Naturheld - Flex

Naturheld Flex flexible wood fibre insulation is a natural product, which comes from renewable and sustainable PEFC certified timber off-cuts. These off-cuts are sourced from Naturheld’s own sawmill and only new timber is used. Because the CE-marked
wood fibre insulation significantly reduces heat loss from buildings, carbon emissions into the atmosphere are greatly reduced. Due to Naturheld Flex’s high density of 50 kg/m³ it is very slump resistant and easy to install between studs, rafters and floor joists. It also absorbs airborne noise within cavities.

Naturheld Flex is both hygroscopic and vapour permeable due to its fibrous content. This means that it can absorb water vapour from the internal atmosphere and this will then travel through the building fabric so that it can be released to the outside by evaporation. This provides a drier, healthier and more comfortable internal micro-climate and significantly reduces any possibility of mould growth and condensation on the internal surfaces. Breathable insulation is particularly critical to keep timbers dry preventing decay and rot.  A dry structure is both warmer and healthier.

Naturheld Flex insulation provides excellent thermal resistance – it has a thermal conductivity figure of 0.036 W/mK which is similar, or even better than most common man-made insulation materials. It is denser than most other flexible insulation materials which means it very snugly fits within vertical cavities without sagging or falling out. 

This product can be applied and used from a mixture of things such as, roofs, walls and floors. Naturheld Flex is easily cut with an insulation knife. It can also be cut with a hand saw or an alligator saw with a serrated blade. It is recommended to wear a dust mask for protection when cutting the insulation batts. Naturheld Flex will not irritate normal skin unlike many popular man-made flexible insulation products and so uncomfortable protective clothing is not required when fitting the insulation. Keep the slabs dry when in storage and protect from damage.