Normally the underside remains unfinished.

basilno:

The top could be pulled and polished, but it's gonna cost you. It could have been polished at the fabricator's, but you would have had to let him know ahead of time and it still would have been an extra.

You could buy a polisher and some three-step diamonds and do it yourself for $300.00 or so.

We had an 18 inch overhang on our bar in our old kitchen with Cambria countertops. The underside was not polished. I don't recall a big sticker but if you can't see it without sitting on the floor, it wouldn't phase me.

I asked the fabricators to have the underside of my overhang polished when they came to template. It is not as polished as the surface, but it is definitely smooth.

My granite is leathered and the underside of my bar overhang is honed. They also honed the small overhang around my main cabinets. I can't imagine them having left such a large overhang unfinished without at least asking if you wanted it done.

I have a slab of soapstone on hold for my island & got quotes from 3 fabricators last week. I was going to go with the lowest bid until I asked about polishing the underside of our 10.5" overhang. He said they will do 6", but it's $150 to do the extra. I am using the fabricator who is not charging for the underside polish; when taking this (and no upcharge for 3/8" double rounded edge) into account, his bid was then the lowest.

The fabricator told me most people don't ask about the underside polishing. Glad I did; the man at the slab WH advised me to ask this question. They should have told you about this, especially with a large overhang. It's a must for our soapstone; quite rough underside & concerned re legs getting scratched sitting at the island.

I think it really depends on the stone. Sounds like for some the slab is smooth enough to not cause any issues. Any part of my granite that I can feel underneath on the island is smooth enough. I also have mesh on it most of it (not to the edges). I opened a top drawer and felt under in the middle of the granite. Very smooth even with the mesh.

In all fairness to fabricators, leaving overhangs unfinished is standard industry practice. The only exception to this would be if the customer had a sunken living room and you could see the underside of the overhang while seated on the sofa. I have finished bottoms for this reason and charged accordingly.

Thanks everyone that's helpful information. We've decided it isn't a particularly big deal, I think it just took me by surprise. (It feels smooth enough- not polished, but not rough- I just found it strange to see this huge brand logo in a somewhat visible place- it's not a sticker, it's printed right onto the quartz.)

I know this thread is many years old, but Cambria does now offer a "Double Polished" version of their slabs. It must be special ordered and costs slightly more than just the top being polished.

Want should unfinished look like? I just discovered our under hang is particle board of some sort. Shouldn’t it have been the same quartz material on the bottom as on top? Please help me understand so I either fix it or know what not to do next time. Thank you.

Picture please. Particle board has no business being used as cantilever support.

Hi thanks for asking. I don’t know what this is but it doesn’t feel strong. Reminds of particle board stuff but I appreciate your insights.

That isn't particleboard, it is Oriented Strand Board (OSB). It makes great roofing underlayment, but countertop cantilever support, not so much. Cabinet grade plywood at a minimum, but I'm not that fond of that either. Steel or aluminum square tube please.

Thank you for clarifying what I’m looking at. Have you seen this before? Should it have this unfinished look? Is there a way to make it look nicer or can you offer suggestion? I’d appreciate your thoughts on this.

Here is an example of what an overhang underside might look like, when done correctly:

https://photos.app.goo.gl/qMiPWTfjeb5wY4iN9
Metal, not wood.

" Have you seen this before?" Yes. "Should it have this unfinished look?" No. "Is there a way to make it look nicer or can you offer suggestion?" Seal and paint it.

Thank you. I appreciate your insight. Warmest

Thank you @pittsburrito

Same problem...

HU:

Do you have a sunken living room or some other way for people other than your housecleaner to see this writing? Soak a rag in acetone and have at it please.

@Joseph Corlett, LLC what would you use to seal the underside of quartz?

Quartz doesn’t get sealed, unless you mean quartzite…

@HALLETT & Co. @Joseph Corlett, LLC suggested in order to hide an unsightly underside of a quartz counter overhang (in my case i have storage cabinets underneath and I can see what looks like several large orange rust stains) to seal and paint it. since it is not the finished top, but rough and unfinished do you need the sealer he recommended to get any paint to adhere?

You wouldn't want to apply Tenax Quartz Toner before painting the underside of engineered stone.