Method of measurement of building and civil engineering works, Part 2: concrete works

IS 1200 Part 2 - Scope & Measurement Key Points

Scope:

• Covers method of measurement for building and civil engineering works.
• All measurements are net, decimal system, based on fixed dimensions (Clause 2.4).
• Extra work beyond specified dimensions is ignored.

Key Measurement Specifications (Clause 4.3 & Table 1):

Important Notes:

• Precast concrete includes mould use, finishing, reinforcement supply.
• Hoisting and setting in position are included unless otherwise stated.
• Reinforcement may be measured separately if specified.

flowchart TD
    A[Start: Work to be measured] --> B{Type of work}
    B -->|Wall panels, slabs| C[Measure in m²]
    B -->|Beams, columns, trusses| D[Measure in running m or numbers]
    B -->|Blockwork| E[Measure in m³ or m²]
   

IS 1200 Part 2: General Rules for Measurement of Concrete Works

Key Specifications & Formulas

• Scope (Clause 1.1):
  Covers measurement methods for concrete works in building and civil engineering (excludes roads, piling, wells, tunneling covered in other parts).

• General Rule (Clause 2.3):
  Each item includes conveyance, delivery, handling, unloading, storing, fabrication, lowering, hoisting, finishing, setting, fitting, fixing, cutting, waste disposal, etc.

• Precast Concrete Works (Clause 4.3):

  • Includes use of molds, finishing faces, reinforcement supply.
  • Mix, mortar, inserts, hoisting included unless stated otherwise.
  • Measurement classified as per Table 1 below.

Table 1: Measurement Units for Precast Concrete Components

Summary Diagram

flowchart TD
    A[Concrete Works Measurement] --> B[Precast Concrete]
    B --> C[Wall panels, slabs (m²)]
    B --> D[Beams, columns (m or Nos.)]
    B --> E[Channels, purlins (m

IS 1200 Part 2: Units of Measurement Summary

• General Rule (Clause 2.4):
  All dimensions are measured net in the decimal system as fixed in place. Extra work beyond specified dimensions is ignored.

• Dimension Precision (Clause 2.4.1):

  • Lengths and widths: measured to nearest 0.01 m
  • Thickness of slabs: measured to nearest 0.005 m

• Concrete Work Measurement (Clause 4.1.2):

  • Measured in cubic metres (m³) unless otherwise stated.

Key Points:

Measurement Method Flow:

flowchart TD
    A[Start Measurement] --> B{Type of Work?}
    B -->|Concrete| C[Measure volume in m³]
    B -->|Other| D[Measure dimensions in m with precision]
    D --> E{Is slab thickness?}
    E -->|Yes| F[Measure thickness to 0.005 m]
    E -->|No| G[Measure to 0.01 m]
    C & F & G --> H[Record net dimensions only]
    H --> I[Ignore extra over specified dimensions]
    I --> J[End]

This ensures standardized, precise measurement for all structural elements per IS 1200 Part 2.

IS 1200 Part 2: Classification & Measurement of Concrete Works

1. Classification of Cast In Situ Concrete (Clause 4.2.1)

Concrete works are classified by structural element types, e.g.:

• Foundations, footings, bases
• Walls (any thickness, including pilasters, buttresses)
• Slabs (supported on beams/walls/columns, balconies, canopies)
• Lintels, shelves, beams
• Columns, piers, posts
• Staircases (excluding landings)
• Balustrades, railings
• Domes, vaults, shell roofs, arches
• Chimneys, shafts
• Retaining walls, ballast walls
• Kerbs, steps, copings, cornices, louvers

Note: Projections are included in main items.

2. Measurement of Precast Concrete (Clause 4.3, Table 1)

3. General Rules (Clause 4.1.1)

• Separate measurement for plain, reinforced, prestressed concrete.
• Separate measurement for cast in situ and precast concrete.
• Concrete works are grouped by structure type: buildings, dams, tunnels, marine works, special structures, etc.

Summary Diagram: Classification Flow

graph TD

IS 1200 Part 2: Measurement of Plain and Reinforced Concrete

Key Specifications (Clause 4.3 & Table 1)

Notes:

• Precast concrete includes mould use, finishing faces, reinforcement supply, inserts fixing, hoisting, and setting unless stated otherwise.
• Reinforcement may be measured separately if specified.
• Each item must be fully described in measurement.

Practical Tip:

• Always state thickness for partitions and openings.
• Use running metres for linear elements and square/cubic metres for planar/volumetric elements.

flowchart TD
    A[Concrete Element] -->|Wall Panel| B[Measure in m²]
    A -->|Beam/Column| C[Measure in m or Nos.]
    A -->|Blockwork| D[Measure in m³ or m²]
    A -->|Partitions| E[Measure in m² + Thickness]
    A -->|Frames| F[Measure in m + Size]

This concise framework ensures accurate and standardized measurement for billing and execution per IS 1200 Part 2.

