GSB — Granular Sub-Base to MoRTH Section 401
Close-graded or drainage-graded sub-base for highways, layouts and yards.
ஜிஎஸ்பி (சாலை அடித்தள கலவை) — MoRTH 401 தரம், நெடுஞ்சாலை மற்றும் லேஅவுட் சாலைகளுக்கு.
Granular sub-base is the first structural layer of a road or hardstanding — the drainage-cum-sub-base course that sits on the compacted subgrade under WMM. MoRTH Section 401 defines six gradings: I, II, V and VI are close-graded for bearing; III and IV are open-graded drainage layers. NH designs typically call for 150–200 mm of GSB under 250 mm of WMM.
We blend GSB from crusher-run fractions and fines to the grading your contract specifies — Grading II (53 mm down) is the common choice for state and layout roads, Grading I (75 mm down) for heavier highway packages — and issue a gradation certificate per lot. Rock from the same Perindesam deposit has been source-approved by the supervision consultant for GSB, WMM and bituminous works on the Chennai Peripheral Ring Road.
A kilometre of two-lane road with 200 mm of compacted GSB needs about 3,000 MT — roughly 160 tipper loads — which is why we schedule GSB as a weekly convoy against your programme rather than load by load.
Where GSB (Granular Sub-Base) is used
- Sub-base layer under WMM on national and state highways, CPRR and bypass packages
- Base for layout roads, SIPCOT/industrial estate roads and warehouse yards
- Drainage layer (Gradings III/IV) beneath pavements and in reclaimed ground
- Paver-block and hardstanding base (150 mm)
- Backfill behind abutments and retaining structures where specified
Specification
| Gradings (MoRTH Table 400-1) | I: 75 mm down · II: 53 mm down (53 mm 100 · 26.5 mm 70–100 · 9.5 mm 50–80 · 4.75 mm 40–65 · 2.36 mm 30–50 · 0.425 mm 10–25 · 0.075 mm 3–10) · III/IV: open-graded drainage · V/VI: close-graded |
| Physical (MoRTH Table 400-2) | Soaked CBR ≥ 30 · LA abrasion ≤ 40% · impact value ≤ 30% · liquid limit ≤ 25 · plasticity index ≤ 6 · sand equivalent ≥ 50 |
| Loose bulk density | ≈ 1.60–1.80 t/m³ loose (2.1–2.25 compacted) → 1 unit ≈ 4.5–5.1 MT |
| Quantity rule | MT ≈ length × width × compacted thickness × 2.2; loose m³ ≈ compacted m³ × 1.25 |
| Sold by | Weighbridge tonne; gradation certificate per lot; convoy scheduling for packages |
Produced to IS 383:2016 gradings (M-Sand Zone II, P-Sand to IS 1542, GSB/WMM to MoRTH Section 400). Gradation, silt, crushing value and flakiness are tested through accredited third-party laboratories; certificates accompany every bulk contract.
GSB (Granular Sub-Base) price per tonne
Our indicative ex-works rate for GSB (Granular Sub-Base) is ₹425 per MT at the Perindesam gate, excluding royalty, transport and 5% GST. That is ~₹2,040 per unit (100 cft ≈ 4.8 MT) or ~₹20 per cft, ex-works. Indicative ex-works (gate) rates, excluding royalty, transport and 5% GST; confirmed at the time of order. Use the estimator for a delivered figure for your area, or send the quantity and site on WhatsApp.
GSB (Granular Sub-Base) delivered price by area
Delivered price (incl. 5% GST) = ex-works ₹425 per MT + the indicative transport for each area + 5% GST. Royalty and levies are itemised separately at actuals. 1 unit = 100 cft ≈ 4.8 MT of GSB (Granular Sub-Base); a 10-wheeler carries about 18 MT. Each area links to its own GSB (Granular Sub-Base) price page.
