How to Mount Quartz Countertop

Installing a quartz countertop can transform the look and feel of your kitchen or bathroom. With proper planning and execution, you can have a beautiful, durable countertop that will last for years to come. Here is a comprehensive guide on how to mount a quartz countertop.


Quartz countertops, made from engineered stone, have become increasingly popular in recent years. They are an excellent alternative to natural stone surfaces like granite or marble. The main benefits of quartz include:

  • Extremely durable and scratch-resistant
  • Resists stains, burns, and etches
  • Easy maintenance
  • Seamless appearance
  • Various colors and patterns available

Before starting the installation process, be sure to choose the right quartz slabs for your space. Work with your countertop supplier to select the color, pattern, and sizing. Also have the supplier fabricate any cutouts needed for sinks, faucets, or other fixtures.

Gather the Necessary Materials

Mounting a quartz countertop is a multi-step process. Be sure you have all the supplies needed before getting started:

  • Quartz slabs
  • Silicone adhesive caulk
  • Shims
  • Brackets
  • Screws
  • Drill and drill bits
  • Tape measure
  • Level
  • Denatured alcohol
  • Clean rags
  • Dust masks
  • Gloves
  • Eye protection

Make sure your countertop supplier has fabricated the slabs to the specifications of your cabinets. Having all the right materials and tools will ensure the installation goes smoothly.

Prepare the Cabinets

The cabinets and base need to be structurally sound and prepared properly before installing the quartz:

  • Ensure cabinets are level and securely fastened. Shim and adjust as needed.
  • Clean the top of cabinets thoroughly to remove any dust, oils, or debris.
  • Apply painters tape along the top edges of the cabinet to prevent adhesive drips.
  • Mark precise measurements on the underside of the cabinets for bracket placement.
  • Drill pilot holes in the cabinet for the mounting brackets.

Proper cabinet preparation prevents uneven countertop placement and difficult installations.

Install the Mounting Brackets

Quartz countertops require strong support along the front and sides. Brackets need to be installed precisely:

  • Position brackets evenly starting at the corners, then space additional brackets every 20-24 inches.
  • Ensure brackets align precisely with pilot holes drilled in cabinet.
  • Fasten brackets using a screwdriver and screws. Screws should be snug but not overtightened.
  • Double check measurements between brackets for accuracy. Adjust if needed.
  • For added support, also install L-brackets at seams where two quartz slabs meet.

Proper bracket placement keeps the quartz firmly secured and prevents cracking.

Apply Adhesive to Cabinets

Adhesive is essential for bonding the quartz slabs to the cabinets:

  • Use a silicone adhesive specifically designed for quartz installations.
  • Run a continuous 1/4″ bead of adhesive along the top edges of the cabinets.
  • Spread adhesive using a putty knife, ensuring uniform coverage.
  • Apply extra adhesive near the edges and brackets.
  • Avoid excessive adhesive, as squeeze-out is difficult to remove once cured.
  • Allow adhesive to become slightly tacky before setting quartz.

The adhesive bead provides a resilient, shock-absorbing bond.

Lift and Place the Quartz Slabs

When ready, it’s time to mount the quartz:

  • Wear safety gloves and enlist help to lift the heavy slabs. Carefully place on a cushioned surface.
  • Ensure the polished side faces up. Verify placement/alignment.
  • Lift and set one end of the slab onto the cabinets, holding the edge at a 20-30° angle.
  • Slowly lower at an angle, maintaining alignment. Repeat for the other end.
  • Apply steady, even pressure as the slab is lowered to squeeze out excess adhesive.
  • Use shims between the quartz and wall for proper spacing.

Work slowly and communicate clearly with helpers to avoid accidents or breakage.

Allow Adhesive to Cure

Once placed, the quartz requires time to cure and bond properly:

  • Use painter’s tape to hold slabs tightly together at seams.
  • Ensure edges are squared and aligned with the cabinets below.
  • Gently wipe away any adhesive squeeze-out with a clean rag and denatured alcohol.
  • Avoid excessive pressure on the countertop and keep the area clear.
  • Allow adhesive to cure fully for 24-48 hours as specified before use.

Letting the adhesive cure properly results in a durable, lasting bond.

Finish the Installation

After allowing full cure time, finish up with these steps:

  • Carefully remove all tape from the quartz and cabinets.
  • Clean entire surface with non-abrasive quartz cleaner and rinse well.
  • Seal seams with silicone caulk in matching quartz color.
  • Install any fixtures like sinks, faucets, or backsplashes.

Beautifully mounted quartz countertops will upgrade your space for years to come! Proper planning, precision, safety measures, and patience during the mounting process are essential. Follow these steps closely and you can have stunning, durable quartz countertops that withstand heavy use.

Frequently Asked Questions

What type of saw is best for cutting quartz?

It’s recommended to have your quartz fabricator or installer handle any necessary cutting with a wet saw. For small trims, a high quality diamond blade on a circular saw with a vacuum attachment may be used.

How thick should the adhesive layer be?

Apply adhesive just thick enough to create a uniform 1/8″ – 1/4″ thick layer after the slab is mounted. Avoid using excessive adhesive which can ooze out.

Should I mount the quartz myself or hire a professional?

It’s ideal to have a professional fabricator and installer mount your quartz unless you have experience with the specialized tools and techniques required.

What should I use to clean and maintain the quartz?

Use a dedicated quartz cleaner or a mild soap and warm water. Avoid abrasive cleaners and pads which can dull the surface. Sealing is not necessary but can help resist stains.

How heavy are quartz slabs?

They typically weigh 15-20 pounds per square foot, so professional handling is recommended. Have at least two people lift and maneuver the slabs during mounting.

Can I mount quartz over existing laminate or tile countertops?

It is not recommended. Quartz should be mounted over a secure, smooth cabinet base for proper support.


Installing quartz countertops can take time and precision, but the results are worth it. Attractive, functional, and durable, quartz is built to last for many years with proper care. By following the techniques outlined here for measuring, cutting, securing, and sealing the slabs, you can achieve a flawless mounting that will upgrade any kitchen or bath. With some patience and attention to detail, you will wind up with a beautiful new quartz countertop that elevates your space.