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Sheep wool insulation made by Oregon Shepherd—Permaloft—is a general purpose blown-in insulation product, made entirely from US-produced sheep wool. It is a drect substitue for cellulose, fiberglass, rock wool etc.
Sheep wool does not compact after it is installed, as is the case with other products. This ensures that the R-value of your building will not diminish over time. Best of all, sheep wool insulation is a natural and biodegradable product, with no VOCs (volatile organic compounds)—compare with the toxic chemicals that make up fiberglass, mineral wool, and cellulose insulation products. Permaloft meets or exceeds all building code, fire code and safety code requirements in the US.
The wool used in the production process is typically the coarsest and darkest available. For years this type of sheep's wool has essentially been a waste product, thus making its use as insulation material even more environmentally and socially friendly. The Oregon Shepherd operation is fully committed to the most stringent environmental standards that can be achieved. All of the production process is based in the US.
R-Value of Permaloft is R-4.09 for every inch of thickness. Here are some common R-values and the amount of sheep wool insulation required to achieve them:
R-value |
Thickness |
Lbs./square foot |
R-13 |
3.2 inches |
.24 |
R-14 |
3.5 inches |
.27 |
R-19 |
4.6 inches |
.36 |
R-21 |
5.1 inches |
.39 |
R-22 |
5.5 inches |
.42 |
R-25 |
6 inches |
.46 |
R-37 |
9 inches |
.69 |
R-38 |
9.3 inches |
.71 |
R-45 |
11 inches |
.84 |
R-49 |
12 inches |
.92 |
Contact us for help in determining the amount of material you'll need for your project. These US Dept. of Energy links might be helpful as well:
For general info.
http://www.ornl.gov/sci/roofs+walls/insulation/ins_05.html
For determining the amount of insulation you'll need for a new home:
http://www.ornl.gov/sci/roofs+walls/insulation/fig2.html
…and for an existing home:
http://www.ornl.gov/sci/roofs+walls/insulation/fig3.html