| Delivery area | Delivered price / ton (incl. GST) | Delivered / unit (100 cft) | Delivered / cft | Delivered / 18 MT load | of which transport / ton |
|---|---|---|---|---|---|
| Chennai | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~90 km |
| Gummidipoondi | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~82 km |
| Ponneri | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~85 km |
| Red Hills | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~83 km |
| Madhavaram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~90 km |
| Ambattur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~97 km |
| Avadi | ~₹971 | ~₹4,662 | ~₹47 | ~₹17,483 | ~₹500~89 km |
| Tiruvallur | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~67 km |
| Sriperumbudur | ~₹971 | ~₹4,662 | ~₹47 | ~₹17,483 | ~₹500~87 km |
| Tambaram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
See all 118 delivery areasDelivered price per ton, per unit, per cft and per load, by zone
North Chennai
| Delivery area | Delivered price / ton (incl. GST) | Delivered / unit (100 cft) | Delivered / cft | Delivered / 18 MT load | of which transport / ton |
|---|---|---|---|---|---|
| Red Hills | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~83 km |
| Madhavaram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~90 km |
| Manali | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~90 km |
| Mathur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~90 km |
| Puzhal | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~90 km |
| Ennore | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Ernavoor | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Kolathur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Perambur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Thiruvottiyur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Vyasarpadi | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Basin Bridge | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Kathivakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Korukkupet | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Royapuram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Tondiarpet | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Washermanpet | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
Central Chennai
| Delivery area | Delivered price / ton (incl. GST) | Delivered / unit (100 cft) | Delivered / cft | Delivered / 18 MT load | of which transport / ton |
|---|---|---|---|---|---|
| Chennai | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~90 km |
| Aminjikarai | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Ayanavaram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Choolai | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Choolaimedu | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Egmore | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| George Town | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Kilpauk | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Kodambakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Park Town | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Periamet | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Purasawalkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Shenoy Nagar | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Sowcarpet | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Vepery | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| West Mambalam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Alwarpet | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Chepauk | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Gopalapuram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Nandanam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Royapettah | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| T. Nagar | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Teynampet | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Thousand Lights | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Triplicane | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Mylapore | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Santhome | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
West Chennai
| Delivery area | Delivered price / ton (incl. GST) | Delivered / unit (100 cft) | Delivered / cft | Delivered / 18 MT load | of which transport / ton |
|---|---|---|---|---|---|
| Sriperumbudur | ~₹971 | ~₹4,662 | ~₹47 | ~₹17,483 | ~₹500~87 km |
| Avadi | ~₹971 | ~₹4,662 | ~₹47 | ~₹17,483 | ~₹500~89 km |
| Anna Nagar | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Korattur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Mogappair | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Padi | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Poonamallee | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Villivakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~95 km |
| Ambattur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~97 km |
| Arumbakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Koyambedu | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Maduravoyal | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Nerkundram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Nolambur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Porur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Saligramam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Vadapalani | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Valasaravakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Virugambakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~100 km |
| Ashok Nagar | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| K.K. Nagar | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Ramapuram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
South Chennai
| Delivery area | Delivered price / ton (incl. GST) | Delivered / unit (100 cft) | Delivered / cft | Delivered / 18 MT load | of which transport / ton |
|---|---|---|---|---|---|
| Kotturpuram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Manapakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Nandambakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Saidapet | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| St. Thomas Mount | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~105 km |
