Sisalwool 100 - Natural Fibre Insulation

Sisalwool is a high performance, low carbon insulation solution crafted with longevity and comfort in mind. Made entirely from natural fibres and free from harmful chemicals or irritants, its safe to handle no gloves, suits or masks required! Installation is quick and hassle free. Our insulation slabs are designed to friction fit snugly between rafters, joists, and stud walls, making it ideal for both seasoned builders and DIYers.

Thanks to its natural fibre composition Sisalwool 100 is breathable, making it suitable for both new and retrofit projects. Each batch is sustainably produced with fibres such as recycled coffee sacks and off cuts from the clothing and carpet industries; all materials that would otherwise end up in a landfill.

Why chose Sisalwool?

-Breathable
-Class A sound absorption 
-Easy friction-fitted
-Eco-friendly
-Thermal efficient
-Sustainable, low carbon product
-Anti-irritation
-Suitable for retrofit and new builds
-No harmful chemicals
-User friendly

FAQ

Is Sisalwool fire resistant?

Sisalwool successfully passed the Euro-class E (Reaction to Fire) surface spread of flame test, a classification. making it fully approved for use on non-boundary walls in buildings up to 18 meters high. In this test, a direct flame, like a lighter, is applied to the material. Once the flame was removed, Sisalwool self-extinguished, demonstrating its fire-resistant properties.

But in true Sisalwool fashion, we didn’t stop there. We went one step further. To prove just how robust Sisalwool is, we thought why not do the test again, but this time with a blow torch? The results speak for themselves. 

Watch the video here

How well does Sisalwool handle moisture?

Sisal fibres have a naturally breathable structure that allows vapour to pass through, helping regulate indoor humidity and reduce the risk of condensation or mould. Combined with wool’s ability to absorb and release up to 30% of its weight in moisture without feeling damp, Sisalwool insulation helps maintain healthy indoor environments – ideal for traditional buildings that need vapour openness and long-term stability.