A truss mounting brace (1) for use during installation of trusses (19, 21, 22). The truss mounting brace (1) may also be used as a permanent spacer between two trusses (19, 21, 22). The truss mounting brace (1) comprises a mounting section (4) arranged to be mounted on a truss (19, 21, 22), a gripping section (3) and an oblong body section (5) connecting the mounting section (4) and the gripping section (3). The gripping section (3) has a gripping mechanism (6) arranged to receive and to engage another element interlockingly. The present invention also relates to a method of installing two or more trusses, use of the truss mounting brace, and a method of manufacturing the truss mounting brace.