{"product_id":"msi-6x18-cosmic-white-stacked-stone-corner-piece","title":"MSI 6x18 Cosmic White Stacked Stone Corner Piece","description":"\u003cdiv class=\"markdown markdown-main-panel enable-luminous-fast-follows enable-updated-hr-color md-content stronger tutor-markdown-rendering\" id=\"model-response-message-contentr_afae0871a82b77fa\" dir=\"ltr\"\u003e\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003e\u003cb\u003eMSI Cosmic White 6\" x 18\" Stacked Stone Corner Panel\u003c\/b\u003e is an L-shaped pre-assembled natural marble corner piece designed specifically to accompany the \u003ci\u003eCosmic White 6\" x 24\" Flat Ledger Panels\u003c\/i\u003e from MSI’s Rockmount™ Collection. Engineered for outside 90-degree corners, this specialty piece features an L-shaped interlocking format that wraps seamlessly around structural edges, fireplace breasts, and exterior columns without exposing cut stone edges or requiring manual 45-degree miter cuts on-site.\u003c\/p\u003e\n\u003cp\u003eFeaturing the signature \u003ci\u003eCosmic White\u003c\/i\u003e aesthetics, each panel showcases a split-face natural marble body with crisp white tones, subtle cream undertones, and light-reflecting quartz sparkles.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTechnical Property\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eValue \/ Specification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard \/ Compliance\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eManufacturer \/ Brand\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMSI Surfaces (MSI)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRockmount™ Stacked Stone Collection\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eColor Name \/ SKU\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCosmic White Corner (LPNLMCOSWHI618COR)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSplit-Face Natural Marble\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003ePanel Format \/ Profile\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eL-Shaped Corner (6\" Height x 12\" Long Arm \/ 6\" Short Arm)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePre-Assembled 90° Corner\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eThickness\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.75\" to 1.25\" (~19 mm to 32 mm Variable Depth)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDimensional Ledger Profile\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eSurface Finish\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSplit-Face \/ Split-Stone (Raw Textured Surface)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNatural Rough Face\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eMaterial Type\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e100% Authentic Natural Marble\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNatural Metamorphic Stone\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eWater Absorption\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLow (Varies by natural stone density)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eASTM C97\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eFrost Resistance\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eFreeze-Thaw Resistant (Properly Sealed)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eASTM C1026\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eGrout Requirement\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eGroutless Installation (Dry-Stacked Look)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eButt-Joint Interlocking Corner\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eApplications\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOutside Fireplace Corners, Exterior Columns, Retaining Wall Corners, Bar Edges\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eInterior \u0026amp; Exterior Vertical Walls ONLY\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eRecommended Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eFireplace Surrounds \u0026amp; Chimney Breasts:\u003c\/b\u003e Wraps smoothly around outside 90-degree corners of fireplaces and mantels for a continuous stone slab look.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eExterior Architecture \u0026amp; Hardscapes:\u003c\/b\u003e Exterior wall corners, patio pillars, retaining wall ends, and outdoor kitchen islands.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eInterior Architectural Features:\u003c\/b\u003e Bar corners, accent wall wraps, and reception desk returns.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation and Handling Guidelines\u003c\/h2\u003e\n\u003ch3\u003e⚠️ CRITICAL WARNING: CORNER INSTALLATION PROTOCOL\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eInstall Corners First:\u003c\/b\u003e When cladding walls with outside 90-degree angles, \u003cb\u003ealways set the 6x18 corner pieces first\u003c\/b\u003e, working from the bottom corner upward. Once corners are set, interlock the standard 6x24 flat ledger panels outward across the remaining wall space.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eAlternating Corner Orientation:\u003c\/b\u003e Rotate the L-shaped corner panels 180 degrees with each progressive row (alternating long-side-left and long-side-right) to stagger vertical joint seams down the corner edge.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eMortar Selection \u0026amp; Color:\u003c\/b\u003e Set corner panels using an ANSI A118.4 \/ A118.15 polymer-modified Large \u0026amp; Heavy Tile (LFT) thinset. Always use \u003cb\u003epure white thinset mortar\u003c\/b\u003e to prevent dark mortar lines along white marble edges.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eGroutless Dry-Stack System:\u003c\/b\u003e Corner pieces fit tightly butt-jointed against adjacent flat panels. Do NOT apply grout into the textured split-face surface.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProfessional Recommendations\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSubstrate Preparation:\u003c\/b\u003e Ensure corner substrates (backer board, cement block, or concrete wall) are plumb, 90 degrees square, and structurally capable of supporting \u003cb\u003e8 to 11 lbs per square foot\u003c\/b\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSealing Strategy:\u003c\/b\u003e Protect against outdoor weathering, dust, and moisture by applying a premium solvent-based penetrating natural stone sealer (such as Miracle Sealants 511 Impregnator or StoneTech® BulletProof®) after full installation cure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCare and Maintenance\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eRoutine Cleaning:\u003c\/b\u003e Dust lightly with a soft brush or vacuum attachment. Clean dirt or surface marks using warm water and a pH-neutral stone cleaner.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eAvoid Acidic Cleaners:\u003c\/b\u003e Never use vinegar, bleach, acidic chemical cleaners, or high-pressure power washers at close range on natural marble.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eResealing Schedule:\u003c\/b\u003e Reapply a penetrating stone sealer every \u003cb\u003e2 to 3 years\u003c\/b\u003e on exterior corners or high-touch interior surfaces.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eDesign Profile\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eAesthetic Integration:\u003c\/b\u003e Color and texture matched to pair perfectly with MSI's 6\" x 24\" Cosmic White Flat Ledger Panels.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eArchitectural Finish:\u003c\/b\u003e Eliminates unsightly open cut edges, exposed tile sides, or tedious hand-mitering on job sites.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eLighting Interaction:\u003c\/b\u003e Multi-depth split-face texture catches ambient side-lighting and spotlighting across 90-degree corner boundaries.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhy should I buy 6x18 corner pieces instead of mitering 6x24 flat panels?\u003c\/h3\u003e\n\u003cp\u003ePre-assembled L-corner pieces save significant labor time on site and create a factory-finished 90-degree transition. Hand-mitering split-face stone with variable thickness is extremely difficult and often results in chipped, uneven edges along outside corners.\u003c\/p\u003e\n\u003ch3\u003eHow do the corner pieces interlock with 6x24 flat panels?\u003c\/h3\u003e\n\u003cp\u003eThe ends of the 6x18 corner panels feature the same Z-shaped interlocking fingers as the 6x24 flat panels, allowing flat panels to slide directly into the corner piece without visible joint breaks.\u003c\/p\u003e\n\u003ch3\u003eDo corner pieces require grouting?\u003c\/h3\u003e\n\u003cp\u003eNo. Just like the flat ledger panels, corner pieces are designed for a groutless, dry-stacked look.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"heytiles","offers":[{"title":"Default Title","offer_id":38304822526146,"sku":"LPNLMCOSWHI618COR","price":58.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0514\/5719\/6226\/products\/msi-6x18-cosmic-white-stacked-stone-corner-piece-829027.jpg?v=1738863066","url":"https:\/\/heytiles.com\/products\/msi-6x18-cosmic-white-stacked-stone-corner-piece","provider":"Hey Tiles","version":"1.0","type":"link"}