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It is required that the stair tread, riser and stair nose should be clean, dry and structurally sound.  The stair nose return should be rounded 3/4 to 1 inch (19 to 25 mm) to prevent sharp stair edges from cutting carpet and/or cushion, and to provide proper carpet contact for adhesive installations.  When carpet is installed over a separate cushion, extend the cushion over the stair nose.