We are having an extension built and are keen to use natural materials. Our builder suggested sheep-wool insulation, but we are worried about it becoming a haven for moths. What is your view?
You have an enlightened builder. Sheep-wool insulation is highly effective, not only at reducing heat loss but also at maintaining a uniform humidity balance. Its manufacture has a vastly smaller carbon footprint than other insulation materials.
In recent years all sheep-wool insulation has been mothproofed. Most is treated with Thorlan, which conforms to ISO 3998. A non-chemical treatment called ‘Ionic Protect’, which changes the cellular structure of the wool making it inedible to moths and other insects, is gaining popularity.
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