Terra Lana Exterior Wall Insulation

Wool blend insulation rolls

Terra Lana Wool Blend Insulation evolved from work done in the 1990s by the Wool Research Organisation of New Zealand (now AgResearch) and makes the most of a product that has been designed by nature to regulate heat. Sheep’s wool is a natural New Zealand resource that is renewable, good for the environment and good for people. 

To create Terra Lana’s Exterior Wall Insulation, recycled wool off-cuts from textile and carpet manufacturers - and some virgin sheep wool - are mixed with non-toxic polyester from recycled PET bottles, which helps hold the fibers together. This blend creates a product that is dense, rigid and resistant to slumping. It has up to 50% more fibre than non-wool insulation products and is also more breathable and more durable.

Exterior Wall Insulation rolls are supplied in 2.6m lengths to fit 2.7m stud heights, but can be customised to fit specific buildings. This reduces waste and eliminates the need to install two pieces of insulation in one hole.

Sustainability benefits of Terra Lana Exterior Wall Insulation

Warmer, drier buildings

Wool has unique natural qualities that gives Terra Lana’s insulation a performance edge. Unlike its synthetic counterparts, it acts like thermal mass, moderating the change of temperature within a building to create a more comfortable environment. Wool blend insulation is also breathable. In the cooler months, Terra Lana’s insulation absorbs moisture from the air in the form of vapour - up to 30% of its weight - and releases latent heat in return. When the air is warmer, the wool releases this moisture, cooling down indoor air and keeping the insulation dry. Because moisture is absorbed as vapour, not as a liquid, Terra Lana insulation also prevents the formation of mould and mildew.

Appraised by BRANZ to last for 50 years and backed by a 50-year warranty, Terra Lana’s products maintain their structure across a building’s lifespan. Denser fibers together with wool’s natural loft prevent the insulation from slumping and help it retain its R-value over time.

Healthier, cleaner indoor air

Made using a natural material, Terra Lana Insulation is toxin free, non-allergenic, non-irritant and odourless. It’s manufactured and can be installed safely, without the need for protective clothing or masks. More importantly, wool can contribute to making indoor air healthier as it absorbs toxins and permanently traps them within its cellular structure. These toxins include formaldehyde, emitted by building materials and furnishings, as well as sulphur dioxide and nitrogen dioxide, produced during combustion by gas cookers, open fires and car exhausts.

Reduced waste throughout its lifecycle

With Terra Lana’s Zero Waste policy, natural and degradable materials - such as recycled wool from the carpet manufacturing process - are used to make an insulation product that is 100% recyclable. Additionally, any unused off-cuts from its installation are taken back to the factory and recycled into more insulation, keeping the loop closed.

Terra Lana's products come from recycled materials and can be recycled at the end of their lifespan. The company operates a Zero Waste policy.

Terra Lana is made in New Zealand and holds a Declare label from the Living Future Institute, which promotes transparency in the manufacturing process by disclosing the complete list of ingredients in the insulation and providing information about the product’s disposal at the end of its lifetime.


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