GSB (Granular Sub-Base)

GSB is a designed blend of crushed stone, gravel and fines that meets MoRTH grading requirements. It sits between the sub-grade and the base course and does the twin job of spreading load and draining water away from the pavement.

Because GSB is a specification rather than a single material, what matters when you buy is the grading curve, the plasticity index of the fines and the CBR value it achieves after compaction.

Typical units: tonne, cum. Priced per cubic metre or tonne; grading compliance is worth a small premium.

• Road and highway sub-base
• Industrial hardstanding and yards
• Parking areas and internal site roads
• Base preparation for paver block areas

Grading I / II

Coarser blends for thicker single-layer sub-bases.

Grading III / IV

Finer blends, close-graded, common for lighter pavements.

• Ask for a sieve analysis against the MoRTH table you are specifying — a load that looks right can still be out of grading.
• Check the liquid limit and plasticity index of the fines; plastic fines destroy the drainage function.
• Compact in 150–200 mm layers to the specified density and test before the base course goes on.

• Verified suppliers only — every shop is checked before it can list.
• Live per-unit rates you can compare across suppliers in your city.
• GPS-tracked delivery from dispatch to site gate.
• GST invoices and digital payment records for every order.

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