Product Overview

MSI XL RockMount™ Royal Cream 3D Honed 9" × 18" Marble Corner Ledger Panel creates a finished 90-degree transition for Royal Cream 3D Honed stacked-stone installations. Each preassembled L-shaped piece wraps naturally around columns, fireplace projections, exterior façades, retaining walls, and outdoor-kitchen structures without exposing flat saw-cut edges.

Crafted from genuine marble, the corner features slender strips arranged at varying depths for a sculptural three-dimensional appearance. Its smooth honed finish gives the dimensional surface a sophisticated, low-sheen character, while creamy off-white, ivory, pale beige, and subtle gray tones create a quiet, refined color palette.

The corner coordinates directly with MSI Royal Cream 3D Honed 9" × 24" flat ledger panels, SKU LPNLMROYCRE924-3DH.

Technical Specifications

MSI confirms the 3D honed marble construction, matching 9" × 24" panels, indoor and outdoor wall applications, and corner SKU on its official Royal Cream 3D Honed page.

Recommended Applications

• Fireplace Corners: Wraps fireplace projections and chimney features with a continuous dimensional-marble surface.

• Column and Pillar Wraps: Finishes outside corners without exposing flat cuts from the coordinating ledger panels.

• Exterior Façades: Creates clean transitions around architectural projections and entrance features.

• Outdoor-Kitchen Islands: Wraps barbecue islands, bar structures, and entertainment walls.

• Retaining and Planter Walls: Provides a finished veneer around properly constructed masonry corners.

• Interior Feature Walls: Suitable for dimensional wall installations that extend around columns, partitions, and architectural returns.

• Commercial Interiors: Adds refined natural-stone detail to hospitality columns, restaurant features, reception walls, and retail displays.

Installation & Handling Guidelines

⚠️ IMPORTANT: INSTALL THE CORNERS BEFORE THE FLAT PANELS

Establish each corner course first, then cut and fit the coordinating 9" × 24" flat panels into the corner returns.

• Use the Correct Corner: Do not substitute the standard Royal Cream splitface corner. Only the -3DH version matches the Royal Cream 3D Honed panel.

• Alternate Returns: Rotate successive pieces so the 12-inch and 6-inch returns alternate between walls. This prevents a continuous vertical seam.

• Approved Substrate: Install over clean, flat, structurally sound concrete, masonry, or properly secured cementitious backer board.

• Mortar Selection: Use premium white polymer-modified Large and Heavy Tile mortar meeting ANSI A118.4 or A118.15 and approved for natural marble.

• Mortar Coverage: Directionally trowel the substrate and back-butter every corner. Exterior, wet-area, and fireplace installations require substantially complete coverage.

• Tight-Joint Installation: Fit the corner and flat panels closely together. Conventional exposed grout joints are normally not used.

• Maintain Course Alignment: Keep consistent nine-inch courses so the corners align with the coordinating flat panels.

• Protect the Honed Surface: Use padded tools and clean gloves to prevent scratches, mortar smears, and edge damage during installation.

• Exterior Installation: Provide suitable waterproofing, flashing, drainage, movement joints, and exterior-rated setting materials.

• Fireplace Installation: Follow the fireplace manufacturer’s required clearances and local building codes.

• Cutting Safety: Wet-cut with a diamond blade designed for marble. Never dry-cut or grind because fabrication produces hazardous respirable silica dust.

• Order Allowance: Add approximately 10–15% for breakage, cuts, shade blending, and future repairs.

Quantity Calculation

Each corner piece covers approximately nine vertical inches, so approximately 1.34 pieces are required per vertical foot.

Calculate every vertical corner separately before adding approximately 10–15% allowance.

Shade Variation

Royal Cream is genuine natural marble. Differences in cream tone, gray mineral movement, strip thickness, honed texture, and dimensional depth are inherent characteristics.

Blend corner pieces and flat panels from the complete order before installation. Confirm that both products share an acceptable color range before permanently setting them.

Care & Maintenance

• Remove dust using a soft-bristle brush or vacuum attachment.

• Clean with warm water and a neutral-pH cleaner formulated for marble.

• Avoid vinegar, acidic cleaners, bleach, abrasive powders, and wire brushes.

• Wipe cooking oils, smoke residue, and strongly pigmented spills promptly.

• A penetrating natural-stone sealer may be applied in exterior, moisture-, grease-, or stain-prone locations.

• Test the sealer first because some formulations can deepen the creamy coloration.

• Inspect exterior installations periodically for open joints, failed sealant, flashing problems, or moisture intrusion.

Design Profile

• Aesthetic: Quiet luxury, contemporary Mediterranean, organic modern, spa-inspired, and refined transitional.

• Color Character: Creamy off-white and ivory with pale beige and soft-gray mineral movement.

• Visual Advantage: The L-shaped construction preserves the appearance of continuous dimensional masonry around outside corners.

• Complementary Materials: White oak, walnut, warm plaster, creamy quartz, travertine, and architectural concrete.

• Complementary Metals: Champagne bronze, brushed brass, aged bronze, polished nickel, and matte black.

• Lighting Recommendation: Grazing light emphasizes the varying stone depths and produces soft architectural shadows.

Frequently Asked Questions

Is this sold as a flat panel?

No. It is a preassembled L-shaped corner designed to wrap 90-degree outside corners.

Is the corner 9" × 18" or 9" × 12" × 6"?

Both descriptions refer to the same configuration. MSI markets it as 9" × 18" because the 12-inch and 6-inch returns total 18 inches.

What is the correct SKU?

The correct Royal Cream 3D Honed corner SKU is LPNLMROYCRE918COR-3DH.

Which flat panel matches this corner?

It coordinates with Royal Cream 3D Honed 9" × 24" marble ledger panels, SKU LPNLMROYCRE924-3DH.

Can I use the standard Royal Cream corner instead?

No. The standard version has a rough splitface surface and will not match the smooth 3D Honed texture.

How many corner pieces are packaged in a carton?

A standard carton contains four corner pieces covering approximately 4.50 square feet or three vertical linear feet of one corner.

Does it require grout?

It is designed for a tight-joint stacked-stone installation with minimal visible grout.

Can it be installed outdoors?

Yes, when installed using an approved exterior veneer system with proper waterproofing, flashing, drainage, mortar coverage, and movement accommodation.

Can it be used on floors?

No. This dimensional corner panel is intended exclusively for vertical surfaces.

Should the marble be sealed?

Sealing may be beneficial in exterior, grease-, moisture-, or stain-prone areas. Test a penetrating marble sealer before treating the complete installation.