IS 1200 Part 2: Measurement of Concrete in Structural Elements

Key Specifications & Measurement Units (Clause 4.3, Table 1)

General Rules

• Measurement includes mould use, finishing faces, reinforcement supply (may be measured separately).
• Hoisting and setting included unless otherwise stated.
• Concrete volume is generally calculated as length × breadth × thickness for solid elements.

Formula for Volume of Concrete:

[ V = L \times B \times D ]

Where:

• (V) = Volume (m³)
• (L) = Length (m)
• (B) = Breadth (m)
• (D) = Depth/Thickness (m)

flowchart TD
    A[Concrete Structural Element] --> B{Type}
    B -->|Wall Panel, Slab| C[Measure in m²]
    B -->|Beam, Column, Truss| D[Measure in Running Metres or Numbers]
    B -->|Blockwork| E[Measure in m

IS 1200 Part 2: Measurement of Precast Concrete Components

Key Specifications & Measurement Units (Clause 4.3, Table 1)

Important Notes (Clause 4.3 & 4.5.2)

• Precast concrete works include mould use, finishing faces, reinforcement supply, fixing inserts, and finishing.
• Hoisting, transportation, assembly, and setting in position are included unless otherwise stated.
• Precast units must be enumerated with number, size, length, fixing, and bedding method.
• Prestressing classification (Clause 4.5.2):

a) Pre-tensioned in mould  
b) Post-tensioned on ground after casting  
c) Cast in section, assembled and post-tensioned before erection  
d) Post-tensioned after hoisting but self-supporting  
e) Cast in sections, assembled in situ, post-tensioned after erection  
f) Post-tensioned after hoisting requiring support until tensioning

Summary Diagram of Measurement Units

flowchart TD
   

Measurement of Prestressed Concrete Cast In Situ (IS 1200 Part 2 - 1974)

Key Points from Clause 4.4:

• Prestressed concrete cast in situ must be fully described in the work specification.
• Measurement should include all components, materials, and processes involved.

Measurement Specifications:

• Unlike precast units (Clause 4.5), cast in situ prestressed concrete is measured by actual dimensions of the structural element.
• Typically measured in:
  • Cubic metres (m³) for volume of concrete placed.
  • Square metres (m²) for surface areas if applicable (e.g., slabs, walls).
• Reinforcement and prestressing cables are usually measured separately.

Related Measurement Methods (from Table 1 for concrete elements):

Additional Notes:

• Prestressing tendons/cables are measured by length (running metres).
• All processes like casting, curing, and finishing should be included in the description.
• For prestressed cast in situ, details of prestressing method (pre/post-tensioning) should be specified.

Summary Table for Prestressed Concrete Cast In Situ

flowchart TD
    A[Prestressed Concrete Cast In Situ] --> B[Concrete Volume (m³)]
    A --> C[Surface Area (m²) for slabs/walls]
    A --> D[Prestressing Tendons Length (m)]
    A --> E[Reinforcement measured separately]
    A --> F[Full description of work: casting, curing

IS 1200 Part 2 (1974) — Measurement & Fixing of Precast Concrete Units

Key Specifications & Measurement Methods (Clause 4.3 & Table 1)

Fixing & Enumeration (Clause 4.5.2)

• Precast units must be enumerated with number, size, length, fixing method, and bedding.
• Hoisting, transportation, assembly, and setting included unless specified.
• Classification by prestressing method:
  • a) Pre-tensioned in mould
  • b) Post-tensioned on ground
  • c) Cast in sections, assembled & post-tensioned before erection
  • d) Post-tensioned after hoisting (self-supporting)
  • e) Cast in sections, assembled in situ, post-tensioned after erection
  • f) Post-tensioned after hoisting (requires support)

Additional Notes

• Finishing work on precast components is measured separately in m² (Clause 4.3.2).
• Reinforcement may be measured separately or included.
• Hoisting and setting included in the item unless otherwise stated.

IS 1200 Part 2: Special Measurement Considerations

1. Cutting in Concrete (Clause 4.6.8 & 4.6.9)

• Grooves, chases: Measured in running metres × girth.
• Holes, mortices, openings: Measured per cm depth, classified by area:
  • Up to 250 cm²
  • 250 cm² to 0.1 m²
• Toothing and bonding: Measured in square metres (labour + material).

2. Toothing and Bonding (Clause 4.6.9)

• Labour and material for cutting, toothing, bonding new concrete walls to existing walls measured in m².

3. Forming Cavities (Clause 4.2.4.1)

• Measured in m².
• Description must state:
  • Width of cavity
  • Material, size, shape of ties
  • Number of ties per m²

4. Precast Concrete Measurement (Clause 4.3, Table 1)

5. Grout Holes & Waterproofing

• Not explicitly detailed in IS 1200 Part 2, but generally:
  • Grout holes measured by number and diameter.
  • Waterproofing measured as area covered (m²).

