Bio-insulation from sawmill offcuts (conifers). The only material able to offer excellent winter insulation combined with unrivalled summer thermal lag.
Thermal inertia principle. The wood fibre panel accumulates solar heat during the day without overheating immediately, releasing it only many hours later when outside temperatures have dropped.
Wood fibre is not just an insulator: it is an active thermal mass. By using the natural hygroscopic and thermodynamic properties of wood, this material transforms the building envelope into a breathing lung capable of managing comfort in both summer and winter.
The wet process exploits the natural lignin contained in wood to bind the fibres without synthetic glues; the resulting panels are stiffer and denser (up to 270 kg/m3). The dry process uses a minimal percentage of resins or polyolefin fibres for lighter, more flexible panels. In both cases, the material is a carbon sink: during its life, the tree has absorbed more CO2 than is emitted to produce the panel.
Wood fibre has a very high specific heat capacity (2100 J/kgK): it accumulates the sun's heat without immediately overheating. Thanks to this lag (often > 12 hours), the afternoon heat peak reaches the interior only at night, when it can be dissipated with natural ventilation. Furthermore, wood fibre (mu = 3-5) lets vapour pass through, regulating indoor humidity.
European and international references applicable.
Wood fibre is combustible (Class E): on facades above 10 metres, regulations may require a mineral render (lime-silicate) or a rock wool fire barrier strip at each floor level before it can be certified.
Rigid tongue-and-groove panels laid over timber rafters to eliminate summer overheating in attic rooms.
PRC.04 · Open the processBreathable external insulation for nZEB buildings, compatible with silicate or lime render systems.
PRC.01 · Open the processFlexible panels (FLEX) press-fitted between timber or drywall studs for thermoacoustic comfort.
PRC.07 · Open the processHigh mechanical resistance panels used as base for floating or underfloor heating systems.
PRC.31 · Open the processThermal lag indicates the time for a heat wave to cross the insulation. A value > 12h (achieved with 20cm wood fibre) ensures the midday solar heat enters at midnight, when natural ventilation can cool the building. This is the key reason wood fibre is preferred in Mediterranean climates.
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