hollow interiors of the bond beam accommodating blocks to their lower faces through these apertures the longer vertically oriented limb 30 fig9 of the downwardly extending brackets can enter the perpends of the course below the bond beam 5 the upwardly extending brackets 24 can pass directly from the bond beam 5 into the perpends of the course above in both cases the shorter limbs 32 of the brackets 24 extend generally horizontally in the concrete of the bond beam to tie the brackets and thereby the adjacent blockwork courses to the bond beam both limbs 30 32 of the brackets 24 may contain apertures 34 or other formations that help the bracket to key into the surrounding concrete mortar or the like although the brackets are shown extending into the perpends they may instead be grouted into apertures formed in the blocks of the adjacent courses the construction shown contains no additional reinforcement apart from the rebars 14 and brackets 24 bed joint reinforcing mesh is not used at least in the courses above and below the or each bond beam which are tied into the bond beam course by the brackets 24 fig1 shows a closure plate 36 having a pair of holes 37 by which it can be slipped over the cleat pockets 12 after the cleat 16 has been secured to its stanchion e g using bolts passing through securing holes 23 into similar holes in the stanchion or into a channel 17 such as shown in fig6 a the closure plate is made of a resiliently deformable material and is of sufficient size to seat and seal against the exposed end face of the adjacent block containing the bond beam the closure plate seals around all three.