ProBlock is a patented concrete masonry unit developed and marketed by Johnson Concrete Company. It is the final result of close collaboration between Johnson Concrete’s engineers and production team, block masons and architects. The design’s genesis dates back to October 2010 when Johnson Concrete hosted a meeting which included masons and architects to discuss the future of concrete masonry and what block producers could do to improve the market. The first attempts by Johnson Concrete to create a new concrete masonry unit to address these issues met with marginal success. When the ASTM C90 standard changed from requiring 2.25 in/ft minimum equivalent web thickness to requiring 6.5 in2/ft2 normalized web area, Johnson Concrete saw an opportunity to develop a product that could change the masonry industry.