things you need to know about insulation that your architect and gc should be telling you:


Air Filtration/IAQ - Harmful chemicals are in your walls; amino acids in wool irreversibly bond with formaldehyde, NOx, SO2 on a molecular level

Moisture / Climate Control -  Moisture and mold happens in your walls; wool absorbs and adsorbs it against 65% relative humidity and is a keratin that will not support the growth of mold

Sound Absorption - Wool exceeds other forms of insulation as an acoustic buffer

Thermal Conductivity - Wool batts are industry standard at 3.6 per inch; loose-fill outperforms at 4.3 per inch

Fire Resistant -  Wool will not support a flame below 1100F; conforms to Class A of the ASTM E84 test

All Natural - Wool insulation is entirely renewable and sustainable

Long Lasting - inherent characteristics allow stated rvalues to exceed other forms of insulation

No off-gassing - Natural characteristics allow our insulation to be devoid of harmful chemicals

Installation - Blow-in and batts are installed like other mediums but with no protection required

"Improve your air quality, improve your life"

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Wool's Construction

Wool’s five follicles and natural crimp, trap air, moisture and harmful chemicals so as to improve air quality while keeping warmth inside during winter and outside over the summer months. Principal components are protein molecules, or keratin. Each is made of hundreds of amino acid units that bind together in a way that allows for wool's unique characteristics. 

  • A wool fiber is resilient and elastic; it can be bent on itself over 20,000 times, yielding a longer life than most fibers
  • The scaled structure allows for absorption and retention of airborne dust
  •  The helical nature lends to enhanced sound absorption
  • Volatile chemicals, such as formaldehyde, are naturally consumed from the atmosphere and retained
  • Wool's principal component being keratin makes it biodegradable


Havelock Wool offers both batt and blow-in insulation: R values are 3.6 per inch and 4.3 per inch respectively. "R" means resistance to heat flow and the higher the insulation R-value, the greater the insulating power. Our wool insulation R-values are equal to or often surpass those of non-wool insulation. The extreme high integrity of a wool fiber allows it to out perform the synthetic competition with an exponentially decreased environmental impact.

For more facts and data about wool as an insulator, please download an informational brochure and bring your residential or commercial insulation project into the realm of sustainable, non-toxic high performance.

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Wool vs Synthetics diagram

Other mediums like mineral wool, cotton or glass wool insulation cannot measure up to the capabilities of Havelock's sheep wool insulation. Wool's inherent characteristics allow it to physically breathe by allowing moisture to be absorbed and desorbed against 65% relative humidity. Harmful chemicals, such as formaldehyde, nitrogen oxide and sulphur dioxide, are actually removed from the air. No other type of insulation offers this unique function. In fact, most others are often emitting harmful chemicals and/or adversely affecting indoor air quality. 

Other forms of so called 'wool' insulation are lacking in inherent character. Glass wool or fiberglass is a synthetic, low integrity fiber that is simply not enjoyable to be around. Simply put, why breathe shards of glass if you don't have to.

Mineral wool insulation is a decent product on its own; however, its net embodied energy leaves a huge footprint and formaldehyde continues to be used as a bonding agent. Cotton insulation is a nice idea, but like its synthetic brethren the fiber is of low integrity. Moreover, cotton is highly susceptible to mold when moisture inevitably infiltrates the cavity.

Sheep have been adapting to severe climatic environments for thousands of years. Over such time, their wool has evolved to offer protection from the elements of each season – hot and cold; damp and dry. Simultaneously, man has come to understand the benefits of wool and created numerous applications for its inherent advantages.