Method of measurement of building and civil engineering works, Part 10: ceiling and linings

IS 1200 Part 10: Scope Summary

• Scope: Covers the method of measurement for ceilings and linings in buildings and civil engineering works (Clause 1.1, 5.1).
• Materials Description: Bills of Quantities must fully describe materials, thickness, workmanship, and fixing methods (Clause 2.5, 3.1).
• Supporting Members: Measured separately under relevant parts unless specified otherwise (Clause 3.1).
• Rounding Off: Final values must be rounded as per IS 2-1960, maintaining the same significant figures as specified (Clause 0.6).

Key Specifications

Rounding Off (IS 2-1960)

• Round to same decimal places/significant figures as the standard value.
• Use conventional rounding rules (e.g., 0.5 rounds up).

flowchart LR
    A[Start Measurement] --> B[Describe Material & Thickness]
    B --> C{Supporting Members?}
    C -- Yes --> D[Measure Separately]
    C -- No --> E[Include in Main Measurement]
    D & E --> F[Calculate Final Value]
    F --> G[Round off as per IS 2-1960]
    G --> H[Record Measurement]

This ensures uniformity and accuracy in measurement and billing for ceilings and linings.

IS 1200 Part 10: General Rules for Measurement of Ceilings and Linings

Key Points from the Code:

• Scope (Clause 1.1):
  Covers measurement methods for ceilings and linings in buildings and civil engineering works.

• Bills of Quantities (Clause 2.5):

  • Must fully describe materials and workmanship.
  • Should accurately represent the work executed.
  • Numerical values must be rounded off as per revised rules (usually nearest mm or decimal place).

• Material Description (Clause 3.1):

  • Specify material type, thickness, and fixing method.
  • Supporting members measured separately in other relevant parts.

• Pattern Work (Clause 3.2):

  • If work follows a specific pattern, it must be clearly stated.

Typical Measurement Specifications:

Rounding Off Rules (Typical Practice):

• Dimensions measured to nearest 10 mm or 0.01 m² for area.
• Quantities rounded to nearest whole number or as specified.

flowchart TD
    A[Start Measurement] --> B{Material Specified?}
    B -- Yes --> C[Record Thickness & Fixing]
    B -- No --> D[Specify Material Details]
    C --> E{Pattern Specified?}
    E -- Yes --> F[Include Pattern Description]
    E -- No --> G[Proceed]
    F --> G
    G --> H[Measure Supporting Members Separately]
    H --> I[Prepare Bill of Quantities]
    I --> J[Apply Rounding Rules]
    J --> K[Complete Measurement]

Summary: IS 1200 Part 10 emphasizes clear description of materials, thickness, fixing methods, and patterns, with supporting members measured separately. Bills must be detailed and rounded correctly.

IS 1200 Part 10: Clubbing of Items — Key Points

• Clubbing of Items (Clause 2.1):
  Items can be clubbed if the detailed breakup aligns with the standard's item descriptions.

• Item Description (Clause 2.3):
  Each item’s description includes:

  • Conveyance, delivery, handling, unloading, storing
  • Fabrication, hoisting
  • Labour for finishing to required shape and size

• Bills of Quantities (Clause 2.5):
  Must fully describe materials, workmanship, and accurately represent the work.

• Measurement Notes (Clause 3.2.1):

  • Work on circular surfaces measured separately.
  • If fixed with screws, mention it explicitly.
  • Straight/raking cutting and waste included in the item.

Practical Summary for Clubbing Items:

This ensures clarity, avoids ambiguity, and maintains consistency in measurement and costing.

flowchart TD
    A[Items to be clubbed] --> B{Agreement on breakup}
    B -- Yes --> C[Clubbing allowed]
    B -- No --> D[Separate measurement]
    C --> E[Include conveyance, handling, fabrication, finishing]
    D --> F[Measure individually]

Note: No explicit formulas are given for clubbing; focus is on detailed descriptions and agreed breakup.

