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I know there was a discussion a while back but I can't find which post it was under.
Could this be it?
http://www.savewright.org/talk/viewtopi ... ght=blocks
There's a reason why nobody makes these blocks, instruction is hard to find and the technology didn't catch on among architects and builders: in terms of construction costs and maintenance, it was a disaster.
A conventional masonry wall has mortar joints all around the block unit which enable the constructor to make minute adjustments to the plumb, level, and square of the wall is it rises. With Wright's system, the blocks join on all sides directly with adjacent blocks. Any imperfection on a block edge or indeed the shape of the unit itself, will start to multiply as construction continues. I found what appeared to be toothpicks and other small shim materials embedded at various locations in the Pieper walls, apparently to enable blocks to meet precisely to provide a good clean line and a good seal for the grouting of the block's edge channels.
I also noted when looking in end sections of walls where doors and windows had been removed, that the grout sometimes did not flow evenly and left steel bars exposed to moisture (what little there was in Phoenix).
The system was elegant in appearance and principle, but it seems to have been tedious to construct.