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Roof Insulation

Why is Roof Insulation so important?

Roof insulation is crucial for maintaining a comfortable and energy-efficient home. By effectively insulating your roof, you prevent heat from escaping during the winter and keep your home cooler in the summer. This not only ensures a consistent indoor temperature but also significantly reduces energy bills.

Investing in roof insulation enhances the overall durability and value of your home, contributing to a healthier living environment.

We Insulate Most Roof Types

Blown insulation is suitable for most New Zealand ceilings and attics, including traditional truss or open roofs and raked or skillion ceilings.

Traditional Truss / Open Ceilings

For traditional truss or open ceilings, our installation process involves evenly distributing blown insulation material across the entire roof space. This method ensures that all gaps and cavities are filled, creating a continuous thermal barrier that effectively prevents heat loss and improves energy efficiency. Our skilled team uses specialised equipment to reach even the most challenging areas, ensuring thorough coverage.

Raked / Skillion Ceilings

When insulating raked or skillion ceilings, we carefully inject blown insulation into the confined spaces between the ceiling and the roof. This technique maximises thermal performance without compromising the structural integrity of your roof. Our approach ensures that every inch of the cavity is insulated, providing superior protection against temperature fluctuations and enhancing overall comfort.

Benefits of Roof Insulation

Insulating your home offers numerous advantages, enhancing overall comfort and health. Key benefits include:
  • Warmer & Drier Home
  • Save on Energy
  • Reduced Heat Loss
  • Less Risk of Illness

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.

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.