Wood Wool Cement Board
Wood Wool Cement Board (WWCB) is a versatile building material made from wood wool (excelsior) and cement. The world wide acceptance of WWCB proves its versatility in applications and its durability in any climatic condition.
The main characteristics are:
- Fire resistance
- Wet and dry rot resistance
- Freeze-thaw resistance
- Termite and vermin resistance
- Thermal insulation, providing energy savings
- Acoustic performance - sound absorption
- Acceptance of a wide range of finishes
A major application of WWCB in developing countries is durable, energy efficient Economic Housing.
WWCB has been tested and classified B1 (fire resistant) according to the German DIN 4102 standard.
Wet and dry rot resistance
Because the wood wool has been mineralized by the cement, moisture loses its effect on the board. The boards are used for interior and exterior applications and in moist conditions such as ceilings in indoor swimming pools
Termite and vermin resistance
Tests have proven that WWCB is not vulnerable to attack by termites or vermin, nor is WWCB subject to any biological decay.
Because of its relatively low density, WWCB has good thermal properties. The maximum thermal conductivity for boards of 25 mm thickness is 0.090 W/mK.
For 2- or 3-layer composite panels, the thermal conductivity will be further reduced, when a core of respectively rigid foam (e.g. polystyrene) or mineral fiber has been applied.
Unfinished (or spray-painted) WWCB has very good acoustic absorption properties since the open surface structure allows for a high level of sound absorption.
Wood Wool Cement Board accepts all kinds of conventional rendering, plastering, decorative materials and mastics. Acoustic ceilings can be spray- or roll-painted while retaining its acoustic properties.
The following Wood Wool Cement Boards are common:
- Standard WWCB
- Fine-fibre Acoustic and Decorative WWCB
- Composite WWCB (sandwich boards with a core sheet of Styrofoam, PU foam, Rockwool, or other insulating material)
- Reinforced Roofing WWCB
Standard dimensions and density of WWCB
Length: 2400 mm, optionally up to 3000 mm (optionally cut into 600 or 1200 mm length, e.g. for acoustic ceiling panels)
Width: 600 mm
Thickness: 15mm, 25mm, 35mm, 50mm, 75mm, 100mm
|15 mm||570 kg/m³|
|25 mm||460 kg/m³|
|35 mm||415 kg/m³|
|50 mm||390 kg/m³|
|75 mm||375 kg/m³|
|100 mm||360 kg/m³|