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 undermount sink...silicone or adhesive caulk
Author: waukeshaplumbing (WI)

The counter top guys didnt mount my sinks...even though its not in my contract ill do it since its a new builder and i want to go with the flow.

i have to mount them myself and feel silicone will make a huge mess while i learn how to mount them....im planning on clear adhesive caulk instead...

i dont know how i would clean up the silicone if i use it instead?

mineral spirits?...it has concrete countertops..would the mineral spirits hurt the sink or concrete?

i dont have time to go pick up mineral spirits anyways...i hate dealing with silicone....

any one have any advice on the neg's of using adhesive caulk instead?

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 Re: undermount sink...silicone or adhesive caulk
Author: jimmy-o (CA)

There is nothing wrong with a good adhesive caulk....get the type which says "kitchen and bath" or such, meaning it has mildew inhibitive properties.

Mineral spirits I think works on silicone, but I prefer denatured alcohol. But water based products are a lot easier!

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 Re: undermount sink...silicone or adhesive caulk
Author: waukeshaplumbing (WI)

i only buy the highend antimold caulk

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 Re: undermount sink...silicone or adhesive caulk
Author: dlh (TX)

i dont remember exactly what the granite guys around here use but it looks similar to jb weld.

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PLUMBERS "Protecting The Health Of The Nation"

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 Re: undermount sink...silicone or adhesive caulk
Author: Shoemaker2 (MA)

When I use silicone I mask with tape, the surfaces adjacent to the joint, then use a little dish soap on my finger to smooth the joint. After the joint is complete but still wet, I pull off the tape and it leaves a perfect job.

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 Re: undermount sink...silicone or adhesive caulk
Author: PlumberManDan (IA)

Neither, I would insist that the countertop contractor install the sink, You can not just "GLUE" a SS sink to the underside of a concrete countertop and expect it to NOT have problems. You need to do some research or have the people that Specialize install it. Why take on something that you have No experience with in a house that you will be critiqued to the point of losing money.

PlumbCat TM 2003


Plumbermandan

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 Re: undermount sink...silicone or adhesive caulk
Author: packy (MA)

i agree....
it's not just mounting the sink. it is drilling the holes and setting the anchors for the clips to attach to.
i've not worked with cement counters but with granite, they use a special epoxy to set the anchors into.
i have used silicone and cleaned up with denatured alcohol to set a few undermount sinks but the holes/anchors were already done. it is not that difficult. as i said. the drilling and epoxy are the scary parts.
P/S, after setting the sink, the silicone joint is underneath and visible only by sticking your head below the level of the counter. impossibe to do with a sink full of dishes..

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 Re: undermount sink...silicone or adhesive caulk
Author: hj (AZ)

I put the silicone on the sink rim and then press the sink in place and secure it. I assume these are UNDERTOP mounts. If not then use tub and tile caulk and caulk around the edges. Just remember, once you START installing the sinks, you will NEVER be able to stop. I would not start in the first place.

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 Re: undermount sink...silicone or adhesive caulk
Author: dlh (TX)

i want the counter guys to do it as i dont want to take the chance of messing up that expensive counter and not having a scape goat when/if the sink itself falls

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PLUMBERS "Protecting The Health Of The Nation"

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 Re: undermount sink...silicone or adhesive caulk
Author: SwimRunPlumb (MI)

You are crazy to even attempt this.

Using adhesive caulk is even crazier. I have seen these sinks come unattached more than once. You have to use 2 part epoxy at least. Silicone is not even a good choice.

If you do mount it, are you going to drill the holes also, and how?? Demand that the counter top guys FINISH THEIR JOB.

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 Re: undermount sink...silicone or adhesive caulk
Author: hj (AZ)

One other point. The concrete was not poured in mid air, so there has to be a wood, or some other material, base under the concrete. Was it cut back far enough so the sink will touch the bottom of the concrete?

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 Re: undermount sink...silicone or adhesive caulk
Author: waukeshaplumbing (WI)

these were bathroom sinks w/ concrete couter tops

white kohler undermounts

the clips were already tapcon'd and ready for me.

the countertop guys didnt drill my holes in the concrete for the WP tub deck correctly either...they made 1 1/8" hole when Kohler needs 1 1/2" for the handles..

the whole thing is goofy....i did the sinks for FREE too....im making decent $ on this job and have done a few extra's for free...its a great new high end customer...i also know they think my prices are low (which i havent heard in over a year)...so i will add extra on the next job to cover these extra's which may occure on all their jobs...

it took 1/2 hour to do both sinks...i also agree its the countertop guys responsibility....

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 Re: undermount sink...silicone or adhesive caulk
Author: hj (AZ)

You probably go the job because you were low, not because they liked your work. You will find out once you raise your price, and someone else is lower. Most contractors are looking for the lowest price, and are not TOO concerned with the quality as long as the job looks good and works.

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