Guides
Which sariya goes where in a house frame
IS 456 fixes no bar diameter for a footing, a column, a beam or a slab. What it fixes is the cover around whatever bar the design puts there, 50 mm at the footing and 40 mm on a column bar, and the diameter itself is written against each member on your own structural drawing. Nobody at this counter puts a size or a count against your building in place of that drawing.
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Jay Shree Infra keeps sariya in ten diameters at the Saharsa godown, 5.5 mm through 32 mm, and sends it out across Saharsa, Supaul and Madhepura. The question that reaches the phone before any size does is which one goes down in the footing, which one stands up in the column, and which one lies flat in the chhat. The answer is the same every morning: the structural drawing names it member by member, and IS 456 sets the cover that has to sit around whatever it names. What each diameter weighs is already on the sariya weight chart.
IS 456:2000 carries six amendments on BIS's own record, the last of them in 2024, and the cover figures below are the ones the unamended 2000 text prints. A drawing or a tender naming a different figure governs your job. How much steel a whole floor takes is a separate question and it sits on the 1000 sq ft page.
Member by member
What the code fixes, and what the drawing does
Six members of a house frame, the IS 456 minimum binding each one, what the structural drawing settles instead, and what stands on this rack against it.
Scroll the table sideways to see every column
| Member | What IS 456 fixes | What your drawing decides | Kept on this rackmm |
|---|---|---|---|
| Footing (niv) | At least 50 mm cover on the steel, clause 26.4.2.2, and no exposure class brings it down. | The mat diameter and the spacing between bars are named footing by footing. | sizes on the call |
| Column (khamba) | At least 40 mm cover on a longitudinal bar, clause 26.4.2.1, dropping to 25 mm only where the column is 200 mm or under on its smaller side and its bars are no thicker than 12 mm. | Which diameter stands upright in the column, and how many, is written against that column. | sizes on the call |
| Beam | Cover is measured to every bar including the links, clause 26.4.1, so the ring sits outermost and sets the figure. | Top steel, bottom steel and where the ring spacing tightens are named span by span. | sizes on the call |
| Slab (chhat) | the drawing decides | The main bar, the distribution bar and the spacing between them come off the slab layout. | sizes on the call |
| Lintel (lenter) | the drawing decides | Whatever steel goes over an opening is named on the drawing for that opening. | sizes on the call |
| Stirrups and ties (ring) | the drawing decides | The ring diameter, its spacing and where that spacing closes up are all drawn. | 5.5, 6 and 8, the small end of this rack |
The clause figures in the second column are cover, measured to all the steel including the links, and one further line of clause 26.4.1 sits over every row: cover is never less than the diameter of the bar it is holding, so a thick bar lifts its own floor before an exposure table is opened. Where a cell says the drawing decides, IS 456 fixes no diameter for that member and nobody at this counter will guess one. Ten diameters stand on this rack, 5.5, 6, 8, 10, 12, 16, 20, 25, 28 and 32 mm, and not every size is in every brand on a given day; call and we confirm what is standing.
Three rows carry a clause and three do not, and the split is worth reading twice. IS 456 is a code for the concrete and for how deep the steel sits inside it. How thick that steel is comes out of the structural design, which is a calculation on a load and a span, and the person who ran that calculation wrote the answer on your drawing.
The block height and the bar size meet in the diameter line of clause 26.4.1, which is why a cover order and a steel order are read off the same sheet of paper. The cover figure against each exposure class, and the block heights cast against them, are on the cover block guide.
IS 1786
Sizes a mill actually rolls, and the ten kept here
Whatever the drawing names has to be a size somebody rolls. BIS's product manual for IS 1786 lists the nominal sizes a licence covers: 4, 5, 6, 8, 10, 12, 16, 20, 25, 28, 32, 36, 40, 45 and 50 mm, with other sizes permitted by mutual agreement between the maker and the buyer. A house frame lives in the middle of that list, and the two ends of it belong to work bigger than a house.
Ten of those sizes stand on this rack. 5.5 mm is the one the standard has never listed, a trade size rolled to the bazaar's own habit, and 6 mm is on the standard's list but below the 8 mm line where the Standard Mark becomes compulsory. From 8 mm up the mark is on the bundle and a test certificate carrying the same mark travels with the consignment.
