Abstract: The present loading grid assembly includes a plurality of support bars which are held together by assembly support rods which lie orthogonal thereto. The assembly support rods are terminated in end blocks which have grooves formed therein and which are formed to be substantially symmetrical about the assemby support rods. Accordingly, the assembly can be turned over so that any sag which results from a load is reversed thereby providing wear on the upper and lower sides of the assembly. In addition, the present device includes post guides, spacer blocks, stacking posts and interlocking members. The post guides fit into the grooves of the end blocks and into grooves of the stacking posts to provide a support means for a second tier of support bars. The spacer blocks fit over the assembly support rods to define a changeable separation between adjacent support bars while the interlocking members securely separate adjacent bars and provide further vertical support to an assembly.