key Joint is used in the joints between slabs to prevent any vertical movement between each slab - meaning that it stops either slab from lifting.
It achieves this by creating a large tongue and groove type arrangement between each slab due to the shape of the keyjoint
keyjoint is available with removable or non removable capping of various types to allow for sealed expansion joints - the removable type is what they called a zipped capper due to the fact that it can be pulled out after the slab is cured, much like the undoing of a zipper
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