The main advantages of grabo Vaporex products:

Provide continuous stabile and damp-proof base
Cut down installation time
Allow that a new temporary floor can be laid over an existing floor without removing the old gluing

Typical areas where graboVaporex underlays are recommended to use:

on cement/concrete bases where construction moisture has not dried out properly, between 2-5 CM% (Carbide method)
on old subfloors which do not contain a proper damp proof membrane
over old, soundly fixed floorings when a temporary covering is planned to use without gluing

graboVaporex should NOT be used:

on areas that are subjected heavy wheeled traffic, forklifts etc.
on timber-bases that are not well ventilated
on subfloors that are subjected hydrostatic pressure,
on subfloors which contain an effective damp proof membrane but exceed a relative humidity of 97%, and on subfloors having no damp proof membrane and the relative humidity above 92 %,
on magnesite estrich