What should be done when an undermount sink separates from the countertop?
Stop loading the sink and have the mounting system, adhesive, supports, plumbing, and countertop inspected promptly.
A separating sink can drop suddenly and damage plumbing or the countertop.
Temporary propping may reduce risk until repair, but it should not replace proper mounting.
The sink should be removed or supported while old adhesive is cleaned and mechanical supports are restored.
Water-damaged cabinets and sealant should also be addressed.