Important product-data corrections: MSI markets this as a 6" × 18" corner because its 12" and 6" returns total 18". The actual L-shaped dimensions are 6" high × 12" long return × 6" short return. Current distributor specifications list 4 pieces / 3 sq. ft. per box, so the Hey Tiles value of 4 sq. ft. per box appears incorrect and should be verified against the physical carton before changing inventory. The unrelated Edward Martin link is still present and should be removed. MSI Philadelphia Stacked Stone, current Hey Tiles page, packaging reference

Product Overview

MSI RockMount® Philadelphia 6" x 12" x 6" Splitface Travertine Corner Ledger Panel creates a finished 90-degree transition for Philadelphia stacked-stone installations. Each preassembled L-shaped piece wraps naturally around columns, fireplace projections, exterior façades, outdoor kitchens, and other outside corners without exposing a flat saw-cut edge.

Crafted from genuine natural travertine, Philadelphia blends creamy beige, warm ivory, soft gold, taupe, and subtle chocolate-brown tones. Its rugged splitface surface produces dimensional shadow and natural masonry character while coordinating directly with the Philadelphia 6" x 24" flat ledger panel.

Technical Specifications

Understanding the Dimensions

The two common size descriptions refer to the same corner piece:

• The corner is 6 inches high.

• One return extends approximately 12 inches.

• The second return extends approximately 6 inches.

• The two returns total 18 inches, which is why MSI markets it as a 6" x 18" corner panel.

This product is designed for a 90-degree outside corner and is not a flat 6" x 18" panel.

Recommended Applications

• Fireplace Surrounds: Wraps fireplace projections and chimney-breast corners with a continuous stacked-stone appearance.

• Columns and Pillars: Creates finished outside corners without exposed flat-panel cuts.

• Exterior Façades: Suitable for entry walls, architectural projections, columns, and approved exterior veneer assemblies.

• Outdoor Kitchens: Finishes barbecue islands, bar structures, counters, and entertainment features.

• Interior Feature Walls: Adds warm natural texture to living rooms, foyers, dining rooms, offices, and hospitality interiors.

• Shower and Tub Walls: May be installed over a complete waterproofing system where the dimensional splitface surface is appropriate for maintenance requirements.

• Fountains and Water Features: Suitable for approved vertical water-feature applications using installation materials designed for continuous moisture exposure.

• Landscape Features: Can be used as a decorative veneer over structurally sound masonry walls, planters, and architectural elements. It is not a structural retaining-wall material.

Installation Guidelines

⚠️ IMPORTANT: INSTALL CORNERS BEFORE FLAT PANELS

Establish and install the corner courses first. The matching Philadelphia 6" x 24" flat panels can then be measured, cut, and fitted into the corner returns.

• Alternate Each Course: Rotate successive corner pieces so the 12" and 6" returns alternate between adjoining walls. This staggers the joints and creates a more natural masonry appearance.

• Approved Substrate: Install over clean, flat, structurally sound concrete, masonry, or properly secured cementitious backer board. Painted drywall is not appropriate for heavy, wet, exterior, or high-heat applications.

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

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

• Grout-Free Appearance: Fit adjoining panels tightly without conventional grout joints. Remove exposed mortar from the stone faces and joints before it hardens.

• Course Alignment: Maintain consistent 6" horizontal courses so the corner pieces align with the coordinating Philadelphia flat panels.

• Dry-Lay and Blend: Arrange material from several cartons before installation to distribute lighter, darker, and more heavily textured pieces.

• Wall Flatness: Correct substrate irregularities before installation. Do not use excessive mortar thickness to compensate for severely uneven walls.

• Wet Areas: Install over a complete waterproofing system. Sealing the travertine does not waterproof the wall assembly.

• Exterior Installation: Provide appropriate flashing, drainage, waterproofing, freeze-thaw-rated setting materials, and movement accommodation.

• Fireplace Installation: Follow the fireplace manufacturer’s clearance requirements and all applicable building codes. Natural stone alone does not make an improperly constructed wall assembly heat-safe.

• Movement Joints: Include perimeter and field movement joints according to TCNA EJ171 and applicable construction requirements.

• Cutting Safety: Wet-cut with a diamond blade designed for natural stone. Do not dry-cut or grind because the process can release hazardous respirable crystalline-silica dust.

• Order Allowance: Purchase approximately 10–15% additional material for cuts, breakage, color blending, and future repairs.

Quantity Calculation

Each corner piece covers approximately 6 vertical inches, so two pieces are required for every vertical foot of one corner.

Calculate each outside corner separately, combine the required pieces, and then add approximately 10–15% for waste and future repairs.

Care and Maintenance

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

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

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

• Apply a penetrating natural-stone sealer in wet, exterior, grease-prone, or stain-prone locations.

• Test enhancing sealers before application because they may deepen the beige, gold, and chocolate coloration.

• Travertine may contain natural pits and voids. These are characteristic of the stone and may occasionally require compatible filler or maintenance.

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

Natural Stone Variation

Philadelphia is genuine natural travertine. Differences in color, pores, pits, veining, texture, and splitface depth are expected. Individual pieces may range from light ivory and cream to warm beige, gold, taupe, and chocolate brown.

Open several cartons and blend the material before installation. Natural variation is an inherent characteristic and is not considered a manufacturing defect.

Design Profile

• Aesthetic Inspiration: Mediterranean, Tuscan, old-world, rustic contemporary, organic transitional, and California casual.

• Color Character: Creamy beige and warm ivory with soft gold, taupe, and chocolate accents.

• Visual Advantage: The L-shaped construction allows the stacked-stone pattern to wrap around outside corners without exposed saw-cut edges.

• Complementary Materials: Cream limestone, ivory travertine, white oak, walnut, warm stucco, plaster, and textured concrete.

• Complementary Metals: Aged bronze, oil-rubbed bronze, brushed brass, matte black, and antique copper.

• Lighting Recommendation: Grazing light from above or below emphasizes the dimensional splitface surface and layered stone construction.

Frequently Asked Questions

Is the Philadelphia corner made from genuine travertine?

Yes. It is a natural splitface travertine corner panel with creamy beige, ivory, gold, taupe, and chocolate coloration.

Is the size 6" x 18" or 6" x 12" x 6"?

Both descriptions refer to the same product. It is 6" high with 12" and 6" returns. The combined returns total 18", which is why it is marketed as a 6" x 18" corner.

What is the correct SKU?

The MSI manufacturer item number is LPNLTPHI618COR.

How many pieces are needed per vertical foot?

Two pieces are required for each vertical foot because every corner panel is approximately 6" high.

How many pieces are packaged in one box?

Current distributor specifications list four pieces per box, covering approximately 3 sq. ft. of surface area or 2 vertical feet of one corner. Verify the current carton before ordering because packaging can change.

Does this corner panel require grout?

No conventional grout joint is normally used. RockMount ledger panels are fitted tightly together to create a grout-free stacked-stone appearance.

What flat panel coordinates with this corner?

It coordinates with the MSI Philadelphia 6" x 24" Splitface Travertine Ledger Panel, item number LPNLTPHI624.

Can it be installed outdoors?

Yes, when installed as part of an approved exterior veneer assembly with proper waterproofing, flashing, drainage, mortar coverage, and movement accommodation.

Can it be installed around a fireplace?

Yes, provided the complete installation complies with the fireplace manufacturer’s clearance requirements, substrate specifications, and local building codes.

Does Philadelphia travertine require sealing?

Sealing is recommended in wet, exterior, grease-prone, or stain-prone locations. Test the sealer first because some products may deepen the stone’s color