In positive pressure drying, the insulation is flooded with dry, heated air through special openings.
During the course of the flooding phase, the dry air becomes enriched with moisture from the insulation material, escapes via the edge joints or other relief openings into the room and is dried again by means of installed dehumidifying units.
Via this cycle, drying to the material-specific balanced humidity is achieved.
In the vacuum method, the entire procedure is reversed. The moist air is extracted from the insulation by means of vacuum turbines.
In this way, a vacuum is created in the insulation which causes air from the room, dried by dehumidifiers, to flow in via the opened edge joints or other relief openings to balance the pressure again.