Wood Fibre Insulation



Industrially produced wood fibre insulation was introduced around twenty years ago after engineers from the timber producing areas of Europe devised new ways of transforming timber waste from thinnings and factories into insulation boarding.

The success of wood fibre insulation derives from an attractive environmental profile combined with a whole bag of functions including rigid insulation, sheathing and sarking for timber frames, roofs and flooring as well as flexible insulation for studs and rafters.

Wood of course is renewable, it sequesters carbon during its growth and product production is relatively free from pollution. The insulation value of wood fibre boards is not as dimensionally efficient as some of the orthodox petro-chemical materials - but it's no slouch either - typically coming in with a 'k value' range of between 0.038-0.043 W/mK depending on format.

Other features include 'breathability' that helps moisture to be regulated as well as a material density suffice to add a degree of decrement delay that will be useful for all those hotter summer days ahead of us in the south of England.

Worth pointing out is that manufacturers tend to market wall or roof 'systems' that include the insulation as well as other elemental components. The advantage of considering the use of these is that the construction types have already been 'tried and tested'.


credit: A great self-build blog: https://devonpassivehouse.wordpress.com/author/devonpassivehouse/



Manufacturing processes

'Wet' process


'Dry' process




A typical timber frame with timber cladding


Wood fibre insulation slabs applied to the outside of a Cross Laminated Timber (CLT) structure


Solid brick or Clay block walling with insulation applied to the face of the masonry


This roof application combines both flexible and rigid wood fibre