Product Overview

MSI XL RockMount Sierra White 9" x 24" Splitface Marble Ledger Panel Wall Tile brings crisp white coloration, dimensional natural texture, and large-scale architectural character to interior and exterior walls. Part of MSI’s XL RockMount® Collection, each oversized panel is assembled from genuine marble strips with a rugged splitface surface.

The Sierra White palette features cool, clean white tones with subtle natural veining and crystalline variation. Directional lighting accentuates the stone’s uneven relief, creating shifting highlights and shadows across fireplaces, feature walls, columns, exterior façades, and outdoor living areas.

Each nominal 9" x 24" panel covers approximately 1.50 square feet. Interlocking ends minimize visible seams and create the appearance of individually stacked stone without requiring traditional face grouting. Matching 9" x 18" L-shaped corner panels are available for outside corners and columns. MSI confirms that Sierra White XL is splitface marble intended for interior and exterior vertical applications. MSI Surfaces

Technical Specifications

Natural marble varies in shade, veining, mineral markings, texture, thickness, and surface relief. Dimensions, weights, and coverage are nominal.

Recommended Applications

• Fireplace Surrounds: Creates a bright floor-to-ceiling stone feature with substantial dimensional character.

• Living-Room Feature Walls: Adds natural texture behind televisions, shelving, artwork, and built-in cabinetry.

• Kitchen and Bar Accent Walls: Introduces a cool-white marble backdrop behind counters, beverage stations, and entertainment areas.

• Entryways and Reception Areas: Gives residential foyers, hotels, offices, and retail interiors a crisp architectural surface.

• Exterior Façades: Suitable for properly designed exterior cladding, building accents, and entrance features.

• Columns and Support Structures: Coordinates with matching L-shaped corners to create continuous stacked-stone coverage.

• Outdoor Kitchens: Provides natural-stone facing around approved grill islands and outdoor kitchen structures.

• Retaining-Wall Veneers: Adds dimensional marble texture to properly constructed and waterproofed vertical wall surfaces.

• Bathroom and Spa Features: Suitable for appropriate vanity backdrops and decorative walls with complete moisture management.

Installation and Handling Guidelines

Important: Heavy Natural-Stone Wall Installation

• Confirm Structural Capacity: The wall assembly must support the combined weight of the marble panels, setting mortar, and substrate.

• Use a Suitable Substrate: Install over properly prepared concrete, masonry, mortar beds, or cementitious backer board as appropriate for the application.

• Prepare a Flat Surface: XL ledger panels require a clean, rigid, plumb, and sufficiently flat substrate to prevent open joints and panel misalignment.

• Install Corners First: When matching 9" x 18" L-shaped corners are used, establish them first and install the flat panels outward from each corner.

• Use White Natural-Stone Mortar: Select a premium white large-and-heavy-tile mortar approved for marble, vertical installations, and the intended substrate.

• Verify Mortar Compatibility: Follow the mortar manufacturer’s recommendations for natural stone, exterior exposure, fireplaces, and wet environments.

• Back-Butter the Panels: Apply mortar to the backs of the panels as necessary to achieve proper contact and complete support.

• Maintain Tight Joints: Fit adjoining panels closely together to preserve the intended grout-free stacked-stone appearance.

• Stagger Vertical Seams: Arrange adjoining rows so vertical panel joints do not align and panel boundaries remain less noticeable.

• Dry-Lay and Blend: Arrange panels from several cases before installation to distribute shade, veining, and texture evenly.

• Provide Movement Joints: Include movement accommodation according to applicable building and tile-industry standards. Never bridge structural movement joints.

• Waterproof Exterior and Wet Areas: Provide the required drainage plane, flashing, waterproofing, and moisture-management system behind the marble.

• Protect Horizontal Surfaces: Exterior walls and columns require properly sloped caps or flashing to keep water from entering behind the veneer.

• Follow Fireplace Clearances: Suitable for fireplace surrounds but not automatically approved inside a firebox. Follow the fireplace manufacturer’s clearance and substrate requirements.

