To use - place a 9mm plywood sheet and a 6mm fibre cement board on top of the cabinets carcass. The cement boards should be cut flush to the edge of the cabinets. The forms will then be screwed into the cement board with 12mm x 10g Panhead screws. After the concrete is poured, the forms are snapped off along the designated 'breakpoint' to reveal a beautiful clean edge.

Concrete benchtops that are made with rebar that is too large in scale for the slab thickness are susceptible to telegraph cracking.

When concrete shrinks due to drying out, high tensile stress levels develop around proportionally oversized reinforcing. These stresses cause cracks that run along the length of the steel. Smaller diameter reinforcing has less of an effect on the concrete, so the same amount of concrete shrinkage develops much less tensile forces, thus the likelihood of cracks caused by the steel itself drops dramatically.

Because all concrete shrinks to some degree and shrinkage occur over a long period of time, the occurrence of telegraph cracking may not appear until long after a countertop is installed.

Our recommendation is use a fibreglass based composite scrim or bar instead to prevent rust issues, ghosting and telegraph cracking.