washers disposed at each end thereof may be utilized with blocks having a 34 l 34 shaped like cross section frequently used in corner constructions if desired a pair of plates equipped with camming plates may be disposed within one block such that the block is provided having a pair of 34 t 34 shaped slots having their crossbars shaped disposed in adjacent to one another and having their legs extending in opposite directions such a block may be utilized intermediate a pair of blocks wherein such pair of blocks are provided having a 34 t 34 shaped slot disposed in only one lateral face thereof the same tie rods may be utilized to join together three of such blocks into a three tiered wall block having an outermost block an innermost block and an intermediate block obviously if desired more than three blocks may be utilized so as to form a wall construction having as many blocks as required because of the structural nature of the plate apparatus adding strength to the cementuous material comprising the building block such cementuous material may be fabricated from materials whose strength need not be as great as unsupported blocks additionally the choice of proper materials tending to minimize weight can also be utilized so as to enhance the thermal insulating capabilities of the block we have discovered that a good composite block may be fabricated from conventional cementuous materials having as much.