Sheep's wool insulation, now available in the US, is an alternative to fibreglass. Commonly used in the Europe, Australia and and New Zealand, sheep's wool is recyclable, safe to install, and makes sense— after all, sheep are built to withstand hot, cold, damp and dry seasons.
Wool is also not irritating to the respiratory system or the skin like fiberglass, because of the larger size of the individual fibres. It can absorb and break down indoor air pollutants such as formaldehyde, nitrogen dioxide, and sulfur dioxide. However, it's not perfect. The insulation is treated with Borax, which does have a much lower toxicity than something like fibreglass insulation, but it does have relatively high toxicity levels. It's also a bit more expensive than regular insulation.
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