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.

Wool's Benefits

All Natural - Wool insulation is entirely renewable and sustainable

Moisture Control -  Wool naturally manages moisture levels against 65% relative humidity

Fire Resistant -  Wool is inherently known to extinguish after smoldering 

Long Lasting - Extensive useful life

No Harmful Chemicals - Natural characteristics allow our insulation to be devoid of harmful chemicals

Noise Reduction - Wool creates acoustic advantages in minimizing airborne sound

Disposal - Wool insulation can be composted at the end of an extended useful life

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

wool fiber[1].png

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.

14.KOV.XXX Havelock Wool Web Table Images2.png
Wool vs Synthetics diagram