system in these views the top chord 11 the bottom chord 13 and the web 15 are shown along with the tabs 14 a studs 14 7 8 u2033 hole 12 and u00bd u2033 hex head bolt 12 a note here the height h is also 18 u2033 and overall length of the top chord is 4 u2032 and overall length of the bottom cord is 40 u00bd u2033 dimensions may vary per structural calculations fig1 is a top plan view of one of the box bar joists bbj used in the foundation system here the top chord 11 is shown note that the corners 11 a are notched this is to facilitate the assembly as discussed below note here that the holes 12 and bolts 12 a are also shown adjacent to the studs 14 and tabs 14 a fig1 is a front elevation view of two box bar joists bbj used in the foundation system here two sections of bbj 10 are shown placed adjacent this is how the bbjs are aligned during the construction fig1 is a perspective detail section view of an alignment of four bbjs used in the foundation system in this view note how the holes 12 and the studs 14 are aligned note too that the notched corners 11 a come together to form a hole in.