The present invention relates to a method for installation of a rock bolt (124) in a first drill hole by means of a rock bolting rig (100), wherein said rock bolting rig (100) comprises a carrier (101), a boom unit (102) fastened to said carrier (101), and a bolt unit (103) fastened to said boom unit (102) via first joint means (106), wherein said bolt unit (103) comprises a feeder unit (104) including means for displaceable carrying of a drilling machine (105), wherein said bolt unit comprises a first (103A) end and holding means (123, 125) for holding said rock bolt (124). The method comprises: —by means of said first joint means (106) maneuver said first end (103A) of said bolt unit (103) to a first position for loading of a bolt, —when said bolt unit (103) has been maneuvered to said first position for loading of a bolt, providing a rock bolt (124) to said bolt unit (103), for being held by means of said holding means (123, 125), and —when said bolt unit (103) has been loaded with said rock bolt (124), maneuver said bolt unit (103) to a position for installation of said rock bolt (124) and loaded with said rock bolt (124) drilling said first hole and installing said rock bolt (124) in said first hole. The invention also relates to a rock bolting rig.