Rockmount Premium Black XL Corner L-Panel | 9" x 12" x 6" Splitface Slate

Complete your stone transformation with the Rockmount Premium Black XL Corner Panel. Specifically engineered for use with our 9x24 XL ledger series, these interlocking L-shaped pieces provide a seamless transition around outer corners, pillars, and fireplace edges.

Crafted from 100% natural Black Slate, these corners feature the same rugged, splitface texture and deep obsidian tones as the flat panels. The "XL" 9-inch height ensures a perfect vertical match, allowing you to achieve a cohesive, high-end architectural finish that looks like authentic, full-bed masonry.

Product Specifications

• Material: 100% Natural Slate

• Collection: Rockmount XL Series

• Dimensions: 9" (Height) x 12" (Long Side) x 6" (Short Side)

• Format: L-Shaped Interlocking Corner

• Thickness: 0.75" to 1.5" (Staggered 3D depth)

• Finish: Natural Splitface

• Color: Deep Charcoal to Midnight Black

• Application: Exterior Pillars, Fireplace Corners, Retaining Walls

Why Use XL L-Shaped Corners?

• Professional Finish: "L" corners wrap around the edge of your wall, hiding the back-end of the stone and the substrate for a completely "finished" look.

• Structural Appearance: By staggering the corners during installation, you mimic the look of traditional thick-set stone blocks, adding massive visual weight and value to your design.

• Labor Savings: Pre-fabricated corners eliminate the need for precision miter sawing on-site, significantly reducing installation time and waste.

• Seamless Integration: Designed with the same interlocking Z-shape as the flat panels, these corners "puzzle" into the rest of the wall for a continuous, grout-free surface.

Installation & Maintenance Tips

• Staggering: When installing, flip the corner panels every other row (alternating the 12" and 6" sides) to break up the vertical seam and create a more natural, hand-laid appearance.

• Adhesive: Use a White or Dark Large Format Tile (LFT) Mortar. For exterior or heavy-duty projects, a high-bond thinset is required to ensure the corners remain secure against gravity and weather.

• Back-Buttering: For corners, we highly recommend "back-buttering" the tile (applying a thin layer of mortar directly to the back of the stone) to ensure 100% coverage and bond strength.

• Sealing: Protect your corners with a penetrating stone sealer. For a "wet" look that makes the black slate even more dramatic, use a Stone Enhancer.

Frequently Asked Questions (FAQ)

How many corner panels do I need? Corners are typically sold by the "linear foot." Measure the total height of your corner in inches and divide by 9 (the height of each panel) to find your total piece count.

Are these the same color as the 9x24 flat panels? Yes. These are part of the same Premium Black Slate batch, ensuring a perfect color and texture match for a uniform wall.

Can I use these for a column or pillar? Absolutely. These are the preferred choice for wrapping square columns or gate posts, providing a clean, 3D stone look on all four sides.

Do I need to grout the corners? No. Just like the flat panels, these corners are designed to be "dry-stacked" and pressed tight against one another for a seamless look.