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Old 08-03-2015, 09:22 AM   #1
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Undermount kitchen sink installation question


I'm getting ready to install a copper undermount sink I bought at that Big Orange store. It's going under a butcher-block style wood counter that I fabricated.

My question is how best to secure the sink to the underside of the counter. The sink came with a set of 8 clips and threaded inserts. The instructions are very vague (what a surprise) but it seems to me the instructions are written to install the sink under granite or a similar man-made substitute. The instructions say to drill holes, insert the threaded plugs and then screw in the clips to hold the sink. Okee Dokee

I'm just wondering if, with a wooden countertop, the sink would hold better if I didn't use the threaded inserts and instead just used some short and fat wood screws and screwed the clips directly into the underside of the countertop..

Any thoughts anybody? Thanks.

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Old 08-03-2015, 09:36 AM   #2
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Undermount kitchen sink installation question


I install a 2x3 or 2x4 frame for the sink to sit on. The counter top rests directly on to the sink. The sink flange is silicone caulk to seal it.
If the sink needs to be removed, the frame can be unscrewed under the sink base cabinet.
Wood counters next to the sink are a short term counter.

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Old 08-03-2015, 09:45 AM   #3
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Undermount kitchen sink installation question


I'm not too concerned about the wood counter itself. It's not "food-safe". It's topped with 5 coats of poly. The end-grain at the sink edge and the underside near the sink will be coated with marine spar varnish.
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Old 08-03-2015, 10:01 AM   #4
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Undermount kitchen sink installation question


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I'm not too concerned about the wood counter itself. It's not "food-safe". It's topped with 5 coats of poly. The end-grain at the sink edge and the underside near the sink will be coated with marine spar varnish.
I did an oak 5/4" thick top for the bath vanity. Used multiply coats of marine poly. This had a drop in sink. After 5 years it was replaced due to discoloration. It was only a 25" wide top so no big deal.
This was in 1981-1985. Maybe the poly is better now.
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