are provided with caps 46 to prevent grout from pouring into such voids this method of assembly provides a horizontal and a vertical reinforcement to the structure the number of passageways being used to allow reinforcing rods and grout in any given construction will be determined by the calculations made by structural engineers fig1 to 18 illustrate another embodiment of an insulating core 112 all of the numerals corresponding to similar components in the embodiment described in fig1 to 10 have been raised by 100 referring now to fig1 and 12 the insulating core 112 is shown having a front or outside wall defining the surface 120 while a plane 122 delimits the top wall surface the front wall is identical to the wall defining the wall surface 20 of the insulating core 12 shown in fig3 to 7 a pair of projections 160 and 162 extends at right angles to the rear of the wall the projections 160 and 162 are identical and each defines a male member 136 a and 136 c with portions of the inside wall in plane 118 being defined by the ends of the projections 160 and 162 the face shells 114 and 116 are the same as the face shells 14 and 16 shown fig2 fig1 to 17 show a partially assembled wall made up of blocks 110 as shown in fig1 outside cladding made up of individual face shells 114 are engaged on the male members 136 a 136 b and 136 c of outside wall surface 120 defined by the base likewise face shells 116 engage male members 136 a and.