How to Install Dishwasher Brackets on Quartz Countertop

Installing a dishwasher on a quartz countertop requires careful planning and execution to avoid damaging the countertop. Quartz is an engineered stone that is durable but still prone to cracking if not handled properly. With the right brackets, tools, and techniques, you can successfully install a dishwasher on quartz.

Choose Appropriate Brackets

Not all dishwasher brackets work well on quartz. You’ll need brackets specifically designed for engineered stone countertops. Look for the following features:

  • Rubberized pads to prevent scratching the quartz surface
  • Adjustable design to fit different countertop thicknesses
  • Open attachment that avoids drilling into the quartz

Stainless steel brackets with rubber padding are ideal. The rubber protects the quartz while the steel safely bears the weight of a loaded dishwasher.

Gather Tools and Supplies

In addition to the brackets, you’ll need:

  • Tape measure
  • Pencil
  • Electric drill with assorted drill bits
  • Screwdrivers
  • Level
  • Cabinet clamps
  • Rags
  • Denatured alcohol

Use high-quality, sharp drill bits designed for masonry or stone. New, clean rags and denatured alcohol will help keep the quartz free of debris and oil during installation.

Prepare the Installation Space

Carefully measure and mark where the dishwasher will sit underneath the countertop. Make sure there is sufficient room for the dishwasher to slide into place.

Use a rag with denatured alcohol to clean the quartz surface where the brackets will attach. This helps the brackets adhere properly.

Clamp temporary support boards to the underside of the countertop. This prevents cracking by stabilizing the quartz during installation.

Attach Brackets Properly

With the rubber pads facing the quartz, attach the brackets to the underside of the countertop. Tighten them by hand first, then carefully use a screwdriver for the final turns.

Too much torque can crack the quartz. Tighten just until the rubber pads grip the quartz. Avoid drilling into the quartz itself.

Space the brackets evenly based on the dishwasher model’s mounting requirements. Measure carefully and use a level to confirm the brackets are perfectly aligned.

Slide In Dishwasher

With the brackets securely in place, carefully slide the dishwasher into position. The dishwasher mounting bracket should align with the quartz countertop brackets.

Use a rubber mallet or hammer with a wood block to adjust the alignment if needed. Attach the dishwasher to the brackets following the manufacturer’s instructions.

Avoid hammering directly on the brackets or quartz countertop. Use only gentle pressure with the rubber mallet to fine tune the position.

Check Alignment and Operation

Confirm the dishwasher is level and opens/closes freely without scraping the countertop. Run it empty first to verify proper drainage and check for leaks.

Quartz is an ideal countertop for kitchens, but requires special care when installing appliances like dishwashers. With non-abrasive brackets, careful drilling, and proper alignment, you can enjoy trouble-free dishwasher use.

Frequently Asked Questions

How thick should the quartz be to support a dishwasher?

Most quartz manufacturers recommend a minimum thickness of 1.25 inches for supporting a dishwasher. Thicker quartz around 1.5 inches is ideal.

What size drill bit should be used?

Use a masonry drill bit sized for the bracket attachment screws. Usually this is around 5/32 inches or similar. Avoid very small drill bits that can crack quartz.

Is silicone sealant required?

Applying a thin silicone bead along the edges is recommended. This prevents water leaks between the dishwasher and quartz countertop. Use a high-quality silicone specifically for kitchen and bath.

Can you drill into a quartz countertop?

It’s best to avoid direct drilling into quartz if possible. The brackets should attach underneath without penetrating the quartz surface. If needed, drill slowly with masonry drill bits and gentle pressure.

What tools should not be used?

Avoid using power drivers, impact drivers and wrenches that can over-tighten the brackets. Do not hammer brackets directly against the quartz. Use only a gentle rubber mallet if needed.


Installing dishwasher brackets properly is crucial for avoiding damage to quartz countertops. Careful measurement, using the right tools and materials, and taking your time are key to success. With the right non-abrasive brackets secured underneath, you can safely enjoy the convenience of an integrated dishwasher with beautiful quartz countertops. Follow the techniques outlined here for the best results.