The invention relates to a method for providing a fire safe penetration in a building element, especially in a ceiling, floor or in a lightweight wall comprising a framework of profile elements and at least one outer covering being fixed to said profile elements. For providing a fire safe penetration in a building element, for example a lightweight building wall, in such a manner that the building element or insert can be easily manufactured and installed while guaranteeing the high requirements of flame and smoke resistance of such a building element or the insert, the invention proposes the following consecutive steps: arranging an insert between the profile elements at a location for a pipe or conduit penetration in a way that the insert is arranged adjacently to the outer covering and is at least partly covered by the outer covering; providing an opening in the outer covering and the insert for a pipe or conduit; arranging the pipe or conduit through the outer covering and the insert and securing fire and/or smoke tightness between the pipe or conduit and the insert and/or outer covering.