Countertop Overhangs & Supports
Planning an island, breakfast bar or extended countertop? The amount of unsupported overhang depends on your countertop material, thickness and overall design. Use this guide to understand when additional countertop supports may be needed.
Maximum Unsupported Overhangs
These are the maximum typical overhangs without additional supports such as steel brackets or corbels.
2cm Natural Stone
Maximum unsupported overhang
3cm Natural Stone
Maximum unsupported overhang
2cm Quartz
Maximum unsupported overhang
3cm Quartz
Maximum unsupported overhang
Remember the One-Third Rule
The unsupported portion of the countertop should never be more than one-third of the total countertop width. Even when an overhang falls within the limits above, the overall countertop design must still provide adequate support.
Need More Overhang? Add Proper Support.
Larger countertop overhangs require additional structural support. Steel countertop supports or brackets can provide the strength needed for islands, raised bars, breakfast seating and other extended surfaces.
Proper support helps distribute the weight of the stone or quartz back into the cabinetry or supporting wall while reducing unnecessary stress on the countertop.
Proper Placement
Supports should be positioned close enough together to prevent excessive unsupported spans.
End Support
Supports should also be positioned appropriately near each end of the countertop.
Hidden From View
Properly designed steel supports can provide strength while remaining mostly hidden beneath the finished countertop.
Countertop Support Options
Steel supports can help create functional seating and extended countertop areas without bulky decorative corbels interfering with legroom or the overall design.
What Length Countertop Bracket Do You Need?
The support needs to extend far enough beneath the countertop to properly support the overhang while also accounting for the width of the pony wall or other supporting structure.
- Begin with the countertop overhang plus the width of the supporting pony wall.
- A typical pony wall is approximately 4" wide.
- The support should normally end approximately 3"–4" before the front edge of the countertop.
- In this example: 20" total depth minus a 4" setback results in approximately a 16" bracket.
- If the supporting wall is built with 2x6 framing, adjust the bracket size to account for the wider wall.
How Many Countertop Brackets Will You Need?
The number of brackets depends on the total length of the countertop and the spacing required for the specific project. The example below shows how support quantity can be calculated.
96" Countertop
Plan Supports Before Installation
Countertop support placement should be considered during project planning. This allows brackets to be positioned where they provide the necessary structural support while remaining as discreet as possible beneath the countertop.
Every Countertop Project Is Different
These measurements are helpful planning guidelines. Final support requirements may vary depending on the countertop material, thickness, overhang depth, cabinetry, seam locations, cutouts and overall project design. Accent Countertops can determine the appropriate support configuration for your specific project.
Planning a Countertop Overhang?
Our countertop experts can help determine the proper overhang, support size and bracket placement for your island, bar or countertop project.
Contact Accent Countertops