Abstract: A structural member spacing tool is adapted to be disposed between adjacent structural members for positioning the structural members a predetermined distance apart. The tool acts as a support to prevent movement of the structural members while they are fastened in place. The tool is provided with parallel, spaced apart support surfaces which provide rigid support within a stud cavity between adjacent stud members. This allows the tool to prevent movement of the studs while they are fastened in place. Since the tool is disposed within the stud cavity, it can be utilized in any stud cavity including the cavity adjacent a corner. The tool can also be used for walls adapted to be constructed flush against a masonry wall.