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See photos of tread thicknesses here.
Cove is an important part of the structure of the stairs. Like a glue block, the cove supports the tread and riser joinery. If no cove is selected, this requires additional measures underneath the stair to ensure proper strength and stability.
Upgrade to a waterfall stair — a term that refers to the tread nose being flush with the riser. This labor-intensive style requires the talents of highly skilled craftsmen.