GSB (Granular Sub-Base) is a well-graded mixture of crushed stone aggregate, gravel, and fine material conforming to MORTH (Ministry of Road Transport and Highways) specifications. Used as the structural layer beneath road surfaces, pavements, industrial floors, and heavy-duty concrete slabs. GSB distributes load from the pavement to the subgrade, provides drainage, and prevents subgrade failure under traffic loads. Essential for all road construction projects in Tamil Nadu.
Available in bulk supply across Chennai, Chengalpattu, Kanchipuram, Thiruvallur, and all of Tamil Nadu. Delivered directly to your construction site in 24–48 hours. GST invoice provided on every order.
| Material | Granular Sub-Base (GSB) |
| Standard | MORTH Specification — Table 400-1 Grading I/II |
| Max Particle Size | 75mm |
| Grading | Well-graded (coarse + fine blended) |
| CBR Value (Min) | > 30% |
| Liquid Limit | < 25% |
| Plasticity Index | < 6% |
| Compaction | 98% MDD (ISI:2720 Part 7 / 8) |
| Supply Unit | Per Load / Per Cubic Metre |
- ✓MORTH-compliant — accepted for all government road projects
- ✓Well-graded for excellent load distribution under roads
- ✓Good drainage — prevents subgrade weakening in rains
- ✓Consistent blend of coarse and fine fractions
- ✓Supplied with lab test reports on request
Looking to buy GSB in Chennai at the best price? BuildingNeeds.in is an authorised aggregate and M-Sand supplier in Tamil Nadu. We supply GSB in bulk loads (per load of approx. 5–10 MT depending on product) across Chennai, Chengalpattu, Kanchipuram, and all surrounding districts. All products conform to relevant IS and MORTH specifications where applicable. GST invoice on every order.
Call or WhatsApp +91 63996 96363 for today's rate and same-day delivery confirmation.