Oregon Shepherd’s standard “blow box” is a box of 40 pounds of loose sheep wool insulation.
Installed in vertical applications such as walls in a conventional home, target at least 0.97 pounds per cubic foot (minimum density) and up to 1.2 pounds per cubic foot (premium density), thus between 33 and 41 cubic feet per 40-pound box.
Installed in horizontal applications such as attic/ceilings or floors, target 0.92 pounds per cubic foot, thus about 43 cubic feet per box.
This product is shipped compressed to about a 6-to-1 ratio, so allow for some extra wool if you will be installing manually without an insulation blower (because a blower would help fluff the wool to the target density). Also consider extra material if installing in an application subject to settling due to vibrations, such as a van conversion.
What Your Architect, General Contractor, And Insulation Installer Should Be Telling You About Wool Insulation:
- Harmful chemicals are in your walls; sheep wool filters the air and improves indoor air quality. The amino acids in wool irreversibly bond with formaldehyde, NOₓ and SO2 on a molecular level.
- Moisture and climate control – moisture and mold happens in your walls. Sheep wool absorbs and adsorbs it against 65% relative humidity.
- Sheep Wool Insulation suppresses mold and mildew – natural keratin prevents against the spread of mold and mildew.
- Sheep Wool Insulation absorbs sound – wool exceeds other forms of insulation as an acoustic buffer.
- Sheep wool naturally resists fire – wool will not support a flame below 1100F; conforms to Class A of the ASTM E84 test.
- All natural – sheep wool insulation is entirely renewable and sustainable.
- Long lasting – inherent characteristics allow stated R-values to exceed other forms of insulation.
- Sheep wool does not off-gas – natural characteristics make our insulation devoid of harmful chemicals.
- Installs easily – blown-in and batts are installed like other mediums but with no protection required.
Why you should choose sheep wool insulation
Sheep Wool Improves Indoor Air Quality
The inherent construct of a wool fiber traps air and in turn insulates your home. It also does much more. Sheep wool insulation removes dust particles which may contain harmful chemicals such as formaldehyde, nitrogen oxide and sulphur dioxide. The amino acids in wool irreversibly bond with these chemicals in both a chemical and physical manner. The former, called chemisorption is ~80% of the bond and is irreversible; the balance is physisorption and only unwinds at extreme temperature or moisture levels. No other type of insulation offers these unique capabilities. On the contrary, most conventional insulation mediums are emitting or ‘off-gassing’ harmful chemicals. This can lead to adverse health effects and reduced indoor air quality.
Sheep Wool Manages Moisture
Sheep wool fibers inherently manage moisture, absorbing and releasing it against 65% relative humidity. This allows for condensation to be minimized as wool generates heat from energy, thus making it warm when wet. Equally important, sheep wool is a keratin and therefore will not support the growth of mold. These characteristics, on their own, make sheep wool an outperformer as an insulator; on a relative basis it is second to none.
Visco-elastic properties of a sheep wool fiber assist in the conversion of sound energy to heat. What’s more, a wool fiber is unique in its ability to simultaneously reduce air born sound, surface noise and sound transmission.
Resistance to Compression
Resistance to compression (R to C) is the force per unit area required to compress a fixed mass of wool to a fixed volume. Resistance to compression is related to fiber diameter and the form and frequency of crimp. For instance, high R to C wools have a harsher handle, are resistant to felting and are bulkier. Studies show the majority of wool finer than 28 as being in the middle resistance-to-compression range (53%). On the other hand, some 73 percent of the wool coarser than 28 micron was evaluated to be highly resistant to compression. Our wool is >35 micron.