Potential Problems with Undermounting Sinks in Granite and Quartz Countertops

Serving Portland OR, Vancouver WA, and the Oregon Coast

lammi kitchen Granite countertops from Crowley's Granite in Portland OR & Vancouver WA

One of the many advantages of granite and quartz countertops in a kitchen is the unique option to “undermount” a stainless, composite, or cast-iron sink.

Not only do they look great, but they are supremely functional because the stuff destined for the garbage disposal can be easily wiped into the bowl without the annoying flange that is common with a top-mounted sink! But beware, improper installation techniques and sub-standard sealants can turn your dream counters into a nightmare of repair costs and inconvenience. 

As your local countertop experts in the Vancouver-Portland Metro area, we want to help you stay informed. Below, we’ll discuss 3 common mistakes made while installing an undermount sink in granite and quartz countertops.

Common Pitfalls When Installing Undermount Sinks in Quartz and Granite Countertops

Installing an undermount sink in quartz or granite countertops can enhance the look and functionality of your kitchen or bathroom. However, even with the right tools and materials, mistakes during the installation process can lead to significant issues down the line. 

Understanding these pitfalls is essential for a flawless undermount sink installation.

Delamination Due to Inadequate Adhesive

Many granite and quartz installers bypass mechanical sink attachments like clips, rails, or brackets, and instead use silicone adhesive to secure the sink to the countertop. This is an inherently flawed method. The continuous strain of the sink on the countertop. The weight, moisture, and vibrations of the garbage disposal will cause it to literally pull away. This will result in moisture problems in your sink cabinet and costly repair bills to make it right.

Permanent Epoxies Turn Sinks into Sunk Costs

To avoid the limitations of silicone adhesive, some granite and quartz installers turn to permanent epoxy or plywood substrate. The problem with this method is the opposite — if the sink is defective or damaged, there’s nothing you can do. There’s no way to remove it or replace it without destroying the granite or quartz.

Failing to Seal the Deal

As with top-mount sinks, undermount sinks on granite or quartz need to be properly sealed. If not, it can lead to mold and mildew problems in the cabinet. For best results, it’s important to use high-quality caulking material or sealant and follow the manufacturer’s instructions explicitly. 

Your Local Countertop Installation Professionals in the Vancouver-Portland Metro Area 

Crowley’s Granite & Quartz is your local countertop installation company. We think that everyone deserves to have a kitchen that they are proud to show off. With that in mind, if you are inexperienced in sink installations, it is best to leave it to professionals.

If you have any questions regarding countertop installation or replacement, call us today! We’ll be more than happy to provide you with a free in-home consultation.

The top 3 undermount sink installation techniques for granite and quartz

3 Mistakes Made While Installing an Undermount Sink in Granite and Quartz in Portland OR & Vancouver WA

Serving Portland OR, Vancouver WA, and the Oregon Coast

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