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Octagon Interlock: Our unique design for interlocking our blocs using a high and low interlock in an octagon shape with the plus on top means that there is no movement of the bloc and creates a seamless joint between the courses improving the thermal properties of a Sunbloc wall. Alot of other insulating concrete formwork systems have one of these but not all of them, this means Sunbloc will give much less wall wobble which reduced any chance of problems during the concrete pour. 

A staggered male and female interlock on the ends of each bloc stop the blocks from moving apart along the wall, when combined with the staggered coursing this means the wall is incredibly stable and far easier to maintain a straight wall. It also reduces the risk of a blow out when pouring the concrete.