Grade is the other half of a sariya line on a drawing, and it moves on its own. Fe 500 against Fe 550D against Fe 600 is set out on the grades guide, and a drawing that names a grade names it beside the diameter rather than in place of it.
At this counter
A frame comes in loads, weeks apart
A frame order rarely arrives whole. The niv and column steel is the first load, because the trench and the starter bars are what the site is working on. The beam and slab steel follows weeks later, when the shuttering is up and the same drawing has been read further along. Two calls, one drawing, and the second call is the one people expect to be a repeat of the first.
It usually is not, and there is nothing wrong in that. A drawing names a different bar against a beam than against a footing mat, so the second load is read off those lines and not off the tag on the first. What a lenter day actually needs on site, in the order it needs it, is its own page.
Two things ride with every load. Ring steel for the stirrups and ties, cut from the small end of the rack, and the binding tar that holds the cage in shape until the concrete is around it. Neither is worth a trip of its own, and both are easy to leave off a call that is thinking about the main bars.
One thing is settled before any figure is written down: whether the order runs on kilos or on pieces. The bill reads differently against each, and the tag that goes on the bundle follows whichever was said, so it is fixed on the call rather than at the gate.
Sources
The concrete code, the bar standard, the marking order
Three primary records: the Bureau's own entry for the concrete code, its product manual for the bar standard, and the order that sets where compulsory marking starts.
- BIS's catalogue entry for IS 456:2000, the concrete code these cover clauses come fromBureau of Indian Standards
- The BIS product manual for IS 1786, which prints every nominal bar size a licence coversBureau of Indian Standards
- S.O. 3716(E) of 29 August 2024, the order leaving bars under 8 mm outside compulsory markingMinistry of Steel
Questions
Kaun sa sariya kahan lagta hai
Column me kaun sa sariya lagta hai?
Whichever diameter the structural drawing writes against that column. IS 456 fixes no bar size for a column; what it fixes is 40 mm of cover on the longitudinal bar under clause 26.4.2.1, dropping to 25 mm only where the column is 200 mm or under on its smaller side and carries bars no thicker than 12 mm. Ten diameters stand on this rack, 5.5 mm to 32 mm, so read the drawing's figure out on the call and we say what is standing against it.
Chhat ki dhalai me kaun se size ka sariya padta hai?
The slab layout names it, usually as a main bar and a distribution bar with a spacing written against each. No figure for your own chhat comes off a rule of thumb, because the span and the load it was calculated for are yours alone. Say the sizes and the spacing on the call and we read out what is on the floor against them.
Ring ya stirrup ke liye kitne mm ka sariya chahiye?
The drawing names the ring diameter and its spacing the same way it names the main bars. The small end of this rack is 5.5, 6 and 8 mm. Below 8 mm the Quality Control Order does not ask for the Standard Mark, so a bare bundle at 5.5 or 6 mm is not a fault; from 8 mm up the mark is on the bundle and the certificate comes with it.
Sariya ka size aur ginti aap bata denge kya?
Both come off the structural drawing or the bar bending schedule, and that is the only place either can honestly come from. What we settle on the phone is which of the ten diameters is standing that morning, in which brand, and what the bundle is carrying. Bring the schedule to the call and the order is written straight off its lines.
Footing ka sariya pehle aur beam ka baad me mangwa sakte hain?
Yes, and a frame usually moves that way. The footing and column steel goes out first, the beam and slab steel weeks later off the same drawing read further along. Say which member each load is for, because the diameters on the second load are often not the ones on the first.
Before you order
Four lines off the sheet in front of you
Which member is this load for?
Footing, column, beam, slab or lintel. The steel is named against each of them separately and two members rarely land on the same figure.
Which size is written against that member?
Read it off the bar bending schedule where one exists, line by line, rather than off the member beside it.
What ring diameter and spacing are drawn?
Stirrups and ties sit on their own lines and they travel with whichever load is going out, so say them on the same call.
Should the bill read in kilos or in pieces?
Settled before the bundle is tied, because the tag and the bill both follow whichever basis was named.
Contact
One drawing, two loads, one rack
A frame leaves this counter in more than one load, and each load is read off a different part of the same sheet. Say which member the steel is for, the size written against it, the ring diameter and spacing beside it, and whether the bill runs in kilos or in pieces. Ring +91 6202 967 218 and we read back what is standing in that size, in which brand, before anything is cut or tied.
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