Durisol is a proprietary cement bonded wood fibre material. It is composed of specially graded recycled waste wood (100% clean, natural softwood lumber), that is neutralized and mineralized, and then bonded together with Portland cement. Hardened Durisol is lightweight, porous and very durable. It does not rot nor decay. It is vermin, termite and insect proof and does not support fungus growth. Durisol is environmentally safe, does not contain nor emit any toxic elements, and is fully recyclable.

Durisol products have been installed throughout Europe, North America, Asia and Africa for over fifty years. They have withstood hot and humid climates, disasters (fire, bombs, hurricanes, earthquakes), freezing and thawing - all without loss of performance or damage.
Durisol walls provide exceptional insulation and this translates to significant ongoing savings to building owners and increased comfort to the people who live and work in Durisol buildings. The Durisol wall system can provide effective thermal performance values that are more than twice that of conventional walls. The benefits of thermal mass are increased through the use of Durisol Wall Forms since the majority of the insulation is located on the exterior of the concrete core (still within the Wall Form unit). This, unlike foam concrete forms that have 50% of the insulation on the interior face, increases the net benefit that is obtained through the effects of thermal mass.
Sound absorptive properties of Durisol in combination with the mass of the wall system provides an ideal combination of sound absorption & sound transmission properties. Wall Sound Transmission Coefficient (STC) ratings can range between 54 & 72, while the Durisol material itself provides Noise Reduction Coefficients (NRC) ratings as high as 0.95. This means that 95% of the sound that reaches the Durisol material is absorbed and not reflected back into the airspace.
The cement content of the Durisol material creates an above average pH environment at the wall surface , that inhibits the growth of fungi and mould. Furthermore, the hygroscopic nature of the material moderates relative humidity levels (65% RH maximum) and provides an inherent moisture regulator that keeps humidity levels low.
The Durisol Wall Forming System is a straight-forward method of building a reinforced concrete wall with built-in thermal, acoustical and fire protection. The wall forms are interlocking modular units that are dry stacked (without mortar) and filled with concrete and reinforcing steel.

The Wall Form units are available in a variety of widths and insulation configurations that create a system that is flexible, design friendly and optimized for each specific application (above-ground, below-ground, commercial, residential, etc.).
Builders choose Durisol because of the ease with which walls can be constructed. The Durisol material is light-weight (no block exceeds 18kg), easily cut, nailed and screwed with simple carpentry tools.
The unique free-draining Durisol material allows the use of high-slump
concrete in the field that makes for easier and faster concrete pouring that ensures a solid wall without any compromise in strength. Ideally, concrete with a slump between 180mm & 220mm is recommended for use in conjunction with Durisol.

The Durisol material is considerably stronger than other ICF materials. Even with high-slump concrete, Durisol Wall Forms never blow-out during concrete pouring (when following requirements in our technical guide). Additional bracing is only required when the Wall Form units have been cut or altered on-site. Interior and exterior finishes are applied directly to the Durisol material, eliminating subsequent steps in the construction process. Drywall can be attached anywhere on the Wall Form surface, while the open-textured nature of the hardened Durisol makes it ideal substrate for plasters and stucco.

Durisol's American website provides further details:
Durisol International