How to Support a Quartz Countertop Overhang

Choose the Right Overhang Length

The maximum recommended overhang for a 1 1/4″ thick quartz countertop is 6 inches. Anything longer than that will require additional support. Consider the look you want and how much overhang space you need when choosing length. Standard overhangs are:

  • 3 inches – Provides space for barstools and looks sleek.
  • 4-5 inches – Ideal for a breakfast bar or prep space.
  • 6 inches – Maximum recommended unsupported overhang.

Thicker quartz of 2cm (3/4″) or 3cm (1 1/4″) can safely support more overhang. Thinner 1.2cm (1/2″) quartz requires support for overhangs longer than 4 inches.

Use Proper Cabinetry

The foundation provided by your cabinetry is vital for supporting overhangs. Use quality cabinet boxes with:

  • 3⁄4” thick cabinet sides
  • Fully secured cabinets with braces and gussets
  • Sturdy faceframe build with thick facing
  • Solid wood blocking added for strength

Avoid flimsy cabinets that can sag or bow under the quartz weight. Reinforce as needed before installing.

Add Support Structures

Adding support structures prevents long overhangs from cracking or drooping over time. Common options include:


  • 90-degree metal brackets attached under overhang to strengthen. Use at least every 12 inches.
  • Corbel brackets visually support the overhang while providing hidden reinforcement.
  • Floating brackets connect the quartz to wall for support. Conceal with trim.

Wall Supports

  • Attach cleats or ledgers to the wall to support overhang. Can be hidden by trim.
  • Build sheetrock knee walls under overhang for hidden support.


  • Floor-to-counter legs visually carry the overhang’s weight. Requires precise installation.
  • Pedestal ends on island overhangs are anchored to floor for support.

Use Proper Installation Techniques

Proper installation is key to prevent future cracking or collapse:

  • Cleanly cut notches in cabinet sides and faceframe to fit quartz. Avoid point loading.
  • Use adhesives like silicon to secure quartz to cabinetry. Follow manufacturer instructions.
  • Carefully shim and level cabinets so quartz sits flush and even.
  • Seal seams between quartz slabs to prevent moisture damage.

With the right materials and proper installation, you can have stylish, well-supported quartz overhangs that last for many years. Consult a professional if unsure about structural needs. Careful planning makes overhang installation smooth and successful.

Frequently Asked Questions About Supporting Quartz Overhangs

What is the best support for a 12 inch quartz overhang?

For a 12 inch overhang, using heavy duty corbel brackets anchored to the wall every 8-10 inches is best. Pedestals or legs can also work if anchored properly. Additional cabinet reinforcement is also advised.

How far should brackets be spaced for quartz overhangs?

Brackets should be spaced 8-12 inches apart for adequate support. Use the smallest spacing needed for the overhang length and thickness. Thicker quartz and longer overhangs need more closely spaced brackets.

Can I have an 8 inch overhang with 2cm quartz?

8 inches is possible but pushing the limits for 2cm thick quartz. Make sure underlying cabinets are reinforced and use closely spaced brackets, corbels or other supports every 6-8 inches. Get an expert opinion to ensure structural integrity.

What can I use if wall support is not an option?

If wall support is not feasible, consider using floor-to-counter legs or pedestals. These provide hidden structural support while maintaining the clean overhang look. Proper installation is crucial for stability.

Should I get a professional to install overhang supports?

For DIYers, smaller overhangs of 3-4” are doable. But for longer spans or heavy use areas, hiring a pro to add structural supports is wise. They understand load distribution and can ensure your overhang lasts without sagging.


With some planning and the right materials, long quartz overhangs can be installed securely. Evaluate the overhang length, cabinetry, and space to determine the support structures needed. Wall-mounted brackets or corbels are commonly used and can be attractively concealed. Proper adhesive use and seam sealing also ensures durability. For large overhangs or DIY uncertainty, consult a professional fabricator or installer. With the proper techniques, you can have an eye-catching, well-supported quartz overhang that withstands years of use.