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Categorised grades in the perception of vibration immissions in dwellings 1 Borderline between frequency of hearing threshold and infrasound 2 Borderline between perceptible and non-perceptible vibrations 3 Borderline between disturbing and undisturbing structureborne sound immissions I Vibrations not perceptible, structure-borne sound radiated by wall or floor - not audible IIa Vibrations not perceptible, structure-borne sound radiated by wall or floor - not audible or not disturbing IIb Vibrations not perceptible, structure-borne sound radiated by wall or floor - disturbing III Vibrations perceptible, structure-borne sound radiated by wall or floor - strongly disturbing IV Vibrations perceptible, infrasound immissions possible

Categorised grades in the perception of vibration immissions in dwellings
1 Borderline between frequency of hearing threshold and
infrasound
2 Borderline between perceptible and non-perceptible
vibrations
3 Borderline between disturbing and undisturbing structureborne
sound immissions
I Vibrations not perceptible, structure-borne sound radiated
by wall or floor - not audible
IIa Vibrations not perceptible, structure-borne sound
radiated by wall or floor - not audible or not disturbing
IIb Vibrations not perceptible, structure-borne sound radiated by wall or floor - disturbing
III Vibrations perceptible, structure-borne sound radiated by wall or floor - strongly disturbing
IV Vibrations perceptible, infrasound immissions possible