In recent years, natural materials have become a valid alternative to traditional sound absorbers due to reduced production costs and environmental protection. Sheep wool has a comparable sound absorption performance to that of mineral wool or recycled polyurethane foam without the environmental issues that come with these alternatives. In conventional construction, most of the materials used do not rarely respect the environment, since they require high energy expenditure for their extraction, transport, and transformation.
You only have to look at a Highland sheep breed in its dense, long fleece standing in the snow to understand the special thermal capacity of wool. It seems warm to the touch, while cotton feels cool, for example.
Wool absorbs, retains and releases moisture without affecting its thermal properties. This makes it perfect for use in breathable buildings, listed and ancient structures, and anywhere where moisture is a concern. This is also why it is great to wear – it keeps feet warm but dry, even inside welly boots.
Another intriguing and useful property of wool is its ability to NOT catch fire! In its natural untreated state wool does not burn, but instead forms a self-insulating char that prevents further flame spread and extinguishes itself (wool has a very high inflammation point of 570 – 600°C due to its high nitrogen content of ~16%). Wool is self extinguishing because of its high Limiting Oxygen Index (LOI=25.2), which means to completely burn wool an oxygen content of 25.2% is necessary whereas normal air only has a 21% content.