effectiveness of Loft insulation.

Old insulation removal may be necessary before new Loft insulation is installed eg insulfluf removal. Talk to us today about installing Loft insulation into your roof or attic.