IS 1200 Part 10: Booking of Dimensions – Key Points

• Dimension Order (Clause 2.2):
  Always record dimensions in the order:
  Length → Breadth (Width) → Height (Depth/Thickness)

• Precision (Clause 2.4.1):
  Measure all dimensions to the nearest 0.01 m (1 cm).

• Measurement Rules (Clause 3.4):

  • No deduction for openings ≤ 0.4 m².
  • For openings > 0.4 m², deduct the full area from the measurement.
  • Labour for forming such openings is measured separately.

Summary Table for Booking Dimensions

Example Booking Format

This ensures uniformity and accuracy in measurement for ceilings, linings, and related civil works.

IS 1200 Part 10: Description of Items – Key Points

• Clause 2.3 (Description of Items):
  Each item’s description includes:

  • Conveyance & delivery
  • Handling, unloading, storing
  • Fabrication & hoisting
  • Labour for finishing to required shape & size

• Clause 2.1 (Clubbing of Items):
  Items can be clubbed only if their detailed breakup matches the standard’s item descriptions.

• Clause 2.5 (Bills of Quantities):
  Bills must:

  • Fully describe materials & workmanship
  • Accurately represent the work scope

• Clause 3.1 (Material Description):

  • Specify material type, thickness, fixing method
  • Supporting members measured separately as per relevant IS 1200 parts

Summary Table: Description Components

Note: No specific formulas apply here; focus is on comprehensive, clear item descriptions for accurate measurement and billing.

IS 1200 Part 10 — Key Points on Measurements for Ceilings and Linings

• Measurement Units:
  All works measured net in decimal system (Clause 2.4).

• Precision:
  Dimensions recorded to the nearest 0.01 m (Clause 2.4.1).

• Rounding Off:
  Final measured values rounded as per IS 2-1960 rules, retaining the same number of significant digits as specified (Clause 0.6).

• Scope:
  Applies to ceilings and linings in both buildings and civil engineering works (Clauses 1.1, 0.5.1).

Summary Table

Practical Note:

• Measure net dimensions after fixing the work in place.
• Always use consistent decimal precision for accuracy and compliance.

flowchart LR
    A[Work fixed in place] --> B[Measure dimension]
    B --> C[Record to nearest 0.01 m]
    C --> D[Round off as per IS 2-1960]
    D --> E[Final measurement for billing/approval]

IS 1200 Part 10 focuses on the method of measurement for ceilings and linings, which directly impacts the preparation of Bills of Quantities (BoQ).

Key Points on Bills of Quantities (Clause 2.5)

• BoQ must fully describe materials and workmanship.
• Must accurately represent the work executed.
• Measurements are taken net, in the decimal system.
• Numerical values should be rounded off as per the revised rules (generally to two decimal places for area/volume).

Measurement Rules (Clause 2.4)

• Measurements are made after fixing the work in place.
• Use net dimensions (actual dimensions excluding overlaps or wastage).
• Decimal system is used for all measurements.

Typical BoQ Measurement Units for Ceilings & Linings:

Rounding Off Example:

• Area: Round to 2 decimal places (e.g., 12.345 m² → 12.35 m²)
• Length: Round to 3 decimal places (e.g., 4.567 m → 4.567 m)

Summary Diagram

flowchart TD
    A[Work to be executed] --> B[Measurement in decimal system]
    B --> C[Net dimensions after fixing]
    C --> D[Apply rounding rules]
    D --> E[Prepare Bills of Quantities]
    E --> F[Describe materials and workmanship fully]

Use IS 1200 Part 10 as a guide for precise measurement and description to ensure BoQ accuracy and clarity.

IS 1200 Part 10: Measurement of Ceilings and Linings

Key Specifications:

• Measurement Units:
  All works are measured net in decimal system as fixed in place (Clause 2.4).

• Dimension Accuracy:
  Dimensions must be measured to the nearest 0.01 m (Clause 2.4.1).

• Rounding Off:
  Final measurement values should be rounded off as per IS 2:1960 rules, maintaining the same number of significant figures as specified (Clause 0.6).

