Thassos White Marble 1x12 Quarter Round Trim Polished or Honed (A1)

Thassos White Marble quarter-round trim 1x12, polished & honed finish, Tilehouz

Thassos White Marble 1x12 Quarter Round Trim Polished or Honed (A1)

Finish
Regular price $20.99
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5 UNIT MINIMUM PURCHASE REQUIRED

Size chart

 TILE DIMENSIONS 

1 TILE COVERS

12X12

1 sq ft / priced per piece

16X16

1.77 sq ft / priced per piece

12X24

2 sq ft / priced per piece

18X18

2.25 sq ft / priced per piece

24X24

4 sq ft / priced per piece

18X36

4.5 sq ft / priced per piece

ODD SIZED MOSAICS 1 SHEET COVERS
Mini Herringbone 0.86 sq ft / priced per sheet
1X2 Herringbone 0.85 sq ft / priced per sheet
1x3 Herringbone 1 sq ft / priced per sheet
1X4 Herringbone 0.92 sq ft / priced per sheet
1X6 Herringbone 0.94 sq ft / priced per sheet
1" Hexagon 0.85 sq ft / priced per sheet
2" Hexagon 1 sq ft / priced per sheet
3" Hexagon 0.80 sq ft / priced per sheet
4" Hexagon 0.56 sq ft / priced per sheet
5" Hexagon 0.90 sq ft / priced per sheet
6" Hexagon 0.84 sq ft / priced per sheet
10" Hexagon 0.60 sq ft / priced per sheet
5" Combo Hexagon 0.70 sq ft / priced per sheet
Vortex Hexagon 1.16 sq ft / priced per sheet
Manhattan/Random Strip 0.90 sq ft / priced per sheet
Octave 0.90 sq ft / priced per sheet
Triple Weave 0.80 sq ft / priced per sheet
Florita 1.17 sq ft / priced per sheet
Berlinetta 0.80 sq ft / priced per sheet
6" Arabesque/Lantern 0.62 sq ft/ priced per sheet
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Elevate transitions and edge details with the Thassos White Marble 1x12 Quarter Round Trim, offered in polished or honed finishes. Crafted to complement pure white marble surfaces, this quarter-round edge delivers a refined, seamless look that enhances any interior—from clean modern bathrooms to pristine kitchen backsplashes.

  • 1x12 quarter-round profile provides a gentle, rounded edge that protects tile corners while delivering a smooth tactile finish along floors, walls, and shower surrounds.
  • Two finish options — choose polished for a bright, reflective sheen or honed for a softer, satin-like matte appearance that pairs beautifully with matte tiles and contemporary fixtures.
  • Grade A1 quality ensures consistent color with minimal variation, giving your project a cohesive look across all trim pieces.
  • Natural marble durability— ideal for indoor use in bathrooms, kitchens, and entryways. Pair with a marble-safe sealer to maintain color clarity and guard against staining.
  • Versatile styling— a timeless white backdrop that coordinates with other Thassos collections and white surfaces for a clean, cohesive design language.
  • Installation-friendly— designed to work with standard marble thin-set mortars and grouts; seal after installation and follow care guidelines to preserve the marble’s luster.

Use cases and ideal applications

  • Shower enclosures and tub surrounds where a crisp edge finish enhances waterproofing aesthetics while preventing chipping on tile edges.
  • Kitchen backsplashes and island accents, delivering a polished border that mirrors the surrounding white marble for a monochrome, high-end look.
  • Floor perimeter transitions and wall-to-tloor details that require a durable, visually lightweight edge rather than a heavy trim profile.

What makes this trim special is its combination of pure Thassos white marble, a precise 1x12 footprint, and the choice between polished and honed surfaces. This trifecta creates a consistent, bright white edge with luxurious depth—without introducing busy veining or color shifts that can distract from a minimalist design. In short, it’s the subtle touch that elevates your tile work from finished to gallery-worthy.

Care and maintenance tips — protect the finish with a penetrating marble sealer after installation and re-seal as recommended. Clean with pH-neutral marble cleaners; avoid acidic or abrasive products that can etch or dull the surface. With proper care, the Thassos White Marble trim maintains its pristine glow for years.

Ready to complete your marble look with a flawless, edge-to-edge finish? Add the Thassos White Marble 1x12 Quarter Round Trim (A1) to your cart and experience the quiet luxury of true white marble in a practical trim profile.

Installation Guidelines

The owner or owner’s representative is responsible for determining the acceptability of the product prior to installation. All Installations should be done by a professional tile installer.

1. Measuring: Measure coverage area, make sure to purchase at least 10% extra material than is required. This will account for any breakage or mis-cuts during installation, and ensure you have extra material should you have to replace any tile elements in the future.

2. Verifying Dye Lot Consistency: The owner or end user is responsible for determining the acceptability of the product. Due to the handmade, artistic nature of our product, variation in color, shade, tone, and size is normal.

