Undermount sinks are attached to the counter from underneath instead of being dropped into a hole on the counter and secured to the countertop with a lip. A common issue with the undermount design is that they can be prone to sagging over time. When the sink starts pulling away from the countertop, leaving a gap, it needs to be hiked back up and secured in place.
Why Sinks Become Unsealed and Their Solutions
Understand the most common causes for undermount kitchen sinks losing their seal, along with tips for how to fix the problem when you reseal the sink:
Poorly prepared surfaces: The bottom of the countertop (where it contacts the sink) may not have been cleaned thoroughly. Dust on granite or solid-surface such as Silestone can weaken the bond and should be cleaned up before installation. When you re-seal the sink, be sure to use denatured alcohol to clean off all surfaces prior to caulking.
Insecure clamps: The clamps or the epoxy, or both, used to secure the sink to the bottom of the countertop were loose enough to cause the caulk to quickly pull away. Tighten the clamps thoroughly.
Wrong sink sealant: The sink installer may have failed to use the correct kitchen sealant. If an ordinary caulk was used to seal the sink, it likely will fail quickly. Most undermount sink manufacturers recommend that you use pure, 100-percent silicone sealant for undermount sink installation.
Age and usage: Even perfectly installed undermount sinks can fail after enough time and use. The silicone sealant dries out and the clamps start to loosen due to constant vibrations on the counter and the weight of the sink.
Countertop specialists will ensure your undermount sink is installed correctly. They’ll use a metal or wood brace if needed, then attach the sink with epoxy adhesive. Finally, they’ll use silicone caulking to seal it up tight. Handyman Evans concentrates on customer care and satisfaction. We are a local and family owed business. We are going to do our best to satisfy your goals and expectations. If you have questions, we have the answers. We'll be available to serve you. When you call, we are going to respond to all of your concerns and questions.