How Do They Attach Quartz Countertops

Preparing the Base Cabinets

The first step is ensuring your base cabinets can support the weight of the quartz slabs. Quartz is heavier than other countertop materials like laminate or tile. The base cabinets must be level, plumb, and securely attached to the wall studs. Any sagging or unevenness in the cabinet base can cause the countertop to crack or break over time.

Measuring and Template Making

Once the cabinets are prepared, the installer will take precise measurements of the overall countertop area. These measurements are used to create a template. This is an outline that shows where the countertop will sit in relation to the walls, corners, sink, stove, and other fixed elements. The template ensures the countertop will fit correctly. It also allows the fabricator to cut the slab and make cutouts ahead of time.

Securing the Countertop

Quartz slabs are very heavy, often weighing over 100 pounds per square foot. So adequate support and fastening are critical. There are a few methods installers use to securely attach the slabs:


A high-quality construction adhesive is applied in beads or dots along the top of the cabinet. The quartz slab is then set directly onto the adhesive and pressed firmly into place. Brackets around the perimeter also help secure it. The adhesive cures and creates a tight bond.


Metal clips get screwed into the cabinet frame. The quartz then sits on top of the clips, which grip the bottom edge of the slab. Some installers will also apply adhesive for added support.


Channels are long strips of metal or plastic that get mounted to the cabinet base. The quartz countertop then sits inside the channel, creating a slot that holds the edges of the slab. Adhesive is usually used as well.

Sealing the Seams

Once in place, the countertop installer seals and finishes the quartz slabs. If more than one piece is used, the seams between them are bonded together with epoxy resin to create a smooth, impervious joint. The installer also applies any edge treatments and ensures the countertop is securely integrated with the backsplash and any sinks or cooktops.

Curing and Cleaning

It takes 24-48 hours for adhesives and bonding agents to fully cure. The installers should avoid any heavy impact or stress on the countertops during this time. Once cured, the quartz can withstand years of regular use. The installers do a final wipe down to remove any excess sealant and adhesive residue.

With proper installation, quartz countertops become seamless, sturdy fixtures that can handle all the wear-and-tear of a busy kitchen. Taking the time to correctly attach the slabs ensures they will enhance the space for many years to come.

Frequently Asked Questions About Attaching Quartz Countertops

Can I install quartz countertops myself?

It is possible for an experienced DIYer to install quartz countertops on their own. However, it’s a very challenging project that requires great precision. Securing the heavy slabs and joining seams perfectly take skill. Many people prefer hiring professional installers to ensure it’s done right.

What thickness should I choose for quartz countertops?

The standard thickness for quartz countertops is 3/4″. Thicker options like 1-1/4″ or 1-1/2″ provide extra sturdiness for floors or heavy-use areas. Thinner 1/2″ slabs are occasionally used for vertical surfaces like backsplashes.

How are the seams between quartz countertop slabs joined?

The seams are bonded using a special two-part epoxy adhesive. This creates an impervious, hygienic joint. When done properly, the seams are barely noticeable. Good installers will make the joints seamless.

Can you attach quartz straight on top of laminate or tile?

No, the existing surface must be removed, and the cabinets must be prepared to support the weight of the quartz. A proper substrate like plywood is needed. Simply installing over old countertops will likely lead to failure.

Should anything be sealed underneath the quartz slabs?

Yes, the wood or plywood cabinet base should be sealed. This prevents moisture from being absorbed and causing the substrate to swell or warp, which can damage the attachment. A waterproof membrane or vapor barrier is often applied.

How long does it take for the adhesive to fully cure?

Most adhesives take 24-48 hours to reach full strength. No heavy impact or weight should be applied during this time. The bond will continue improving over several days. Allow ample curing time before using the countertops.


Attaching quartz countertops is a precise process that requires careful preparation, measurement, securing, and seam-sealing. Hiring experienced professionals is the best way to ensure a successful installation. With proper attachment, quartz makes an extremely durable, low-maintenance countertop that can handle years of daily use while maintaining its beautiful appearance. Taking the time to properly install the slabs leads to a countertop installation you can enjoy for decades to come.