Jelly/Aggregate Sizes Explained: 6mm vs 12mm vs 20mm vs 40mm
Ordering the wrong aggregate size is a common, costly mistake — 40mm jelly in a plastering mix won't work, and 6mm in a foundation pour wastes money on a finer, pricier material than the job needs. Here's which size to order for what.
| Size | Best for | Price/ton |
|---|---|---|
| 6mm (grit) | Plastering mixes, tile fixing | ₹480-500 |
| 12mm | Thin concrete toppings, screeds | ₹480-500 |
| 20mm | RCC slabs, columns, beams | ₹700-1,050 |
| 40mm | Mass concrete, foundations, road base | ₹600-1,100 |
If you're not sure which size your contractor's design calls for, check the structural drawing or ask your mason — the wrong size can affect concrete strength and finish, not just cost.
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Frequently Asked Questions
Which jelly size is used for RCC slab work?
20mm aggregate is the standard choice for RCC slabs, columns and beams in residential construction. It balances strength with workability in the concrete mix.
What is 40mm jelly used for?
40mm aggregate is used for mass concrete, road base and foundation work where very fine finish isn't needed — it's cheaper per ton and suits large-volume pours.
What are 6mm and 12mm jelly used for?
6mm and 12mm (also called grit or chips) are used for plastering mixes, tile fixing, and thin concrete toppings where a fine aggregate is needed.
What does jelly/aggregate cost in Bangalore?
6mm and 12mm run roughly ₹480-500/ton, 20mm roughly ₹700-1,050/ton, and 40mm roughly ₹600-1,100/ton, depending on grade and quantity ordered.