15 mm Slabs
Commonly used for wall cladding, vertical backing, or light furniture tops where minimizing weight is the priority. Requires solid backing support and is not recommended for heavy kitchen countertop spans.
Granite Slab Thickness Guide
Selecting the right thickness for your granite slabs is critical for structural integrity, load-bearing capacities, and project aesthetics. Here is a comparison of standard stone thicknesses for Bangalore homes.
20 mm Slabs
RecommendedThe premium standard for kitchens, bathroom vanities, and indoor flooring. Balances high flexural strength with manageable slab weight, lowering transportation risk and making fabrication (like edge profiling) highly efficient.
30 mm Slabs
Ideal for self-supporting cantilevers, unsupported kitchen islands, outdoor steps, and heavy architectural details. Does not require a plywood sub-base but adds massive static weight to cabinetry structures.
Thickness Selection Checklist
- Support Framework: Standard modular kitchens are built for 20mm slabs. If choosing 30mm, ensure structural cabinet framing is reinforced.
- Overhang Length: For kitchen countertops or bar tops with an overhang exceeding 10 inches, choose 30mm or reinforce 20mm slabs with brackets.
- Edge Profiling: Full bullnose, bevels, and mitered joints are easiest and cleanest to execute on standard 20mm granite.
- Flooring & Stairs: Main entrance stairs and high-traffic commercial treads benefit from the raw impact absorption of 30mm stones.
Weight and Handling Factors
Granite weighs approximately 75 kg per square meter at 30mm thickness, compared to 50 kg per square meter at 20mm. Higher weights complicate manual carrying up high-rise buildings and require stronger structural sub-floors.
Edge Profile Build-ups
If a 40mm thick edge is desired for visual impact, fabricators typically cement two pieces of 20mm granite with a mitered joint rather than using a full 40mm slab, keeping weight low while retaining the luxury look.
Reviewed By
Neelesh Raj Solanki, Hanuman & Mahendra Samtiya Deagana. Last reviewed: May 2026.
Neelesh Raj Solanki
Founder & Stone Industry Specialist
Slab sourcing, quality checks, and material consultation.
Hanuman & Mahendra Samtiya Deagana
Senior Stone Operations & Installation Support
Structural support guidelines, installation, and fabrication.
Expertise & Transparency
This guide is reviewed by SGS specialists and tied to real showroom workflows.
Author bios
Neelesh Raj Solanki
Founder & Stone Industry Specialist
Slab sourcing, quality inspection, material consultation, and project guidance.
Hanuman & Mahendra Samtiya Deagana
Senior Stone Operations & Installation Support
Fabrication workflows, installation handling, and delivery coordination.
Vivek Jain
Web Application Developer & Digital Catalogue Operations
Product data management, technical SEO coordination, and catalogue structuring.
Editorial policy
- Content is reviewed by the SGS showroom team for accuracy before publishing.
- Updates occur when new stock arrives, finishes change, or pricing inputs shift.
- Buyer guidance focuses on real project constraints, not keyword templates.
Sourcing transparency
- Inventory references are based on SGS showroom stock checks and supplier catalogs.
- Pricing guidance reflects typical ranges by grade, finish, and slab thickness.
- Maintenance and installation notes come from project handoff feedback and on-site visits.