The Benefits

If you are seeking a build method that is energy efficient, simple to use, fast to construct, and cost-effective then British-manufactured Ecobrix insulated concrete form (ICF) units are the solution you are looking for.

Ecobrix wall form units are made of woodcrete – recycled wood mixed with cement. This results in a form of fossilised wood, as strong as conventional blockwork but with the thermal efficiency of timber. Polyurethane insulation incorporated within each wall form unit further enhances the thermal performance.

The hollow units are dry stacked together on site to form walls. Since they simply lock together, assembling the units is quick and easy. Once assembled the units are filled with ready-mix concrete. A low-slump concrete mix can be poured at temperatures that would halt conventional brick and block laying. When the concrete has set, the wall form provides exceptional levels of insulation and airtightness.

Ecobrix can save you up to 30% compared to the cost of traditional brick and block masonry.

Building with Ecobrix woodcrete ICF offers a range of unique benefits and meets all upcoming and future regulations and recommendations for sustainable building construction. Click here to find out more about the specific benefits.

Durisol woodcrete ICF blocks offer a variety of benefits for your build project:

  • Up to 30% cheaper than traditional build
  • British manufactured
  • Minimal lead times
  • Quick and easy to construct
  • Exceeds Building Control requirements
  • Low u values
  • Average PSI values in the range of 0.04 – 0.08
  • Fire tested to 90 minutes at 1100oC to BS476: Pt 20: 1987
  • Low energy manufacture
  • Made from 80% recycled wood
Woodcrete ICF alternative to polystyrene ICF

British Manufactured

Durisol woodcrete wall form units are manufactured at our factory in South Wales. Manufacturing in the UK gives us complete control of the production process and ensures we maintain our high consistency standards. Not being dependent on supplies from overseas means we can meet production demand with minimal lead time as well as maintaining a level pricing structure not affected by fluctuating currency exchange rates.

If you would like to see the Durisol wall form units in production you are welcome to visit the factory for a prearranged visit.


Durisol thermal bridging PSI values are better than accredited details and all Durisol wall form units have been fire tested to 240 minutes @1100ºC to BS476: Pt 20:1987.

Durisol is accredited by the BBA and technically approved by LABC.

Fire Resistance

Durisol woodcrete wall form units have attained European levels of fire resistance, which are considerably higher than the UK regulations. Durisol woodcrete will not burn or rot due to the mineralisation process during its manufacture. Durisol has a 90-minute certified fire rating but has been tested to four hours.

Acoustic Performance

The considerable concrete mass in a Durisol wall system when used in conjunction with appropriate finishes provides an excellent reduction in sound transmission.

Ease of Construction

One of the principal benefits of the Durisol system is the ease of construction. It’s a simple to use build system, which can be managed by both experienced contractors as well as first-time self-builders.

The woodcrete wall form units are dry-stacked directly onto the foundation. The units stack together to quickly form your building, ready for the concrete pour. The concrete is firstly poured up to damp proof course and then the build continues. Propping is not required as the weight of the blocks provides stability during the build.

Durisol woodcrete ICF can be constructed in all weather conditions.

Chasing for electrics and plumbing is easy and fast. This can be done with either a wall chaser or a powered circular saw. All flooring systems can be used with Durisol and most external finishes can be applied including render, brick, brick render, timber cladding and rain screen cladding.

We offer free training days, allowing you to learn how to build with Durisol and get face to face demonstrations, examples and assistance. Click here to find out when our next training days are.


Durisol woodcrete ICF wall form units are a truly green and healthy product. Our environmentally friendly ICF forms use recycled material, softwood aggregates that are by-products of the timber industry.

In terms of resource depletion and carbon costs, our net cost is approaching neutral. Whilst cement is used during production and in the construction of the walls, there are various compensating factors which reduce our carbon count to below most traditional methods of construction.

  • An average 3-bed semi-detached house built from Durisol will have 10 tonnes of recycled wood in the product. This wood is made up of old pallets and offcuts which would have been destined for landfill and consequently would have released carbon back into the atmosphere.
  • Once the waste wood is mineralised and encased in cement, it won’t rot or burn. In effect, the embedded carbon is permanently captured and locked in.
  • Durisol wall form units are manufactured by moulding onto the factory floor and they then set at room temperature – there is no requirement for extra energy to warm the units.

Benefits of woodcrete ICF. Supply of recycled wood fibre used in Insulated Concrete Form

Thermal Efficiency

Durisol wall form units are designed so that the insulation is external to the concrete core and wraps around the full envelope of the wall. The thermal mass effect from this insulation results in reduced heating costs as the energy/heat in the wall is transferred back into the cooler air.

Foam ICFs are less effective as they have 50% of the insulation on the interior face, which reduces the net benefit that is obtained through the effects of thermal mass.

The U values and PSI values that can be achieved through building with Durisol exceed UK building regulation requirements and surpass traditional cavity and timber frame construction values:

  • U values – Durisol walls have low u values without additional insulation. They can easily be reduced further by an external cladding of extra insulation but this is only likely to be necessary if Passivhaus standards are required.
  • PSI values – Average PSI values in the range of 0.04 to 0.08 are typical depending on the design. SAP calculations are far more sensitive to the movement in PSI values compared to relatively large changes in wall, floor or roof U-values. With the products excellent junction PSI values it is possible to reduce the need for renewables.
  • Excellent airtightness results – High-performance level of airtightness in conjunction with final wall finishes.

For more information please click on the links to download the following documents: