Jalli / Blue Metal Price in Chennai Today — 20mm, 40mm, 60mm Rates & Per-Unit Coverage 2026
Ramesh had done everything right — he had a BOQ, a contractor he trusted, and a construction schedule that was holding. Then, during the second slab pour at his 1,200 sqft home in Sholinganallur, his site supervisor called to say they were short on 20mm jalli. The next delivery was three days away.
Under pressure, the contractor substituted with 40mm aggregate from leftover stock on an adjacent site. The pour happened. The slab set. And two years later, during a home inspection, a structural engineer found inconsistent aggregate distribution causing localised zones of reduced compressive strength in that slab. The repair cost ₹1.1 lakhs. The root cause was a three-day procurement gap and a ₹4,500 aggregate decision made under pressure.
If you're planning aggregate procurement for your Chennai home and want to know exactly what 20mm, 40mm, and 60mm jalli should cost today — before a similar pressure situation forces a bad call — call Buildiyo at +91 93848 19295 or +91 93848 19297. This guide gives you every rate, every coverage figure, and every procurement insight you need.
What Is Jalli / Blue Metal?
'Jalli' is the Tamil word for crushed stone aggregate — the coarse component that makes up the backbone of concrete's compressive strength. In Chennai, the dominant aggregate type is crushed granite, sourced primarily from regional quarry zones. Its grey-blue colour when freshly crushed gives rise to the common name 'Blue Metal' used interchangeably with jalli across Chennai construction sites.
Aggregate is not a passive filler in concrete — it is an active structural component. The size, shape, gradation, surface texture, and cleanliness of your jalli directly determine four critical concrete properties:
Aggregate interlock mechanism. The 28-day MPa value of your concrete depends as much on aggregate quality as on cement grade.
Particle shape and gradation affect how the mix places, compacts, and finishes — critical for slab and column pour quality.
Coarser aggregate reduces drying shrinkage. Right size choice for the right pour prevents hairline-to-structural crack progression.
Aggregate quality affects resistance to chemical attack, abrasion, and weathering — the difference between 50-year and 30-year concrete.
Using the wrong jalli size for a structural application — or using aggregate that fails IS 383 gradation requirements — silently compromises every other quality decision you've made on that pour, including your cement brand and water-cement ratio.
20mm, 40mm and 60mm — Where Each Wins
Three primary aggregate sizes dominate Chennai construction. Each has one correct application and several wrong ones. The 20mm size is the hero of residential RCC; 40mm and 60mm serve narrower, specific purposes:
The Standard for All Residential RCC
The most widely used aggregate size in residential construction. IS 383 designates this as nominal maximum size aggregate (NMSA) of 20mm — 95% or more of particles pass a 25mm sieve. Best balance of workability, compaction ease, and structural performance.
- Gradation: IS 383 Coarse Aggregate Zone 20mm single-size or graded
- Mix grades: M20, M25, M30 — all standard residential
- Bulk density: 1,450–1,600 kg / cubic metre
- Best for: All structural RCC — columns, beams, slabs, footings, plinth beams, staircases
- Not for: Thin sections below 75mm depth — use 10mm aggregate
Mass Concrete and Foundation Work Only
40mm aggregate is used for large-volume pours where reduced cement content is acceptable and surface finish is secondary. In residential construction, primarily for foundations (particularly raft and large isolated footings), lean concrete (PCC layers), sub-base work, and rubble soling.
- Gradation: IS 383 Coarse Aggregate 40mm NMS
- Mix grades: M10 PCC, M15 lean concrete, large mass foundations
- Bulk density: 1,400–1,550 kg / cubic metre
- Best for: PCC lean concrete, raft foundations, sub-base, rubble soling
- Never for: Columns, beams, slabs, any reinforced section
Sub-Base and Drainage Layers Only
60mm aggregate is the coarsest standard construction size and the least used in residential projects. Applications limited to very large mass concrete pours (gravity dams, heavy retaining walls), sub-base road construction, drainage fill layers, and gabion work. In typical Chennai residential construction, 60mm appears primarily in foundation sub-base and perimeter drainage fills.
- Best for: Sub-base compaction, drainage layers, large retaining wall mass concrete
- Never for: Structural RCC of any kind in residential construction
20mm jalli is the correct specification — without exception
For all residential structural RCC work in Chennai, 20mm jalli is the correct specification. Using 40mm aggregate in columns, beams, or slabs compromises compaction quality around reinforcement bars, creates aggregate bridging voids, and reduces effective concrete cover — all structural defects that are invisible until they cause failure. Never allow 40mm aggregate to be used in any reinforced structural element.
Jalli / Blue Metal Price in Chennai — Complete Q2 2026 Rates
Prices below are indicative Q2 2026 market rates per cubic foot (cft) for granite aggregate in Chennai. Prices vary by quarry source zone, transport distance, and order volume. For today's live rate: today's sand & aggregates price page.
| Size | Grade / Type | Retail (Rs/cft) | Bulk 100+ cft | Bulk 500+ cft |
|---|---|---|---|---|
| 6mm chips | Fine aggregate / tile bedding | ₹38–48 | ₹34–44 | ₹30–40 |
| 10mm jalli | Nominal max 10mm · IS 383 | ₹42–52 | ₹38–48 | ₹34–44 |
| 20mm jalli★ HERO | Nominal max 20mm · IS 383 | ₹44–56 | ₹40–52 | ₹36–48 |
| 40mm jalli | Nominal max 40mm · IS 383 | ₹40–50 | ₹36–46 | ₹32–42 |
| 60mm jalli | Nominal max 60mm · IS 383 | ₹36–46 | ₹32–42 | ₹28–38 |
| Quarry dust | Stone dust · IS 383 fine agg | ₹22–32 | ₹18–28 | ₹15–24 |
| Mixed gravel | Ungraded mixed aggregate | ₹30–42 | ₹26–38 | ₹22–34 |
Blue Metal Price by Chennai Zone — 20mm Jalli (Rs/cft)
20mm jalli pricing varies significantly across Chennai zones due to transport distance from regional quarry routes and local construction demand:
| Zone | Key Areas | 20mm Retail | 20mm Bulk (500+) | Key Driver |
|---|---|---|---|---|
| South Chennai | Velachery, Adyar, Perungudi | ₹46–55 | ₹38–48 | High demand · moderate transport cost |
| South-East (OMR / ECR) | Sholinganallur, Perumbakkam, ECR | ₹44–54 | ₹36–46 | Most competitive · high construction volume |
| West Chennai | Porur, Poonamallee, Ambattur | ₹42–52 | ₹34–44 | Closer to regional quarry supply routes |
| Central Chennai | T.Nagar, Egmore, Nungambakkam | ₹48–58 | ₹40–50 | Highest transport & handling cost |
| North Chennai | Madhavaram, Tondiarpet, Redhills | ₹40–50 | ₹32–42 | Best rates · close to NH supply corridors |
| Outer Suburbs | Tambaram, Chrompet, outer zones | ₹38–48 | ₹30–40 | Lowest rates · shorter supply chain |
Need IS 383-verified jalli? 20mm, 40mm, 60mm — all sizes, all zones, same-day delivery.
How Much Jalli Do You Need Per Stage?
This is the section most homeowners never get from their contractor — a transparent, per-stage aggregate quantity breakdown. Use these figures to cross-check your contractor's procurement requests before approving any order.
Coverage for M20 Concrete (1:1.5:3 Nominal Mix · 20mm Jalli)
A 1:1.5:3 nominal mix for M20 grade concrete (1 part cement : 1.5 parts M Sand : 3 parts 20mm jalli) uses approximately 0.84 cft of 20mm jalli per bag of cement. In volume terms, 1 cubic metre of M20 concrete requires approximately 0.91 m³ (or 32 cft) of 20mm jalli.
| Construction Stage | Concrete Grade | Jalli Size | Per 1500 sqft G+1 |
|---|---|---|---|
| PCC Lean Concrete | M10 | 40mm | 100–140 cft |
| RCC Isolated Footings | M20 | 20mm | 160–200 cft |
| Plinth Beams | M20 | 20mm | 80–110 cft |
| Columns (Ground + First) | M25 | 20mm | 180–240 cft |
| Beams (Ground + First) | M25 | 20mm | 160–200 cft |
| Ground Floor Slab (125mm) | M20 | 20mm | 260–310 cft |
| First Floor Slab (125mm) | M20 | 20mm | 260–310 cft |
| Staircase & Misc. RCC | M20 | 20mm | 40–70 cft |
| Sub-base / Rubble Soling | Sub-base | 60mm | 80–120 cft |
| TOTAL · All Stages | Mixed | Mixed | 1,320–1,700 cft |
Plan for 1,400 to 1,750 cft Total Aggregate · 10% Buffer Always
For a standard 1,500 sqft G+1 RCC house in Chennai, the right size-split looks like this:
Always maintain a 10% procurement buffer — running short mid-pour is far more expensive than having a modest surplus. This is exactly the gap that caused Ramesh's ₹1.1 lakh repair.
Jalli Budget for Your Chennai Home
Total aggregate budget scaling by home size at Q2 2026 average rates. Use these figures to cross-check the aggregate line in your construction BOQ:
| Home Size | Total Jalli (cft) | 20mm Cost | 40+60mm Cost | Total Aggregate Budget |
|---|---|---|---|---|
| 800 sqft · G only | 700–900 | ₹25,920–34,560 | ₹4,800–7,200 | ₹30,720–41,760 |
| 1,000 sqft · G+1 | 1,050–1,350 | ₹38,880–50,400 | ₹7,200–10,800 | ₹46,080–61,200 |
| 1,500 sqft · G+1 | 1,320–1,700 | ₹48,960–64,800 | ₹9,600–14,400 | ₹58,560–79,200 |
| 2,000 sqft · G+1 | 1,700–2,200 | ₹63,360–84,480 | ₹12,000–18,000 | ₹75,360–1,02,480 |
Compare to current live pricing before procurement: today's sand & aggregates price page.
Get a stage-by-stage aggregate plan
before the first lorry arrives at your site
Send us your floor plan and BOQ. Our materials desk will return a stage-by-stage 20mm / 40mm / 60mm quantity plan with cost estimates and delivery scheduling in 24 hours. Free of charge. Prevents the ₹1.1 lakh repair that Ramesh paid for a three-day procurement gap.
How to Verify the Quality of Jalli Delivered to Your Site
Aggregate quality problems in Chennai are more common than most homeowners realise — and more difficult to detect visually than cement or steel issues. Five on-site checks every site supervisor should run before signing for any aggregate delivery:
Sieve / Gradation Check
IS 383-compliant 20mm jalli should have 95%+ material passing a 25mm sieve and less than 10% passing a 4.75mm sieve. A simple on-site graded sieve check reveals non-compliance immediately.
Flakiness & Elongation
Flaky or elongated particles (thin plate-like or needle-like shapes) reduce concrete strength by creating weak planes. Pick up a handful — if more than 30–40% of pieces appear flat or needle-shaped, the source is suspect.
Silt & Dust Content
Wash a sample under clean water. Milky or dark runoff indicates excessive fines coating the aggregate surface — this breaks the cement-aggregate bond and reduces compressive strength.
Crushing Value
Tap a piece with a hammer. Genuine granitic blue metal should not shatter or show layered splitting. Soft or laminated stone (limestone, shale substitutes) produces markedly lower concrete strength.
Source Verification
Ask for the quarry source on the delivery challan. Verified regional quarry granite is the Chennai market standard. Unknown or unstated sources warrant extra scrutiny — refuse without documentation.
15–35% Below Design Strength · Visually Indistinguishable
A significant portion of aggregate sold through informal lorry-based suppliers in Chennai's suburban zones is not crushed granite — it is softer limestone, shale-contaminated stone, or mixed quarry waste. These materials visually resemble genuine blue metal but produce concrete compressive strength 15–35% below design values. Buy only from verified, documented sources. An IS 383 compliance certificate for each batch should be standard, not exceptional.
We rejected two lorry loads of 20mm jalli at a Sholinganallur site last year — they looked fine on the truck but failed the flakiness test badly. The contractor was furious. Six months later, when I showed him the core test results from a nearby site that had accepted similar material, he understood why we were right.
Skip the Procurement Headache for Slabs — Consider RMC
Factory-Batched M20 / M25 / M30 — Pre-Mixed, Delivered Direct
If managing separate procurement of 20mm jalli, M Sand, cement, and water-cement ratio for your slab pours feels like too many variables — it is. Ready Mix Concrete (RMC) from a certified plant removes all of these variables simultaneously.
- Aggregate gradation uncertainty: eliminated — plant uses calibrated graded aggregate
- Water-cement ratio errors: eliminated — plant pre-batches the exact mix to IS 456 spec
- Compaction quality from site-mixed batches: eliminated — concrete arrives at confirmed slump
- Procurement gap risk: eliminated — the exact issue that caused Ramesh's ₹1.1 lakh repair
Check today's RMC price in Chennai — M20, M25, M30 grades. RMC is now competitively priced for slabs of 500 sqft and above. Order Ready Mix Concrete at Buildiyo Store — scheduled delivery, consistent quality, zero procurement stress.
Complete Your Structural Budget
Aggregate is one of four materials in every concrete pour. The other three need synchronised procurement and quality verification to deliver design-grade structural performance:
M Sand (Concrete Grade)
Your 20mm jalli and concrete M Sand are always procured together in a fixed ratio. Synchronise both procurements at the same depot for batch-matched quality.
Cement (OPC 53 & PPC)
ISI-marked cement for all structural pours. OPC 53 for high-strength structural, PPC for slabs and plaster. Pair the cement grade to the concrete grade.
TMT Steel Bars · Fe500D
The structural partner to every concrete pour. Fe500D grade is the residential standard — earthquake-resistant ductility class for slabs, beams, columns.
Builder running multiple sites? Bulk-tier pricing · IS 383 batch certificates · 30-day credit.
The 20mm Rule, the Right Coverage, the Verified Source
Ramesh from Sholinganallur paid ₹1.1 lakh in slab repair because a three-day procurement gap forced a 40mm-for-20mm substitution that should never have happened. The story had to happen — there was no plan in place to prevent it. This guide gives you the plan: 20mm jalli for all residential RCC, 40mm for PCC and sub-base, 60mm for drainage. Verified IS 383 sources. Same-day Chennai delivery. The procurement gap doesn't have to be your problem.
Frequently Asked Questions
Direct answers on jalli pricing, the 20mm rule, lorry-load coverage, and quarry dust versus jalli for Chennai April 2026.
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