IS Code Library — Indian Standards Plain English

IS 456:2000 BIS Verified

Plain & Reinforced Concrete — Code of Practice

Covers design and construction of plain and reinforced concrete structures. The primary structural design code for all RCC construction in India.

Clause 26.4 — Nominal cover to reinforcement (moderate exposure: 30mm for columns/beams)

Clause 26.1 — Development length: Ld = φ·σs / (4·τbd)

Table 5 — Maximum water-cement ratio by exposure condition

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IS 2502:2014 BIS Verified

Bar Bending Schedule — Code of Practice

Specifies methods for preparing bar bending schedules and shape codes for reinforcement bars used in RCC construction.

18 standard shape codes — from shape 01 (straight) to shape 99 (custom)

Hook allowances: 9d for standard hooks; 4d for 90° bend; 2d for 45° bend

Wastage factor: 3–5% for cutting and lapping losses

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IS 1786:2008 BIS Verified

High Strength Deformed Bars & Wires for Concrete Reinforcement

Specifies requirements for cold-twisted deformed bars (CTD) and thermo-mechanically treated (TMT) bars used as reinforcement in RCC structures.

Grades: Fe415, Fe415D, Fe500, Fe500D, Fe550, Fe550D, Fe600

D suffix (ductile): minimum elongation 18% vs 14.5% for standard grade

Unit weight formula: W = d² ÷ 162.28 (kg/m for diameter d in mm)

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IS 383:2016 BIS Verified

Coarse & Fine Aggregate — Specification

Specifies requirements for coarse and fine aggregate for use in concrete. Includes grading, deleterious matter limits, and physical/mechanical properties.

Fine aggregate zones: Zone I (coarser) to Zone IV (finer) — Zone II most preferred

Silt content limit: 8% for crushed sand, 3% for natural sand (by mass)

Nominal size of coarse aggregate: 40mm, 20mm, 16mm, 12.5mm, 10mm

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IS 516:1959 BIS Verified

Methods of Tests for Strength of Concrete

Specifies methods for testing fresh and hardened concrete — slump, compaction factor, compressive strength, tensile strength, flexural strength.

Slump test: measured to nearest 5mm; target 25–100mm for RCC

Cube moulds: 150mm × 150mm × 150mm; test at 7 and 28 days

Compressive strength acceptance: mean strength ≥ fck + 3 N/mm² (IS 456 Cl. 16)

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Last reviewed: 2024-11

IS 875:1987 (Parts 1–5) BIS Verified

Code of Practice for Design Loads (Other than Earthquake)

Specifies design loads for buildings: dead loads (Part 1), imposed loads (Part 2), wind loads (Part 3), snow loads (Part 4), special loads (Part 5).

Dead load — Unit weights: RCC 25 kN/m³; brick masonry 20 kN/m³; plain concrete 24 kN/m³

Imposed floor load — Residential: 2.0 kN/m²; Office: 3.0 kN/m²; Storage: 7.5 kN/m²

Wind pressure: Pd = 0.6 × Vz² (N/m²) where Vz = design wind speed at height z

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IS 800:2007 BIS Verified

General Construction in Steel — Code of Practice

Covers design, fabrication, and erection of steel structures using the Limit State Design approach. Supersedes the Working Stress Method edition.

Design philosophy: Limit State Method (LSM) — factored loads, characteristic strengths

Partial safety factors: γf0 = 1.5 for DL+LL; γm0 = 1.10 for yield; γm1 = 1.25 for ultimate

Tension member: Tdg = Ag·fy / γm0; Tdn = 0.9·Anet·fu / γm1

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IS 4326:2013 BIS Verified

Earthquake Resistant Design & Construction of Buildings

Provides guidelines for earthquake-resistant design and construction of buildings in India, categorised by seismic zones II through V.

Seismic zones: II (low), III (moderate), IV (severe), V (very severe)

Zone factor Z: 0.10, 0.16, 0.24, 0.36 for Zones II, III, IV, V respectively

Soft storey: storey stiffness < 70% of storey above — must be avoided

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