[raveon]

I noticed the undermount kitchen sink has come loose againt the granite countertop. I'm attaching some picture that show the problem. You can see a gap forming. I am not sure if it is silicone caulk failure from normal wear/tear and/or the builder did not apply any silicon caulk to "glue up" the sink/countertop edge. Maybe they just put silicon caulk around the perimeter. Watching youtube videos on undermount kitchen sink installation, I see all tutorials applying a lot of silicon caulk, then forming a tight seal, and then removing the excess caulk that has oozed out.

I have contacted the builder to see if they can remount the sink properly. If they agree to do it, great.

If not, what would be the procecure to correct this problem? Should I just tighten one of the screws to close the gap and recaulk the perimeter or do I need ot caulk all top edges of the sink and clamp it to the countertop. I notice instead of using mounting clips, the builder put some pine board to support the weight? In such a scenario maybe gluing/sealing it to the countertop is unnecessary? I am not sure.

Thanks for any ideas.

 

[chandler48]

I see the screws are loose, could that be a problem? All the installers we use normally use an adhesive under the rim (pixie dust and spit, possibly ) and attach their support lumber to the sides of the cabinet once the sink is jacked into place firmly. Vertical screws can't be used well in stone countertops.

 

[raveon]

I see the screws are loose, could that be a problem? All the installers we use normally use an adhesive under the rim (pixie dust and spit, possibly ) and attach their support lumber to the sides of the cabinet once the sink is jacked into place firmly. Vertical screws can't be used well in stone countertops.

Thank you for the reponse. I notice all 4 screws are protruding from the lumber at about the same distance. I will try to tighten and see.

 

[raveon]

I was able to fix this on my own. I got lucky. The original installer used the EZ Sink installation hardware (ez sink installation hardware - Google Search). So I just unscrewed it enough to lower the sink, clean out all the old caulk on the sink/under the granite, wipe it down with acetone, and then apply a thick fresh 100% silicone bead and tighten the screws to reclamp it. It looks just as good as new.

A shady contractor quoted me $1100 for the fix.....