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Would sheep-wool insulation attract moths?

John Conlin / 20 February 2018

A reader is keen on making their extension eco-friendly, but worries that natural wool insulation might attract clothes moths.

Sheep wool insulation
A reader would like an environmentally sustainable extension, but is concerned the eco-friendly sheep wool insulation might attract moths


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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The opinions expressed are those of the author and are not held by Saga unless specifically stated.

The material is for general information only and does not constitute investment, tax, legal, medical or other form of advice. You should not rely on this information to make (or refrain from making) any decisions. Always obtain independent, professional advice for your own particular situation.