(1) General.-Solid floors in contact with the ground shall be a minimum thickness of 75 millimetres and shall be so constructed or treated as to render them damp-proof.

(2) Where required by the local authority, a horizontal damp-proof course shall be laid under the floor for its full extent.

(3) Wash-room and toilet-room floors.- The floors of wash—rooms and toilet-rooms shall be of tile, terazzo, granolithic and other impervious material, and have a skirting of impervious material of not less than 75 millimetres in height around the walls.