Isocell cellulose has a moisture-regulating effect. It is not only very water vapour permeable, it can also transport moisture in the fibre. It accomplishes this without losing its insulation qualities.
Moisture transport in the construction component works by diffusion, i.e. from warm to cold. Condensation occurs when the air temperature reaches the dew point.
Cellulose has a capillary conductivity, which means it absorbs any moisture that forms and thus acts against the direction of diffusion. As a result, cellulose becomes a valuable moisture buffer, especially if a drying out of the construction component is only possible on the room-side - such as, for example, in the case of unventilated flat roofs, interior insulation or renovation.
Isocell cellulose insulation does not accumulate mould itself and also protects adjacent parts.
Source: Dl. (FH) Michael Gomm, "Mould growth on wood and wood-work materials", diploma thesis at the University of Applied Sciences of Carinthia 2009