Summary Table for Cutting Measurement

IS 1200 Part 2: Description & Documentation of Items

Key Points from Clauses:

• Clause 2.3 (Description of Items):
  Each item description includes conveyance, delivery, handling, unloading, storing, fabrication, hoisting, finishing, setting, fitting, fixing, cutting, waste disposal, and labour unless stated otherwise.

• Clause 2.2 (Bill of Quantities):
  Items must fully describe materials and workmanship to represent the work executed.

• Clause 4.3 & Table 1 (Measurement of Precast Concrete Items):

Summary:

• Item descriptions must be comprehensive, covering all stages from delivery to fixing.
• Units of measurement depend on the item type (area, length, volume, or count).
• Reinforcement may be measured separately or included as described.

flowchart TD
    A[Item

IS 1200 Part 2 (1974) — Deductions and Additions in Measurement

Key Points on Deductions (Clause 4.1.8):

No deductions shall be made for:

• Ends of dissimilar materials (beams, posts, rafters, etc.) up to 500 cm² cross-section.
• Openings up to 0.1 m² (or as specified).
• Volume occupied by reinforcement.
• Volume of pipes, conduits, sheathing, etc., each not exceeding 100 cm² cross-sectional area.
• Small voids not exceeding 40 cm² cross-section (see Fig. 1).
• Moulds, drip moulding, chamfers, splays, rounded or coved angles, beds, grooves, rebates up to 10 cm width or 15 cm girth.
• Stops, mitres, returns, rounded ends, junctions, dishings related to linear or superstructures.

Note: Thickness of lintels or sills included in opening height; no extra labor measured for forming openings.

Measurement Specifications (Clause 2.4):

• All dimensions are measured net (actual fixed size) in decimal system.
• Any excess beyond specified dimensions is ignored.

Example Table Extract (Members Measurement):

Summary:

• No deduction for small openings, reinforcement, or minor voids within specified limits.
• Measurements are net and decimal.
• Special elements like folded slabs measured in cubic metres.

flowchart TD
    A[Concrete Volume] --> B{Check for deductions}
    B -->|Opening ≤ 0.1 m²| C[No Deduction]
    B -->|Reinforcement volume| C
    B -->|Small voids ≤ 40 cm²| C
    B -->|Moulds ≤ 10 cm width| C
    B -->|Others exceeding limits| D[Deduct volume]

This ensures consistent and fair measurement per IS 1200 Part 2.

Measurement of Concrete Fencing Posts as per IS 1200 Part 2

Classification (Clause 4.3.3.1)

Concrete fencing posts are classified by their average sectional area:

Method of Measurement (Clause 4.3 & Table 1)

• Fencing posts are measured in numbers or cubic metres.
• Measurement includes:
  • Use of moulds, finishing faces
  • Supply and fixing of reinforcement (may be measured separately)
  • Hoisting and setting in position (included unless stated otherwise)

Summary Table for Precast Concrete Components Measurement

Practical Notes:

• Calculate volume for posts when measured in cubic metres:

[ \text{Volume} = \text{Cross-sectional area} \times \text{Length} ]

• Cross-sectional area must be averaged over length.
• Ensure classification matches sectional area for correct measurement method.

flowchart TD
    A[Fencing Posts] --> B{Average Sectional Area}
    B -->|≤ 100 cm²| C[Class a]
    B -->|100-250 cm²| D[Class b]
    B -->|> 250 cm²| E[Class c]
    C & D & E --> F[Measure in Numbers or Cubic Metres]

This concise framework ensures correct classification and measurement of concrete fencing posts per IS 1200 Part 2.

IS 1200 Part 2: Rounding Off and Final Measurement Values

• Measurement Units: All dimensions are measured in the decimal system (meters).

• Rounding Rules (Clause 2.4 & 2.4.1):

  • Length, width, height: Rounded to the nearest 0.01 m.
  • Thickness of slabs: Rounded to the nearest 0.005 m.
  • Measurements are taken net (actual size fixed in position).
  • Any excess beyond specified dimensions is ignored (no extra measurement).

• Description of Items (Clause 2.3): The item description includes all related activities like conveyance, handling, fabrication, fixing, wastage, and disposal.

Summary Table for Rounding Off

Notes:

• Always measure to the nearest specified precision before final calculations.
• Use decimal system consistently for all measurements.
• Ignore any work done beyond specified dimensions (no extra payment).

flowchart TD
    A[Measurement] --> B{Dimension Type}
    B -->|Slab Thickness| C[Round to 0.005 m]
    B -->|Other Dimensions| D[Round to 0.01 m]
    C --> E[Record Net Measurement]
    D --> E
    E --> F[Ignore Extra Beyond Specified Size]

This ensures uniformity and accuracy in final billing and documentation.