We can make a full top from the same material as the cabinet box. We can do this but we do not advertise it.
This really depends on the scenario but it is usually around 48" when the countertop needs extra support.
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It is attached to the wall with construction glue. (not provided)
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The black impact coating is $7.04 per inch. The maple butcher block is $9.01 per inch The laminate is $5.40 per inch