Onyx 18″ Column Caps

Inside Dimensions: 16" x 16"  
  Outside Dimensions: L 18 x W 18 x H 5.5 (inches)

  Product Gallery  

18 inch Column Cap - Color Options

Our Sandstone Onyx 18-inch Column Caps, crafted from specially formulated polyurethane with fire retardants and UV inhibitors, offer a durable, lightweight solution for capping off stone column wraps. They deliver an authentic textured sandstone finish. Easy to install, these fade-resistant caps come in a rich brown color, enhancing the aesthetic appeal of your project.

  Product Gallery  

Product Details and Specifications

Canadian distributor of Nextstone™

Polyurethane Sandstone Inside Corner Ledger Buff

Ledgers and Corners Accent your Installation

Cap your panel installation with our beautiful color choices. 

Comes in Five Beautiful colors

Our Sandstone Lineup Helps You Accent Your Panel Choices

Once you have selected your panels, match your sandstone trim color to the following products:

  • Sandstone Flush Corners for mitered panel corners or straight cuts.
  • Sandstone Sills and Trim for portals like windows and doors. 
  • Sandstone ledgers to cap your panels like a wainscotting.
  • Sandstone corners to increase ease and speed of install. 
  • Sandstone Caps for Posts and Columns

Tips & Troubleshooting

Installing on Metal or Metal Building

When installing on metal buildings, a backer board can be used as a sold substrate to allow all screws to attach properly.

The backer board or OSB should be at minimum ½” thick. This board needs to be attached securely to the building using a construction adhesive and screws. It may be necessary to bolt the screws down to avoid the panels and/or backerboard pulling away from the corrugated siding.

Use appropriate weather proof substrate or sheathing as per local codes. Then proceed as per normal installation instructions.

To streamline the ordering process for adding faux rock panels to your home’s facade, our website employs an intuitive bottom navigation system. This user-friendly feature guides you through each necessary step, ensuring no detail is overlooked.

From selecting the style and color of your panels to specifying dimensions and any additional installation accessories, our bottom navigation makes it easy to customize your order to fit your home’s unique needs.

This thoughtful design element empowers users to confidently make informed decisions, creating a seamless shopping experience from start to finish.

Installation Demo

Window and Door Trim

Faux Stone Siding and Trim Install

Tips on a Tight Panel Install

Introducing the NextStone Onyx Charcoal Column Caps, a seamless blend of innovation, durability, and aesthetic appeal. Crafted from specially formulated polyurethane combined with fire retardants and UV inhibitors, these column caps are cast from actual stone and rock patterns, delivering an authentic, textured sandstone finish that matches all other NextStone sandstone accessories. Our products are designed to significantly reduce the need to hire masonry installers, professional siding and decking installers, or skilled laborers. Each lightweight panel weighs just about 1 lb. per sq. ft., eliminating the need for additional materials, equipment, or labor. These easy-to-install column caps can be used to cap off a NextStone 30 in. slatestone column wrap or to finish a column made from NextStone flush corners. The solid polyurethane construction with an in-mold coating makes them fade-resistant and durable. You have the flexibility to either screw on the caps from under or attach them with a polyurethane adhesive. If needed, the caps can be easily cut with any woodworking saw to create a 2-piece cap. In addition to their decorative function, these caps offer energy savings with an increased R-value. Each cap covers an area of 1.5 sq. ft. and measures 3.75 in. in height, 3.75 in. in depth, and 18 in. in width. They come in a rich brown color, weigh 4 lbs., and are returnable within 90 days. We stand behind the quality of our product with a 20-year manufacturer’s warranty. Choose NextStone Sandstone Column Caps for a combination of beauty, ease, and longevity.


Our Commitment

Nextstone is dedicated to superior product quality and exceptional customer service, ensuring your home’s aesthetic is enhanced with our stonework. Experience unrivaled excellence with Nextstone—where your satisfaction is our priority.

How Can We be of Assistance?

© 2024 -NextStoneTM. All Rights Reserved

Connect With Us

Tel: 303-371-8232  |  TF: 1-866-371-8232

Fax: 720-294-0221

PO Box 39914 – Denver, CO 80239

© 2024 -NextStoneTM. All Rights Reserved