Measurement Rules Summary:

Practical Notes:

• Measure fixed-in-place dimensions only.
• Use decimal meters for all linear measurements.
• Apply standard rounding rules to ensure consistency.

flowchart TD
    A[Start Measurement] --> B[Measure dimension in meters]
    B --> C{Is dimension fixed in place?}
    C -- Yes --> D[Record measurement to nearest 0.01 m]
    C -- No --> E[Do not measure]
    D --> F[Round off as per IS 2:1960]
    F --> G[Use value for final measurement]

This ensures uniformity and accuracy in measurement for ceilings and linings as per IS 1200 Part 10.

IS 1200 Part 10: Ceilings and Linings – Key Specifications

1. Materials & Thickness

• Materials: As specified by design (e.g., gypsum boards, plywood, metal sheets).
• Thickness: Should be clearly stated per layer, e.g., 12 mm gypsum board.
• Layers: Number of layers must be indicated if multiple.

2. Fixing Methods

• Fixing methods must be described (e.g., screws, nails, adhesive).
• For insulation boards/slabs, specify if fixed by mechanical fasteners, adhesives, or combination.

3. Measurement Rules (per Clause 3.10)

• Measure area in m².
• State:
  • Type of material
  • Number of layers
  • Thickness of each layer
  • Fixing method

Example Table for Insulation Boards

Summary Diagram of Measurement Process

flowchart TD
    A[Start Measurement] --> B[Identify Material Type]
    B --> C[Count Number of Layers]
    C --> D[Record Thickness of Each Layer]
    D --> E[Note Fixing Method]
    E --> F[Calculate Area in m²]
    F --> G[Document All Details]

Note: Supporting members (e.g., framework) are measured separately as per relevant IS parts.

IS 1200 Part 10: Work Formed to Specific Patterns – Key Points

• Clause 3.2: Any work formed to a specific pattern must be clearly stated in the contract or specifications.

• Clause 3.2.1:

  • Work formed to circular surfaces is measured separately.
  • If fixed with screws, this must be specified.
  • All straight/raking cuts and waste are included with the main item.

• Clause 3.6:

  • Circular cutting and waste are measured in running metres.
  • Thickness and material type must be stated.

• Clause 2.5:

  • Bills of Quantities must fully describe materials, workmanship, and accurately represent the work.

Typical Measurement Summary

Rounding Off Rules (Summary)

• Quantities are rounded off as per IS 1200 general rules (usually nearest 0.01 or as specified).

flowchart LR
    A[Work to be formed] --> B{Specific Pattern?}
    B -- Yes --> C[State pattern explicitly]
    C --> D{Circular Surface?}
    D -- Yes --> E[Measure separately in running metres]
    E --> F[Specify thickness & material]
    D -- No --> G[Include cutting & waste with item]
    B -- No --> G

For detailed measurement and billing, always refer to the exact clauses and ensure clear specification in contract documents.

IS 1200 Part 10: Measurement of Work as Flat Areas

Key Specifications:

• Clause 3.3: All work is measured as flat areas in square metres (m²) unless otherwise specified.
• Clause 3.2.1: Work on curved/circular surfaces is measured separately. Include straight/raking cuts and waste in the main item.
• Clause 2.4.2: Areas are calculated to the nearest 0.01 m².
• Clause 2.4: All measurements are net, decimal-based, and as fixed in place.

Measurement Guidelines:

Formula for Flat Area Measurement:

[ \text{Area} = \text{Length} \times \text{Breadth} \quad (\text{in m}^2) ]

For irregular shapes, divide into simple geometrical shapes, measure each, and sum.

Notes:

• Always measure net area as fixed.
• Round off to 0.01 m².
• For curved surfaces, use actual curved surface area formulas and measure separately.

flowchart TD
    A[Start] --> B{Surface Type?}
    B -->|Flat| C[Measure Length x Breadth]
    B -->|Circular| D[Measure curved surface area separately]
    C --> E[Round to 0.01 m²]
    D --> E
    E --> F[Include cuts & waste in main item]
    F --> G[Record net area]

This ensures consistency and clarity in measurement per IS 1200 Part 10.

