Where to caulk this kitchen sink (with pictures)

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Old 08-02-17, 01:08 PM
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Where to caulk this kitchen sink (with pictures)

I'm thinking about caulking all the red line. What about 1st pic: blue line, and 3rd pic:yellow line? The only place seems to be leaking is 2nd pic around the faucet base. For some reason countertop underside is wood. Maybe they somehow put mortar and countertop tile on top of the wood.
 
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Old 08-02-17, 01:26 PM
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I also have a tile counter top; it consists of plywood over the framework, then cement board with the tile set onto the cement board. My sink sets on a bead of caulk - no visible caulking.
 
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Old 08-02-17, 01:43 PM
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Why are you caulking it? Is the grout cracked? Does water leak between the tile and sink edge and drip inside the cabinet? As mark said, those sinks are normally caulked underneath the flange so that no caulking shows. If it needs to be redone, I would say you should remove the sink first, clean off old caulk, then bed the sink in a new bead of caulk. Caulking around the outside would be really crappy, as would caulking the grout joints.
 
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Old 08-02-17, 01:45 PM
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Mortar and tile on wood is the common way of doing it. Ideally cement board is also used.

The sink should really be caulked underneath that lip, external application probably won't last more than a few cleanings before it starts peeling.

Blue line, yeah could do that.

3rd pic yellow lines should be grouted and sealed, red line should be done with grout color matching caulk or clear.
 
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Old 08-02-17, 02:00 PM
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Is the grout cracked
Grout is not really cracked. Water is mainly leaking from the base of faucet on 2nd pic. Between the tiles and sink seems fine.
 
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Old 08-02-17, 02:04 PM
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This may sound funny, but i'd say fix the faucet.
 
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Old 08-03-17, 03:52 AM
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Agree with Xsleeper. The faucet is leaking, not the sink. Fix the leak and the sink caulking is a non-issue.
However, these are drop in sinks, not under counter. Caulking (or plumbers putty) should be used under the section that sits atop the counter (flange) as others have noted. The faucet bezel should also be "putty'd" to prevent surface water from getting under it.
 
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Old 08-03-17, 04:14 AM
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I thought the gasket [or whatever it's called] under the faucet was enough to keep it sealed. I never caulked/puttied mine and it doesn't leak water under it.
 
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Old 08-03-17, 02:02 PM
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I find that it depends on the sink. In many cases the surface is not perfectly flat. And over time the plastic gasket tends to deteriorate. I'll stick with my plumbers putty and be sure.
 
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Old 08-03-17, 02:49 PM
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You set the faucet in plumbers putty.

Some new high end faucets come with a rubber gasket so no putty needed.

That faucet needs putty.

Additionally that type sink gets a bead of putty too. Well thats how I do them.

Cast iron ill use Phenoseal. phenoseal is all I use.
 
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Old 08-03-17, 02:53 PM
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50 second mark here. There is always a groove on the faucet base for putty..

https://www.youtube.com/watch?v=RUdw2WZm3pg
 
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Old 08-03-17, 05:43 PM
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the only time you do not want to use plumbers putty is on the artificial marbleized tops. Supposedly it will stain and discolor the surface. In that case use a bead of silicone.
 
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