Are there industry standards for flush Granite sink cutouts?


Flush Sinks in Granite Top - Granite counter top sink cutouts are not as I ordered. I ordered the sink cutouts on counter tops made for our kitchen to be made FLUSH with the sink bowls.The sink manufacturer specified this on the prep sink cutout for accessories but not on the two bowl sink. I ordered the two bowl to be flush as well to match.They had both sinks in house and I provided them detailed drawings for reference.The tops were delivered with a 3/16 reveal on both sinks. The fabricator claims they are both to industry standards and refused to replace them. They say my directions were not writen into the contract so I should take them the way they are or take them to court. Do I have a legitimate gripe here or am I stuck with tops? Where could I acquire a copy of "industry standards"for the granite counter top industry? I tried the local BBB and NARI. They could not help.


ANSWER - The Marble Institute of America (MIA) Design Manual does not discuss flush mounted sinks.  It is more common to have a reveal and not common to flush mount sinks.  I would be concerned about the transition joint between the slab and sink and I would make sure it is properly treated with an appropriate sealant (caulking) as it would tend to be a point of failure that could lead to water intrusion under the cabinet.

If the sink specifications were clearly communicated as being flush mounted then it should have been installed that way.

The MIA website is at if you want to check with them.

Good Luck!

2 thoughts on “Are there industry standards for flush Granite sink cutouts?

    • Donato Pompo says:

      The industry standards as stated by the Natural Stone Institute provides details on several methods of mounting sinks depending on whether they are top mounted or undermounted.

      Undermount sinks can be anchored to the underside of the stone countertop or supported by a subtop or auxiliary framing. A 2×4 support would be considered auxiliary framing, which is preferred or necessary when stones of lesser soundness are used, or when the sink is excessively heavy when loaded with contents.

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