The Wool Advantage

Wool is an extremely effective insulator. It is designed to keep sheep comfortable – often in harsh conditions.

The unique qualities of wool give Terra Lana an advantage over other insulation types and offer further benefits to your home living environment.


The natural design of wool fibre enables it to 'breathe' by actively absorbing and releasing moisture in the air. This process also releases and absorbs energy as heat, causing wool to act like a thermal mass. Terra Lana’s ability to breathe makes it drier, as well as warmer in cold weather and cooler in hot weather. Brilliant!


Wool's crimp or waviness and scaly surface of it’s structure push and hold the fibres apart to make insulative air pockets, further allowing it to ‘breathe’.


Within specially designed construction systems, Terra Lana can reduce moisture and condensation, while it works to regulate temperature  (Refer to the ForeverBreathe construction system).

A drier home is easier to heat, saving energy and is healthier and less prone to mould and mildew.

More on breathability »



As Terra Lana naturally regulates the air and temperature in your home, the atmosphere is more comfortable – being both drier and warmer (or cooler in hot weather). With drier air you will feel and stay warmer than in damper air of the same temperature.


Wool actually absorbs toxins from the air around it!

Sick building syndrome is a well documented illness caused by toxins emitted from building materials (such as formaldehyde) and from moulds and mildew. Terra Lana works against that for you, locking those toxins away in its structure.


Formaldehyde is commonly used in resin-based wood products such as chipboard or customwood and is also found in finishes, furnishings and floor coverings. Formaldehyde is slowly released from these products as the resin hydrolyses. The emissions increase with temperature and humidity. Wool molecules bind with the formaldehyde molcules in such a way that the result is irreversible and reemission does not occur. Thus wool is able to effectively and permanently remove formaldehyde from indoor air. Terra Lana natural wool insulation is capable of absorbing close to 100% of the formaldehyde commonly found in most new buildings.


Sulphur dioxide and nitrogen dioxide are by-products of combustion processes using petroleum products and coal, and are produced by gas cookers, open fires and vehicle exhausts. Wool is able to trap these harmful gases in the same way, thereby filtering your breathable air.


Terra Lana Wool Blend Insulation is made from natural wool and polyester (like a good pair of socks!) and is naturally toxin free, unlike many building materials used today.

Terra Lana natural wool blend insulation does not contain formaldehyde. It is also naturally resistant to mould, so no added chemicals required there either.


The wool in Terra Lana is predominantly sourced from carpet manufacturers.  Hundreds of leftover part used spools of twisted yarn are reclaimed with our special machinery that turns it back into useable fibre. We recycle all our off cuts too.   Terra Lana Wool Blend Insulation is 100% recyclable at the end of a homes life.



When it comes to sustainability, renewable resource and recycled materials are the answer. We use a blend of clean, pre-consumer recycled wool and some virgin wool, bonded together with polyester.



Terra Lana is non-toxic, non-irritating and safe to handle.  You’ll have no complaints installing it without any protective clothing or mask.

It’s easy to rip to length by hand, and can be cut if required simply using hand held sheep shears or a knife.



A New Zealand product through and through ~ sheep’s wool, innovation, natural, quality, effective, value, sensible, and of course - made right here. Good as gold.

DURABLEwool crimp waviness diagramwool fibre construction cross section, microscope image

Wool will last the life of a home without breaking down. To remain effective, insulation fibres must form pockets of still air. Wool fibre structures not only have insulative air within, they  also have a very resilient crimp - or waviness which pushes them apart to create air space between. Tiny scales on the fiber surfaces hook them together so the wool stays fluffed up. The result – longer lasting insulating performance that doesn't slump over time.


This is critical when choosing an insulation product, because the material will only insulate effectively as long as it keeps its loft.


QUIETIERTerra lana acoustic insulation noise insulation diagram

Wool has excellent acoustic insulating properties too, so it helps keeps the noise down through walls, floors and ceiling. It works by forcing sound waves travelling through it to bounce off the millions of fibres the insulation is made up of. Every disruption to the sound wave causes it to loose energy and become quieter. This reduces the noise entering your house (traffic, machinery, wind) and the noise created within your house (TV, stereo, children), making your home more peaceful.


Terra Lana's Chatterblock insulation is designed especially for maximum accoustic insulation.




