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Craftsmen Specification 12 solves the problem of topping slab curling and eliminates excessive cracking . Shaw & Sons not only invented the most popular concrete doweling system but also the answer to get rid of common problems in topping slab applications . This proven design uses typical checkerboard or strip pour methods and subsequently conforms L-shape panels that secure one end to the existing sub-slab and floats the other end by Fas Dowel TM doweling horizontally into the next panel . This secures one end to the sub-slab vertically with an epoxied dowel and the other end horizontally with a slip dowel into the next panel .