[carole2cd]

Trying to install a top mount sink over a new tile countertop. The sink bows on 2 sides so it won't sit flush on the tile. There is a 1/4 inch gap

[speedball1]

the sink bows on 2 sides so it won't sit flush on the tile. There is a 1/4 inch gap

What do you mean, "the sink bows"? Is there a dip in the tile counter top? Is the cutout not correct? Are the tiles uneven? What? Cab you post a picture?
Cheers, Tom

[carole2cd]

The tile is even, checked with level, it is 24 inch tile. No dip in counter top and the cut out seems correct. The gap is on both sides of the sink between the tile and sink, the back and front sit flush. Also the clips are too short due because there is an inch layer of board under the new tile

[massplumber2008]

Hi Carole2cd:

You can drill out holes in the plywood underneath so the clips can grab properly. You don't want to remove all the plywood... just enough so the clips can grab and pull the sink down at the edges... see image.

You want to drill the holes or notch the holes so about 1/2 the hole crosses the plywood. This can be a bit of a pain, but should fix your issue. Let me know if you understand...

Mark