Foreverbreathe™ Wall System

Health Based Building is proud to announce our recent partnership with the Asthma & Respiratory Foundation NZ’s Sensitive Choice® Program. The Foreverbreathe Wall System now wears the Sensitive Choice® blue butterfly logo. Following Sensitive Choice’s Product Advisory Panels rigorous review, Foreverbreathe Wall Systems has shown to offer a potential benefit to those with asthma and/or allergies by improving indoor air quality and reducing humidity levels using environmentally friendly, vapour permeable material content. Foreverbreathe Walls Systems are the beginning of what will be HBB establishing indoor air quality standards, with a strong focus on respiratory health for all built environments.

  • Air temperature decreases
  • Relative humidity increases
  • Moisture is absorbed into wool fibre
  • Energy is released
  • Air temperature increases,
  • Relative humidity decreases,
  • Moisture is evaporated out of the wool fibre
  • Energy is absorbed.

These exclusive HBB vapour permeable materials form the main component material layers within the system. All come with independent testing of importance to durability and system performance

Terra Lana wool insulation within Foreverbreathe™ wall systems can

  • Act like a very considerable thermal mass,
  • Resist the change in temperature,
  • Flatten out the peak highs and lows of temperature,•Improve the comfort of homes
  • Reduce the energy required to heat and cool a home
  • Wool fibre is hygroscopic ~ it can absorb and release moisture  from the air. This phenomenon is known as ‘breathing’
  • Within specially designed Foreverbreathe™ wall systems, Terra  Lana will absorb moisture vapor, reducing condensation and  creating warmer healthier environments
  • A drier home is easier to heat, healthier and less prone to condensation, mould and mildew.
  • For every litre of water absorbed into and evaporated out of  Terra Lana 0.628 kWh of energy is released or absorbed.

So as temperature is decreasing, Terra Lana could absorb up to 33.7 litres of water (4%*) releasing 21.2 kWh of energy

Moisture Regulation of Wool and Polyester Based Insulation Materials


  • Wool will last the life of a home without breaking down.
  • To remain effective, insulation fibres must trap air and form  pockets of still air. 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.


Wool has excellent acoustic insulating properties too, so it helps  keeps the noise down through walls, floors and ceiling.


  • Non-toxic,
  • Non-irritating
  • Protective clothing or mask not required
  • Rips to length and can be cut to size at factory



The wool fibre in Terra Lana actually absorbs toxins such as  formaldehyde out of the air around it.  Wool molecules bind with  formaldehyde molecules in such a way that the result is irreversible  and reemission does not occur.


The wool in Terra Lana is predominantly sourced as short length and  odd colour fibre from carpet manufacturing that is uneconomic for  the carpet manufacturers to reuse themselves.

We recycle all our off cuts and Terra Lana can be recycle at the end of a homes life



A New Zealand product through and through, developed, owned and operated by entrepreneurial New Zealanders

Health Based Building

New Zealand's Health Based Building Materials Specialists. An exclusive range of building materials aligned to health, performance and the true meaning of sustainable development. Hardwood and softwood timber, vapour permeable exterior and interior wall boards, breathable paints and oil coatings.