| Adyar | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Alandur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Besant Nagar | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Chromepet | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Guindy | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Meenambakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Pallavaram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Tambaram | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Taramani | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Velachery | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Madipakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~115 km |
| Pallikaranai | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~115 km |
OMR / ECR
| Delivery area | Delivered price / ton (incl. GST) | Delivered / unit (100 cft) | Delivered / cft | Delivered / 18 MT load | of which transport / ton |
|---|---|---|---|---|---|
| Thiruvanmiyur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~110 km |
| Neelangarai | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~115 km |
| Palavakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~115 km |
| Perungudi | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~115 km |
| Thoraipakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~115 km |
| Injambakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~120 km |
| Karapakkam | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~120 km |
| Sholinganallur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~120 km |
| Semmancheri | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~125 km |
| Kanathur | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~130 km |
| Siruseri | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~130 km |
| Uthandi | ~₹1,045 | ~₹5,015 | ~₹50 | ~₹18,806 | ~₹570~130 km |
Tiruvallur district
| Delivery area | Delivered price / ton (incl. GST) | Delivered / unit (100 cft) | Delivered / cft | Delivered / 18 MT load | of which transport / ton |
|---|---|---|---|---|---|
| Uthukottai | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~43 km |
| Manellore | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~55 km |
| Periyapalayam | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~64 km |
| Vengal | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~65 km |
| Tiruvallur | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~67 km |
| Kavaraipettai | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~80 km |
| Gummidipoondi | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~82 km |
| Ponneri | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~85 km |
| Pulicat | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~85 km |
| Puduvoyal | ~₹866 | ~₹4,158 | ~₹42 | ~₹15,593 | ~₹400~87 km |
| Thatchur | ~₹887 | ~₹4,259 | ~₹43 | ~₹15,971 | ~₹420~90 km |
| Athipattu | ~₹1,019 | ~₹4,889 | ~₹49 | ~₹18,333 | ~₹545~93 km |
| Minjur | ~₹887 | ~₹4,259 | ~₹43 | ~₹15,971 | ~₹420~93 km |
| Sholavaram | ~₹887 | ~₹4,259 | ~₹43 | ~₹15,971 | ~₹420~95 km |
| Kattupalli | ~₹1,019 | ~₹4,889 | ~₹49 | ~₹18,333 | ~₹545~108 km |
Andhra Pradesh
| Delivery area | Delivered price / ton (incl. GST) | Delivered / unit (100 cft) | Delivered / cft | Delivered / 18 MT load | of which transport / ton |
|---|---|---|---|---|---|
| Srikalahasti | ~₹625 | ~₹2,999 | ~₹30 | ~₹11,246 | ~₹170~40 km |
| Sathyavedu | ~₹646 | ~₹3,100 | ~₹31 | ~₹11,624 | ~₹190~45 km |
| Naidupeta | ~₹667 | ~₹3,200 | ~₹32 | ~₹12,002 | ~₹210~50 km |
| Renigunta | ~₹688 | ~₹3,301 | ~₹33 | ~₹12,380 | ~₹230~55 km |
| Tada | ~₹709 | ~₹3,402 | ~₹34 | ~₹12,758 | ~₹250~60 km |
| Sullurpeta | ~₹709 | ~₹3,402 | ~₹34 | ~₹12,758 | ~₹250~65 km |
| Tirupati | ~₹709 | ~₹3,402 | ~₹34 | ~₹12,758 | ~₹250~65 km |
| Sri City | ~₹746 | ~₹3,578 | ~₹36 | ~₹13,419 | ~₹285~75 km |
Indicative ₹ per MT per km slabs used only by the delivered-cost estimator. Actual transport is quoted per order (distance, diesel ~₹100/L, vehicle availability, unloading conditions).
Most requested in
GSB supplied for our approach road passed the density tests first time. Gradation was exactly as per our specification sheet. Their team even arranged night-time delivery for our traffic window.
Ordered GSB in bulk for a factory internal road. Material was tested by our consultant and cleared without rework. Coordination over WhatsApp was quick, and the final invoice matched the quotations exactly.
40mm ballast supplied for our foundation piling and PCC work. Stone is hard granite with very few flakes. Being close to their quarry at Perindesam, our transport cost also came down noticeably.
We publish reviews from buyers who have taken delivery, in their own words, after our sales desk has confirmed the order. If you have ordered from us, yours could be the first.
GSB (Granular Sub-Base) — questions buyers ask
What is the difference between GSB and WMM?
GSB is the lower sub-base layer (MoRTH 401), graded for bearing and drainage with up to 53–75 mm stone; WMM is the base course above it (MoRTH 406), 53 mm down, mixed with water in a pug mill and laid to tighter tolerances. Both are crusher-run blends; WMM must be non-plastic with LA abrasion ≤ 40%.
Which GSB grade should I order?
Follow the contract drawing. Grading II (53 mm down) is the usual choice for state roads, layouts and yards; Grading I (75 mm down) for heavier highway sub-base; Gradings III/IV where the layer is designed as a drainage course.
How many tonnes of GSB per kilometre of road?
For a 7 m carriageway at 200 mm compacted thickness: 7 × 0.2 × 1,000 = 1,400 m³ × 2.2 t/m³ ≈ 3,080 MT, about 150–160 ten-wheeler loads. At 150 mm it is roughly 2,300 MT.
Do you provide test certificates for GSB?
A gradation certificate is issued per lot; physical tests (CBR, LA abrasion, impact value, plasticity) are arranged through accredited third-party laboratories for contract supplies.
From our team
Notes, photos and examples added by the M&B Chetty team, with the author and the date.
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Need GSB (Granular Sub-Base) in bulk?
Tell us the quantity, grading and delivery area. Call-back within 15 minutes during desk hours for a delivered quote and a dispatch slot.