How to Mount a Dishwasher to a Quartz Countertop


Installing a dishwasher in your kitchen can be a great way to save time and effort when cleaning up after meals. However, proper installation is key to ensuring your dishwasher works efficiently for years to come. When installing a dishwasher on a quartz countertop, there are some important steps to take for a secure and long-lasting mount. In this article, we will walk through the process step-by-step.

Assess Your Dishwasher and Countertop

Before getting started, take some time to inspect your dishwasher model and quartz countertop:

  • Check the manual that came with your dishwasher for any special mounting instructions or hardware that may be required. Different models can have varying installation procedures.
  • Examine the underside of your quartz countertop and take note of thickness, reinforcement bars, and any special features. This will determine the mounting method.
  • Look at the size and location of the sink cutout where the dishwasher will be installed. This opening must properly accommodate your particular appliance.

Gather the Necessary Materials

For mounting a dishwasher to quartz, you will need:

  • Power drill
  • Phillips screwdriver
  • Tape measure
  • Pencil
  • Mounting brackets designed for quartz countertops
  • High-strength construction adhesive (liquid nails)
  • Silicone sealant
  • Dishwasher installation kit (may come with appliance)

Be sure to get mounting brackets specifically made for quartz. The material is rigid and dense, requiring special fasteners that can provide a stable grip.

Prepare the Mounting Area

Once you have assembled all your supplies, take the following preparatory steps:

  • Use a tape measure and pencil to mark clearly where the dishwasher will be positioned. Make sure the dishwasher will be centered within the sink base cabinet.
  • Thoroughly clean the underside of the quartz countertop where the brackets will adhere using denatured alcohol. Remove any dust, grease or debris.
  • Check for level. Use a spirit level to ensure the underside of the countertop is even. Shim any low spots if needed.
  • Carefully read the instructions that come with your mounting brackets to plan proper placement.

Attach the Mounting Brackets

With the area prepped, it’s time to install the brackets:

  • Apply a generous bead of construction adhesive to the back of each bracket before pressing it into place on the marked locations.
  • Allow the adhesive to set according to the manufacturer’s directions. This secures the brackets firmly into place.
  • Once dried, use a drill to drive two screws through each bracket into the quartz. This provides added stability.
  • Make sure the brackets are lined up properly so the dishwasher will align with the sink opening when lifted into place.

Lift the Dishwasher into Position

Now you’re ready to lift the dishwasher:

  • Before lifting, insert any drain hoses through the cabinet access hole that match up with the sink plumbing.
  • Carefully lift the dishwasher up into place, lining up the mounting brackets with the corresponding slots on the dishwasher’s frame.
  • When aligned, press the dishwasher back so the brackets insert fully into the slots.
  • Use a screwdriver to install any screws that secure the dishwasher to the brackets for a snug fit.

Complete the Installation Process

To complete the installation:

  • Connect the drain hose to the sink plumbing and attach water supply lines to the dishwasher.
  • Run a bead of silicone sealant around the edges of the dishwasher where it meets the counter and cabinetry. This prevents moisture damage.
  • Power on the unit and test operation by running a rinse cycle. Check for leaks.
  • Slide the dishwasher into place, ensuring no hoses are pinched.
  • Install lower bracket trim pieces for a finished look.

With the dishwasher firmly secured to the quartz and properly functioning, your install is complete! Be sure to thoroughly clean the quartz surface once installation is finished. Enjoy the convenience of a dishwasher with a beautiful and durable countertop.

Frequently Asked Questions

Can I install a dishwasher on quartz myself or do I need a professional?

Installing a dishwasher on a quartz countertop is a DIY-friendly project for someone experienced with home repairs. If you are unsure, hiring a professional may be safer to avoid damaging the countertop.

What size screws should I use to secure the mounting brackets?

Opt for 1 1⁄2 to 2 inch #8 stainless steel screws when fastening the mounting brackets to quartz. Make sure they are specifically rated for use with engineered stone.

How long should I let the construction adhesive cure before installing the dishwasher?

Follow the adhesive manufacturer’s recommended curing time, usually around 24-48 hours. This allows a strong, durable bond to form.

Will running the dishwasher cause vibration issues for the quartz?

Quartz is a very rigid material, so vibration is not a major concern. Properly installed mounting brackets will prevent the dishwasher from shaking against the countertop during operation.

Can you install a dishwasher on all quartz countertop thicknesses?

Most dishwashers can be installed on standard quartz thicknesses of 1 1⁄4 inches to 2 inches. For unusually thick quartz, you may need custom brackets. Consult manufacturer guidelines.

How can I find the right mounting brackets for my quartz countertop?

Check with the countertop manufacturer for the best bracket recommendations. Otherwise, seek generic brackets designed specifically to be used with engineered stone materials.


Installing a dishwasher on quartz countertops is a worthwhile upgrade for your kitchen. With the right materials and careful preparation, you can securely mount the appliance for long-term use. Be sure to follow all dishwasher instructions and properly affix the mounting brackets to the rigid quartz surface. Precision and patience are needed for a professional-looking result. With some DIY skills, you can enjoy a practical dishwasher combined with durable, low-maintenance quartz.