  •   Upon delivery, open and inspect each box of tile.
  •   Verify dye lot consistency in the following manner. To establish color control samples, randomlyselect 5 pieces from your order from different boxes.
  •   To assure shade variations are acceptable check, the remaining sheets or field tile in your order againstthe control samples, prior to installation.
  •   If ordering additional materials. Sample shall be sent to help attempt to match previously orderedmaterial.

3. Setting Material: Because of the translucent nature of glass, the color of the bonding material will impact the ultimate look of the tile. We highly recommend the use of white polymer modified white thin-set.

Acceptable Thin-Sets (White Color):

  •   CUSTOM BUILDING PRODUCTS: Premium Glass Tile Thin-Set Mortar
  •   BOSTIK: Glass-MateTM GLASS TILE MORTAR
  •   BOSTIK: ReFlex Ultra-Premium Latex Modified Thin-Set Mortar
  •   LATICRETE: Glass Tile Adhesive
  •   MAPEI: Adesilex P10 Bright White Thin-Set Mortar mixed With Keraply Mortar Additive
  •   TEC SPECIALTY PRODUCTS: Super Flex Premium Performance Universal Latex-Modified Thin-Set Mortar

Acceptable Grout:

  •   Custom Building Products Grout : Polyblend Sanded Grout
  •   Bostik: Dimensions & TruColor
  •   HYDROMENT: Sanded Tile Grout
  •   LATICRETE: 1500 Sanded Grout
  •   MAPEI: Keracolor S
  •   TEC: AccuColor Premium Sanded Tile Grout

4. Cutting: Plan the placement of the tiles on your wall prior to installation. If you need to cut a mosaic sheet, cut from the back using a utility knife between tiles along the grout joints. Should you need to cut across tiles in a fashion that is not possible with a utility knife, use a wet saw with a diamond blade to cut through the tile.

5. Drilling: Using a drill bit designed for glass is recommended. When drilling the hole, keep the bit and hole lubricated to prevent chipping. Start by drilling from both ends of the tile, starting with the back and drilling half the depth of the tile. Then, turn the tile over and complete the hole is recommended. This will prevent the glass from chipping as the drill bit exits the tile.

6. Applying Setting Materials:

 Apply setting material using the notched side of a V-notched trowel. Using the flat side of the trowels, smooth out all ridges to achieve a consistent, even 1/8” (3mm) coverage.

  •   Apply glass mosaic sheets, mesh -side down, firmly into freshly laid setting material. Mix and match from assorted sell units to achieve consistent variation. Using a rubber grout float gently press the tile into adhesive to ensure complete contact.
  •   Natural Stone should be sealed prior to grouting. A premium penetrating sealer is recommended for a natural look. Please refer to sealer manufacturer’s recommendations for application instructions.

7. Cleaning: Clean all excess grout immediately with a damp sponge. After 12 hours polish off any remaining haze with a dry cloth or towel. For tough stains, we require the use of PH Neutral cleaner to clean the tile and grout, such as Grout & Tile neutral cleaner.

Maintenance & Care

Required to use a soft bristle brush to scrub the tile surfaces and grout. Take care to only use a soft bristle brush, to avoid the chance of scratching or damaging the grout. Then, simply wipe the surface, rinse well with clean water, and dry with a soft clean towel.

Required to use PH Neutral Cleaner to clean the tile and grout, such as Grout & Tile Neutral Cleaner

Maintenance, Care & Cleaning (Marble and Natural Stone Products)

Cleaning marble surfaces requires gentle care as they are easily scratched and can be damaged by acidic substances.

1. **Regular Cleaning**: Dust the surface regularly with a soft, dry cloth. For a more thorough clean, use a damp cloth and a little mild soap. Make sure you thoroughly rinse the surface after to remove any soap residue and dry it with a soft towel to prevent water spots.

2. **Deep Cleaning**: You can buy a pH-neutral stone cleaner specifically designed for marble. Dilute the cleaner according to the instructions, then apply it to the marble. Use a soft, damp cloth or sponge to clean the surface. Rinite with clean water and wipe dry.

3. **Stain Removal**: If there's a stain, try to identify what caused it, as different types of stains require different treatments. In general, a poultice made from baking soda and water can help lift the stain. Apply the poultice to the stain, cover with plastic wrap, and leave it overnight. Clean off the poultice with water the next day and pat dry.

Remember not to use vinegar, lemon juice, or other cleaners containing acid on marble surfaces, as they can etch the marble surface. Also, avoid using abrasive cleaners or tools that might scratch the marble. It's always a good idea to test any cleaning method on a small, inconspicuous area first to ensure it doesn't damage the marble.

We strongly recommend customers to use a licensed tile contractor to do the tile installation and always use TCNA tile installation handbook as the installation guidance

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