The standard building code for ordinary block works requires a stabilizing beam every 3 meters or so. The reason is that the blocks are only 200mm wide and have no inherent ability to be interlocked.Since they are bound together by mortar which can crack and de-bond due to settling, the builder should put a 200mm x 200mm beam with reinforcement bar.
The interlocking type of block is wider and also is keyed every 250mm along its whole length in both x and y directions. Any settling of the wall base would not be sufficient enough to cause the wall to buckle.
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