Spacer for the fastening of an object to a base having an insulation layer comprising - a contact surface which can be brought to abut against the base - a rod element which can be anchored in the base - a fastening means for the detachable fastening of the object on the spacer, - a bridging element which thermally separates the rod element and the fastening means, on which the rod element and the fastening means are detachably anchored, wherein the bridging element in the form of a cylindrical body is delimited by a base surface, a top surface parallel to the base surface and a lateral surface, - wherein at least one internal thread is disposed in the bridging element, and wherein the bridging element has an access opening in the base surface and an access opening in the top surface, - wherein the rod element is provided at least in part with an external thread, and wherein the rod element can be screwed via the access opening in the top surface into the at least one internal thread, - wherein the fastening means with an external thread can be screwed via the access opening in the base surface into the at least one internal thread, - wherein an end adapter can be fastened to the fastening means at variable distance from the base surface, which end adapter is configured for closing a cavity which accommodates the spacer in the insulation layer, characterized in that - between the base and top surface of the bridging element there extends at least one continuous groove, which is open towards the lateral surface, for introduction of an insulating material and - the end adapter has at least one through opening for the supply of the insulating material. - a contact surface which can be brought to abut against the base - a rod element which can be anchored in the base - a fastening means for the detachable fastening of the object on the spacer, - a bridging element which thermally separates the rod element and the fastening means, on which the rod element and the fastening means are detachably anchored, wherein the bridging element in the form of a cylindrical body is delimited by a base surface, a top surface parallel to the base surface and a lateral surface, - wherein at least one internal thread is disposed in the bridging element, and wherein the bridging element has an access opening in the base surface and an access opening in the top surface, - wherein the rod element is provided at least in part with an external thread, and wherein the rod element can be screwed via the access opening in the top surface into the at least one internal thread, - wherein the fastening means with an external thread can be screwed via the access opening in the base surface into the at least one internal thread, - wherein an end adapter can be fastened to the fastening means at variable distance from the base surface, which end adapter is configured for closing a cavity which accommodates the spacer in the insulation layer, characterized in that - between the base and top surface of the bridging element there extends at least one continuous groove, which is open towards the lateral surface, for introduction of an insulating material and - the end adapter has at least one through opening for the supply of the insulating material.