Quality is usually better valued over time.  Terra Lana is all the more so, because:


LIFE OF HOUSE : Terra Lana is here for the life of your house and won’t need costly reinstalling.


LASTING PERFORMANCE : Because it retains its loft and fit, Terra Lana insulation will continue to perform, and you’ll continue saving more on energy and through all the benefits of a drier, healthier home environment.


HEALTH : There’s not much that’s more valuable than your family’s health. Terra Lana goes beyond the call of duty here when it comes to insulation. You’ll never regret opting for a healthier choice.


COMFORT : Keep enjoying the benefits of a warmer, drier, purer, quieter home environment.


CONDITION - A drier building is less prone to costly repairs and maintenance.


ENVIRONMENT - by investing in our future environment through using recycled, recyclable or biodegradable and renewable materials, we all save in big ways in the long term – and you benefit now!



Terra Lana’s insulation and insulating systems have been designed and developed to deliver superb performance standards. They comply with or exceed building standards and are BRANZ appraised (appraisal number 862).


Because of it's unique advantages as an insulator, our wool blend insulation can actually outperform synthetic insulations of the same R value rating!


When you add it all together, the qualities of Terra Lana insulation combine to make an exceptionally effective solution to make your home a more comfortable, warmer, healthier environment. And because it lasts, it’s also a cost effective choice, as an investment over time.



With it's excellent, lasting insulative performance, Terra Lana is not a cost, but an investment. It will typically pay for itself within a number of years through energy savings. After that, those savings are a profit return on your investment – for the life of your building.



Terra Lana will not only enhance your home by making it warmer longer and easier to heat, but more healthy too. When tomorrow finally comes, you’ll appreciate how you’ve saved on energy, on health, home maintenance, reinsulating, and on environmental impact.

We have heard it so many times before “once you have insulated with wool you will never look back."


Wrap your home in the superior natural warmth of Terra Lana Wool Blend Insulation ~ it’s the natural choice for your home, family and future.





For an average house with timber floor, installing insulation can reduce total house heat loss significantly:


8%    Underfloor insulation

20%  Wall insulation

43%  Ceiling insulation

50%  Ceiling and underfloor insulation

70%  Ceiling, underfloor and wall insulation

80%  Ceiling, underfloor and wall insulation + double-glazing


N.B. These proportions are approximates and depend on the geometry of the house (e.g single or double story) and the climate (the colder the climate, the proportional heat loss through the roof reduces, and the proportional heat loss through the floor increases).

Source: From internal modeling undertaken by Energy Efficiency and Conservation Authority (EECA) in November 2008 to help determine the star bands for the Home Energy Rating System (HERS). The modeling used the AccuRate residential energy modeling software.



Insulating your home doesn't cost money – it saves money!  A typical household of four people spends around $2,800 a year on home energy (Statistics New Zealand, Household Economic Survey:2007). About 40% of this energy is used to heat or cool your house. Home insulation can cut this cost by up to 40% (depending on climate, type and size of home, etc), by stopping that energy and temperature from being lost to the outside. That equates to around$500 in energy savings per year.



Less energy used heating and cooling homes is that much less energy generated from the power stations burning fossil fuels to produce electricity. Coal fired generators are one of the biggest contributors to greenhouse gases and are responsible for generating one fifth of New Zealand’s total greenhouse gas emissions.



Insulation is also an effective barrier to noise, from outside, or between rooms.



The reduction in heat movement results in a home that is warm in the winter and cool in the summer. Insulation also provides a drier environment by preventing condensation. Condensation occurs on the inside surface of a roof or ceiling at any time when the temperature of the surface is at or below the dew-point of the air in contact with it. Insulation raises the temperature on the insulated surface above the dew-point temperature, thus inhibiting condensation. Insulation can also help reduce mould growing on the inside of your walls and ceilings.









"...It is the most remarkable fibre. Because wool is a living material, it has a natural cell structure which allows it to adapt to its environment; wool absorbs moisture and releases it later to regulate humidity so, of course, this makes it a brilliant chemical-free insulating material. Most importantly, though, as you have witnessed today, wool has remarkable fire resistant and fire retardant qualities."

HRH The Prince of Wales



© Terra Lana Products Ltd 2014 - 2017