The Material

Durisol insulated concrete form (ICF) wall units are formed from woodcrete – cement-bonded wood fibre material.

The specially graded recycled waste wood is initially chipped into wood fibre and then mineralised to neutralise the natural sugars. After mineralisation, the wood chips are bonded together with  Cem 1 cement. Recycled Durisol wall form units are also used as part of the mixing process, as it acts as a filler.

Limestone grit is added to the mix for internal wall units, as it helps with acoustic properties.

The cement-bonded wood fibre mix is then moulded and stamped out to form the many shapes that comprise the full range of Durisol wall form units. Once the Durisol units have been produced, external wall units are filled with PIR insulation.

Properties of Insulated Concrete Form (ICF)

Durisol cement-bonded wood fibre insulated concrete forms are porous, lightweight and very durable. They do not rot nor decay. Our insulated concrete forms are also vermin and insect proof and will not support fungus growth.

Durisol ICF forms are environmentally safe, do not contain nor emit any toxic elements, and are fully recyclable. They contain no plastic, foams or polystyrenes.

Durisol wood concrete insulated forms are truly a green and healthy product. 90% of our Insulated Concrete Form (ICF) blocks are made from recycled material, softwood aggregates which are by-products of the timber industry.


Developed in Belgium in 1937, Durisol has been used for thousands of builds internationally and in the UK, including large scale projects such as hostels up to 26 storeys.  Durisol products are manufactured in the UK. To learn more about our manufacturing process click here. To view projects that have been completed using Durisol, click here.

The Range

View our range of brick alternatives.