Method in the manufacture of mineral fibres, in which method - mineral melt is led to a first rotating fiberising rotor in a fiberising apparatus comprising at least two fiberising rotors, - mineral melt is thrown from the mantle surface of the first rotating rotor to the mantle surface of a second rotating rotor, and from there successively to the mantle surfaces of possible following rotors, - mineral melt is formed to mineral fibres at the active peripheries of the rotating rotors, - the mineral fibres formed are blown off from the fiberising rotors of the fiberising apparatus towards a collecting member by means of fibre blow-off means arranged at the active peripheries of the rotors, whereby the active periphery of the at least one of the fiberising rotors is divided into at least a first section and a second section, - binder is applied to the mineral fibres during their formation by means of a binder applying members arranged at the active peripheries of the rotors, characterised in that - the active peripheries of all fiberising rotors in a fiberising apparatus are divided into at least two sections, - the fibre blow-off means at the first section are controlled independently of the fibre blow-off means at the second section, whereby the fibre blow-off means at the first section blows off mineral fibres towards a first location on a fibre collecting member, and the fibre blow-off means at the second section blows off mineral fibres towards a second location on a collecting member, and - the fibre blow-off means blows off mineral fibres at the first section at a first velocity, and at the second section at a second velocity. - mineral melt is led to a first rotating fiberising rotor in a fiberising apparatus comprising at least two fiberising rotors, - mineral melt is thrown from the mantle surface of the first rotating rotor to the mantle surface of a second rotating rotor, and from there successively to the mantle surfaces of possible following rotors, - mineral melt is formed to mineral fibres at the active peripheries of the rotating rotors, - the mineral fibres formed are blown off from the fiberising rotors of the fiberising apparatus towards a collecting member by means of fibre blow-off means arranged at the active peripheries of the rotors, whereby the active periphery of the at least one of the fiberising rotors is divided into at least a first section and a second section, - binder is applied to the mineral fibres during their formation by means of a binder applying members arranged at the active peripheries of the rotors, - the active peripheries of all fiberising rotors in a fiberising apparatus are divided into at least two sections, - the fibre blow-off means at the first section are controlled independently of the fibre blow-off means at the second section, whereby the fibre blow-off means at the first section blows off mineral fibres towards a first location on a fibre collecting member, and the fibre blow-off means at the second section blows off mineral fibres towards a second location on a collecting member, and - the fibre blow-off means blows off mineral fibres at the first section at a first velocity, and at the second section at a second velocity.