Hemp fibre insulation for ‘breathing construction’
'Isonat is made from hemp and recylced cotton. All the hemp is grown on UK farms without the use of herbicides and pesticides. The fibre is extracted in an entirely mechanical, chemical free and waste free process. The woody by-product form the hemp plant is used as a high quality horse bedding.
The recycled cotton fibres come from a waste stream from the cotton processing indusry. We use cotton fibres that would otherwise go to landfill.
To meet UK fire performance standards we treat the fibre with a low level of a harmless phosphate based fire retardant.
The natural fibres are bound together using a polyester binder, which also helps with the maintenance of loft. This binder is harmless, but it is synthetic. We are currently involved in a research project which we hope will lead to the use of a completely natural bio-derived alternative.
We estimate that Isonat uses a fraction of the energy (and carbon) when compared to other insulation products. Of course, hemp also fixes substantial quantities of carbon during growth. We are currently subjecting Isonat to a rigourous third party assessment of its cradle-to-grave (life-cycle) environmental performance. This analysis will employ a standard methodology to enable a direct comparison between Isonat and other products made from mineral fibres and petro-chemical foams.
When used appropriately, Isonat can be expected to last for the life of the building. At the end of the its useful life, Isonat can be simply disposed of by composting or incineration.
Thermal Conductivity (K) = 0.039 W/m.K'
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