spanning member 25 the cross web member 27 the inside spanning member 28 the inside clasping members 29 and the outside clasping members 33 are defined in the sheet metal 51 as shown by the primed reference numerals in fig7 the sheet metal 51 is then bent at substantially 90 degree angles as shown by the directional arrows 100 of fig7 along edges 53 of the defined rectangles thereby forming the three dimensional article 21 shown in fig2 through 6 the article 21 is thus comprised of planar sheet metal preferably of 20 to 18 gauge steel it will be appreciated by those skilled in the art that alternative sheet material and alternative thicknesses may also be suitable for use in the present invention the outside spanning member 25 has a length 55 fig4 and 5 sufficient to extend between the outer surfaces 35 of the rafters 23 fig3 similarly the cross web member 27 and the inside spanning member 28 have a length 57 fig4 and 5 sufficient to abut the inner surfaces 31 of the rafters 23 fig3 the inside clasping members 29 as well as the outside clasping members 33 are of dimensions sufficient to resist lateral flexion of the rafters the holes 37a are located within the planar surfaces of the article such that fasteners inserted through the holes 37 enter the beams 23 at locations which are not aligned with the locations of fasteners inserted into the holes 37b fig8 and 9 depict an alternative embodiment of the present invention a piece of sheet metal 151 has been divided into rectangular areas 125 39 127 39.