in fig9 and 10 each floor slab 38 has a connection box 180 fixed in place at a plurality of locations along each end edge of the floor slab the connection box 180 may be a section of a standard 4 u00d7 4 u00d7 1 4 inch hollow structural tube with a base plate 182 connected across one end of the tube section two of the sides of each connection box are welded or otherwise suitably attached to the adjacent ends of a u shaped rod 184 the rod 184 is cast integrally in the floor slab 38 the outer sidewall 186 of each connection box has a slotted hole 188 as best illustrated in fig1 washers 190 are placed on the inside of each connection box and a threaded bolt 192 and nut 194 are used to connect the two connection boxes and the adjacent floor slabs 38 as illustrated as illustrated in fig9 a thin layer of grout 196 is preferably placed between the walls 190 of the connection boxes and a small diameter polystyrene rod 198 is used to retain the grout in position while it is setting up fig1 is a plan view showing how insulation 110 is placed between two adjacent party walls 36 in combination with a polystyrene rod 200 and polypropelene caulking 202 this insulation runs the full height of each module and the town house living unit.