Key Specifications

Prefabricated Sizes and Thickness

• Standard Thickness: 2 cm (3/4 inch) for robust support without bulk
• Common Lengths: Cut to match standard window widths
• Depths (Front to Back): Range from 10 cm to 20 cm (4 to 8 inches) for a precise fit

Surface Finishing Options

• Polished: Glossy, sleek finish enhancing natural colors and patterns, ideal for high-end aesthetics
• Honed: Matte finish less prone to scratches, offering a subtle, elegant look
• Flamed or Brushed: Textured surface with increased slip resistance, suitable for high-traffic areas

Installation Guide

Site Preparation

• Measure and Clean: Ensure window opening is clean, dry, and debris-free; measure precisely to avoid gaps
• Level the Surface: Use a spirit level; apply self-leveling compound or shims if uneven
• Support Structure: Verify window frame sturdiness; add temporary supports (e.g., wood blocks) for heavy sills

Tools Needed

• Measuring tape and pencil
• Spirit level
• Diamond-tipped blade saw (wet saw recommended)
• Rubber mallet
• Notched trowel
• Caulking gun
• Safety gear: gloves, goggles, dust mask

Materials Required

• Adhesive: High-strength construction adhesive or thin-set mortar (avoid acidic products)
• Sealant: Silicone-based caulk in clear or grey
• Shims: Plastic or wood for leveling
• Backer Rod: For large gaps
• Clean Cloths: For wiping excess adhesive or sealant

Installation Steps

1. Cut to Size: Measure and cut marble using a wet saw with diamond blade; score surface first for precision
2. Dry Fit: Place sill in position; adjust with shims as needed
3. Apply Adhesive: Spread thin, even layer on window sill base using notched trowel
4. Set the Marble: Lower sill onto adhesive; tap gently with rubber mallet to level
5. Secure and Cure: Add temporary supports; let adhesive cure for 24 hours
6. Seal Edges: Apply silicone caulk along seams between sill and wall/window frame; smooth with wet finger or tool
7. Final Clean: Wipe excess adhesive or caulk with damp cloth; polish surface with soft cloth

Pro Tips

• Test adhesive on a small marble piece first to avoid staining
• For outdoor sills, use UV-resistant sealant to prevent yellowing
• Pre-sealed, but yearly reseal recommended for long-lasting beauty

Care Instructions

• Clean with mild, pH-neutral cleaner and soft cloth
• Avoid abrasive cleaners or acidic substances
• Reseal periodically to maintain appearance and longevity

Transform your space with the timeless appeal of these decorative grey marble window sills—where natural stone meets practical design.

Why Choose APEXSTONE?

Unmatched Expertise & Global Scale

Since 2002, we have evolved into a trusted global leader, supplying premium natural and engineered stone to luxury projects across 42+ countries. Our deep expertise ensures flawless execution for residential complexes, commercial towers like hotels and shopping centers, and prestigious public spaces such as airports and museums.

End-to-End Project Support & Innovation

From pre-sale technical consultation and CAD visualization to custom fabrication using advanced CNC and hand-finishing, we partner closely with architects and builders. Our proprietary StoneGPS platform enables precise material matching from over 2400 certified varieties and real-time inventory tracking for efficient logistics.

Sustainable Sourcing & Assured Quality

We ethically source from certified quarries worldwide and maintain ISO-certified production. Coupled with our integrated global supply chain from China's stone hub, we guarantee durable materials, on-time delivery for any project scale, and dedicated post-installation maintenance support.