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title: "6.2\tInsulating mats for the construction industry (fibres)"
canonical: "https://wiki.groenkennisnet.nl/space/HNPE/295011046/6.2%09Insulating%20mats%20for%20the%20construction%20industry%20(fibres)"
format: markdown
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The hemp bast fibre can be processed into a mat, eventually bound with a small amount of plastic fibre. For fire retardancy, some soda (an additive also permitted in food) is added.<sup>[1]</sup> Hemp fibre is mixed with finer jute fibres to improve the insulation value.

The density of such mats is approx. 35 – 40 kg/m<sup>3</sup>. The insulation value lambda is approx. 0.04 W/m.K, comparable to insulation materials made of flax, cotton, wood fibre, or cellulose pulp.

A fibre mat can also be 'bonded' by so-called needling of the fibre mat. The density of such mats is higher, approx. 130 - 175 kg/m<sup>3</sup>. These mats are suitable for sound insulation under floating floors and as a growth substrate for horticulture (§[6.4](https://wiki-groenkennisnet.atlassian.net/wiki/spaces/HNPE/pages/295011104)).<sup>[2]</sup> 

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[1] [https://www.thermo-hanf.de/en/products/thermo-hemp-combi-jute-insulation-mat/](https://www.thermo-hanf.de/en/products/thermo-hemp-combi-jute-insulation-mat/) 

[2] [https://www.thermo-hanf.de/en/products/building-materials/thermo-hemp-footfall-sound-insulation/](https://www.thermo-hanf.de/en/products/building-materials/thermo-hemp-footfall-sound-insulation/)