• Cut Only with Wet Methods: Use a wet saw and appropriate respiratory protection. Do not dry-cut, grind, or polish materials that can release respirable crystalline-silica dust.

Care and Maintenance

• Remove loose dust using a soft brush, microfiber duster, or vacuum attachment.

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

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

• Do not direct high-pressure washing equipment at close range toward the stone or panel joints.

• Apply a penetrating natural-stone sealer when appropriate for the environment and desired stain protection.

• Test the sealer on spare material first to confirm that it does not alter the marble’s cool-white color.

• Inspect exterior installations periodically for loose pieces, open joints, failed sealant, or potential water-entry points.

Design Profile

• Style: Modern organic, contemporary coastal, Scandinavian, Alpine luxury, and minimalist.

• Visual Character: Cool-white marble strips with naturally varied veining, crystalline detail, and splitface relief.

• Format Advantage: The 9" x 24" XL format covers more wall area and creates a larger architectural scale than conventional 6" x 24" ledger panels.

• Lighting Advantage: Directional wall washing emphasizes the varied stone depths and produces soft highlights and shadows.

• Coordinating Materials: White oak, walnut, concrete, blackened steel, glass, and cool-gray porcelain.

• Coordinating Fixtures: Matte black, brushed nickel, polished chrome, and champagne bronze.

• Recommended Wall Colors: Warm white, pale gray, greige, charcoal, and muted natural tones.

Frequently Asked Questions

Is MSI Sierra White XL made from marble or quartzite?

Sierra White XL is made from genuine natural marble. Product descriptions identifying this colorway as quartzite are incorrect.

How much area does one panel cover?

Each nominal 9" x 24" panel covers approximately 1.50 square feet.

How much material is packaged in one case?

A case contains three panels and covers approximately 4.50 square feet.

How is the XL panel different from a standard ledger panel?

The XL panel measures 9" high rather than the conventional 6" height. It provides greater coverage and creates a larger visual scale across fireplaces, façades, and expansive feature walls.

Which corner matches the Sierra White field panel?

The coordinating product is the Sierra White XL 9" x 18" L-shaped corner, manufacturer item number LPNLMSIEWHI918COR.

Does Sierra White ledger panel require grout?

The panels are designed to fit tightly together for a stacked-stone appearance. Face grouting is generally not required, although mortar is necessary to bond the panels securely to the substrate.

Should corner pieces or field panels be installed first?

Install the corner pieces first. After confirming that the corners are level and plumb, install the 9" x 24" flat panels outward from them.

Can Sierra White XL be installed outdoors?

Yes. MSI lists Sierra White for exterior vertical applications. Proper substrate preparation, exterior-rated mortar, flashing, drainage, waterproofing, movement joints, and climate-appropriate installation are required.

Can it be installed in freeze-thaw climates?

It may be used in approved exterior installations when the complete assembly is designed for freeze-thaw exposure. Water must not be allowed to accumulate behind or above the stone.

Can it be installed around a fireplace?

Yes. It is suitable for properly constructed fireplace surrounds. It should not be installed inside the firebox unless the complete assembly is specifically approved for that use.

Can Sierra White be installed on shower walls?

It may be used for certain shower-wall applications, but its textured surface is more difficult to clean than smooth tile. Complete waterproofing and compatible natural-stone installation materials are required.

Does Sierra White marble require sealing?

A penetrating sealer is recommended where the marble may encounter moisture, grease, staining, or exterior exposure. Always test the sealer first.

Can the panels be used as flooring?

No. MSI classifies Sierra White XL as a vertical wall product and does not recommend it for residential or commercial floors.

Will every panel look identical?

No. Genuine marble naturally varies in color, veining, crystalline markings, texture, thickness, and surface relief.

How much extra material should be ordered?

Order at least 10% additional material for cutting, breakage, shade blending, and future repairs. Projects with numerous corners or detailed cuts may require approximately 15% overage.