A dark line opening up between your sink and the stone, or a damp cabinet floor, usually means an undermount sink is letting go. TopStone Granite is a Baltimore countertop fabricator that reattaches, re-anchors and reseals loose undermount sinks under granite, quartz, marble and quartzite. We work on tops we installed and on tops someone else put in.
A failed sink mount is one of the most common problems on granite kitchens 10 to 20 years old, especially where the original installer relied on silicone alone. Fixing it early protects the sink base cabinet, the drain connections and the thin stone rail in front of the bowl.
We bring 15+ years in stone countertops and 650+ completed jobs to every repair. TopStone is licensed and insured, and you can check MHIC #145977 on the Maryland Home Improvement Commission license lookup.
An undermount sink hangs from the underside of the countertop, so everything depends on how it is fastened. We repair the mount itself, not just the caulk line you can see from above.
Sink reattachment is one part of our wider countertop repair services. One visit can often cover a chipped edge or an open seam near the sink as well.
Undermount sinks rarely fall without warning. These are the signs to look for, from the least urgent to the most.
A thin dark line, a gap you can slide a business card into, or silicone that has split and peeled all point to a sink that has dropped slightly. Food and water collect in that gap, so it often looks moldy before anything else goes wrong.
Check the front edge nearest you first. That side carries the most load from dishes, heavy pots and people leaning on the counter.
Open the sink base and look at the cabinet floor. Swollen or bubbled particleboard, water stains on the underside of the bowl, or a musty smell mean water has been getting past the rim for a while.
A dripping drain or supply line can look the same, so we trace the water to its source before blaming the mount.
If the bowl moves, flexes or clicks when you press on the front or fill it with water, the anchors have let go. This is the urgent one.
Stop loading the sink with heavy pots and read the emergency answer in the FAQs below until it can be repaired.
The cutout is cut and polished in the fabrication shop, but the sink is mounted on site, and that step is where shortcuts hide. These are the usual causes behind a failed mount.
Most reattachments are done from inside the sink base cabinet, with the countertop left in place. The sequence matters more than any single product.
Skipping the cleaning step is a common reason a reattached sink lets go a second time. New adhesive cannot grip old silicone film.
Sometimes the sink is fine and the box under it is not. A sink base that has soaked up years of slow leaks can swell, sag or rot, and a wet cabinet floor will not hold a support system.
Warning signs include a soft or crumbling cabinet floor, side panels that are peeling apart, and front or back rails that have pulled loose. Mold behind the back panel is common when a leak has gone unnoticed for months.
We tell you plainly if the cabinet needs work before the sink can be remounted. We then plan the order of work so the sink goes back onto a solid, dry base rather than straight back onto damaged board.
A loose sink is a good moment to decide whether you want a different one. The new bowl has to suit the hole already in your stone, and that hole cannot get smaller.
Enlarging a cutout leaves narrower stone rails in front of and behind the sink, so we measure those widths before recommending it. Our sink and appliance cutouts page explains reveal styles and cutout options in more detail.
Every reattachment is quoted after we have seen the sink, the stone and the cabinet. Emailing clear photos to info@topstonegranite.com first helps us understand the job before the visit.
These are the factors that move the price:
Weigh that against the cost of a ruined sink base, or a cracked countertop if a heavy sink drops. Our countertop cost guide covers repair and replacement pricing in more depth, and your written quote spells out the warranty terms for the work.
Usually, yes. We work from inside the sink base cabinet, lowering the bowl, cleaning the stone and remounting it from below. The countertop only needs to come up in unusual cases, such as a top that has cracked through at the sink.
Plan on leaving it empty for about a day. Most silicones and epoxies used for sink mounting need roughly 24 hours before the bowl takes water and weight, though some cure faster. We tell you the exact wait for the materials used on your job before we leave.
A visible gap is not an emergency, but a sink that moves or has visibly dropped is. Stop using it, empty it, shut the supply valves if anything is leaking, and set a sturdy box or bucket under the bowl inside the cabinet to carry its weight. Then call us at (667) 400-3297, since we are open seven days a week.
Yes. The mounting methods are the same whoever installed the top, and we repair sinks under granite, quartz, marble and quartzite. If your countertop is still under another installer's workmanship warranty, check with them first so you do not void it.
Email photos of the gap, the cabinet floor and the underside of the bowl to info@topstonegranite.com, or call and we will set up a visit. The sooner a loose sink is reattached, the less there is to put right.
Call (667) 400-3297