How to Anchor a Quartz Countertop

Installing a quartz countertop can greatly enhance the look and functionality of your kitchen or bathroom. However, proper anchoring is crucial to ensure the countertop is securely fastened. Here is a comprehensive guide on how to properly anchor a quartz countertop.

Choose the Right Anchors

The first step is selecting the proper anchors for a quartz countertop installation. Here are some of the best options:

Metal Brackets

  • Sturdy L-shaped brackets that attach to the underside of the countertop.
  • Available in stainless steel or zinc-plated steel to resist rust.
  • Attaches with screws drilled into the quartz.
  • Provides very secure anchoring.

Adhesive Anchors

  • Special two-part epoxy adhesive anchors.
  • Inserts directly into holes drilled into the quartz.
  • Bonds tightly when the adhesive hardens.
  • More aesthetically pleasing since holes are concealed.


  • Spring-loaded clips that clamp to the bottom of the quartz.
  • Usually made of plastic for kitchens or brass for bathrooms.
  • Quick and easy to install but not quite as secure as other anchors.

For a permanent installation, metal brackets or adhesive anchors are recommended over clips.

Prepare the Base Cabinets

Proper prep of the base cabinets is crucial for anchoring a quartz countertop:

  • Cabinets must be level, plumb, and securely fastened to each other.
  • Use shims as needed to level the cabinets.
  • Seal any gaps between the cabinets and walls.
  • Apply adhesive caulk to the top edges of the cabinets.
  • Ensure at least 1″ overhang for the countertop.

Take your time with this step to ensure the cabinets can properly support the weight of the quartz.

Mark Locations for Anchors

Once the cabinets are prepped, map out where the anchors will be installed:

  • Mark at least every 12″ along the front and rear of the cabinets.
  • Also place anchors within 6″ of the corners and gaps.
  • Space any additional anchors evenly in between.
  • Make sure marks are at least 2″ from the edges and any seams.

Having enough anchors is vital to prevent sagging, cracking, or separation of the quartz.

Drill Holes for Anchors

With the locations marked, it’s time to drill holes to install the anchors:

  • Use a carbide-tipped masonry drill bit for quartz.
  • Drill holes slightly larger than the anchor size (usually 5/16″).
  • Drill only 1/4″ to 1/2″ deep to avoid going through the quartz.
  • Vacuum holes thoroughly to remove any debris.

Take care not to crack or chip the quartz when drilling anchor holes.

Fasten the Anchors

Once holes are drilled, fasten the anchors according to the manufacturer’s instructions:

  • For metal brackets, use a Phillips screwdriver to attach to the quartz.
  • When using epoxy anchors, thoroughly clean holes before applying adhesive.
  • Tighten clips by hand or with a screwdriver, ensuring the quartz is snug against the cabinets.

Do not over-tighten anchors, as this can cause unnecessary stress and cracking over time.

Apply Silicone Sealant

After installing the countertop and anchoring it down, apply a silicone sealant:

  • Run a small bead along the seam between the quartz and wall.
  • Also apply around edges where the countertop meets the cabinets.
  • Use a smoothing tool to evenly spread the sealant before it dries.

The sealant prevents moisture from seeping under the countertop and causing damage.

Helpful Tips

Follow these additional tips for proper anchoring:

  • Carefully lower/position the countertop onto the cabinets when installing.
  • Use shims to adjust any slight gaps before tightening anchors.
  • Periodically check anchors to ensure they remain secure over time.
  • Avoid harsh cleaners or placing extremely hot items on quartz surfaces.

Proper anchoring combined with care and maintenance will keep a quartz countertop stable and beautiful for years to come.

Frequently Asked Questions

What type of drill bit should be used to drill into quartz?

For drilling into quartz, use carbide-tipped masonry drill bits. These are designed to drill through dense engineered stone without cracking or chipping.

How deep should anchor holes be drilled into a quartz countertop?

Anchor holes only need to be drilled 1/4″ to 1/2″ deep into the bottom of the quartz. Any deeper risks drilling completely through the material.

Should anything be used to clean anchor holes before installing anchors?

Yes, anchor holes should be thoroughly vacuumed to remove all debris before fastening the anchors. Remaining debris can prevent proper fitting and bonding.

How soon can a newly installed quartz countertop be used?

It’s best to avoid placing any heavy objects on a new quartz countertop for at least 24 hours after anchoring it down. This allows the adhesive and anchors to fully cure and harden.

How often should quartz countertop anchors be checked?

It’s wise to check quartz anchors periodically, such as when seasonal humidity changes occur. Tightening or replacing any loose anchors prevents future separation or cracking issues.


Installing quartz countertops can instantly elevate the design of any kitchen or bath. Paying close attention to properly anchoring them down will ensure they remain securely fastened for long-lasting beauty and enjoyment. Following this comprehensive guide will equip you with the knowledge needed to confidently anchor quartz countertops that will withstand years of use. With the right materials, careful prep, and proper technique, you can achieve a professional-looking installation.