This material is used between floors as an insulator against sound.
It is, without any exception, the cleanest and most effective
sound-deadening felt made. The corrugations make small dead air cells
when the felt is placed in position and this is considered to be the
most effective method of deadening sound. Tests have proved that one
sheet of Florian is equal to six sheets of ordinary deadening felt.
Florian is also a good non-conductor of fire, heat and cold. It should
be used between floors in every house to insure a well insulated
building.