IS 1200 Part 10: Openings and Deductions Key Points

• No deduction for openings ≤ 0.4 m²

  • Openings up to 0.4 m² are included in the main measurement; no separate deduction or extra measurement for forming these openings.

• Full deduction for openings > 0.4 m²

  • For openings exceeding 0.4 m², deduct the full area of the opening from the measurement.
  • Labour for forming such openings is measured and paid separately.

Summary Table

Notes:

• Circular surfaces or special shapes are measured separately.
• Cutting and waste for straight/raking edges are included in the main item.

flowchart TD
    A[Opening Area] --> B{Is area ≤ 0.4 m²?}
    B -- Yes --> C[No deduction; included in main measurement]
    B -- No --> D[Full area deducted]
    D --> E[Labour for forming opening measured separately]

This ensures accurate quantity estimation and fair payment for additional work.

IS 1200 Part 10: Boarding Fixed to Curved Surfaces

Key Specifications:

• Width ≤ 15 cm: Boarding fixed to curved surfaces with width not exceeding 15 cm is measured separately (Clause 3.5).
• Measurement Includes: Shooting edges to proper splays (angled cuts) for fitting curved surfaces.
• Circular Surfaces: Work formed to circular surfaces is measured separately; if fixed with screws, this must be specified (Clause 3.2.1).
• Insulation Boards: Measure in m², specifying type, number of layers, thickness, and fixing method (Clause 3.10).
• Edge Finishing: Chamfering/rounding edges and V-groove cutting are measured in running metres (Clause 3.9).

Practical Notes:

• Curved boarding requires precise cutting (shooting edges) to fit the curvature.
• Measurement units:
  • Area (m²) for flat/curved boards.
  • Length (m) for edge treatments.
• Fixing methods (screws, adhesives) influence measurement and specification.

Example Formula for Curved Surface Length:

If radius ( r ) and angle ( \theta ) (in radians) are known, length of curved boarding:

[ L = r \times \theta ]

flowchart LR
    A[Boarding Fixed to Curved Surfaces] --> B{Width ≤ 15 cm?}
    B -- Yes --> C[Measure separately including edge shooting]
    B -- No --> D[Include with main item]
    A --> E{Surface Type}
    E -- Circular --> F[Measure separately, specify fixing]
    E -- Others --> G[Measure as per flat surface]
    A --> H[Edge Treatment]
    H --> I[Chamfering/Rounding measured in running metres]
    H --> J[V-groove cutting measured in running metres]

Summary: For curved boarding ≤15 cm wide, measure separately including edge shooting; specify fixing method on circular surfaces; measure insulation boards by area with full details; edge finishes by length.

IS 1200 Part 10: Circular Cutting and Waste - Key Points

• Measurement Unit: Circular cutting and waste are measured in running metres specifying the thickness and type of material (Clause 3.6).

• Work on Circular Surfaces:

  • Measured separately (Clause 3.2.1).
  • If fixed with screws, mention explicitly.
  • Straight and raking cuts included with the main item.

• Pattern Work: Any specific pattern work must be clearly stated (Clause 3.2).

• Edge Finishing: Chamfering, rounding edges, and V-groove cutting on fibre boarding are also measured in running metres (Clause 3.9).

Practical Formula for Circular Cutting Length:

For a circular cut of diameter ( d ):

[ \text{Length (running metres)} = \pi \times d ]

where ( d ) is in metres.

Summary Table:

flowchart LR
    A[Circular Cutting] --> B[Measure circumference = π × diameter]
    A --> C[Specify thickness & material]
    D[Work on Circular Surfaces] --> E[Measure separately]
    E --> F[Note if fixed with screws]
    G[Chamfering/Rounding Edges] --> H[Measure in running metres]

This ensures clear and consistent measurement for circular cutting and associated waste in construction works.

IS 1200 Part 10: Cover Fillets Over Joints – Key Points

• Measurement:

  • Measured in running metres.
  • Specify material, width, and thickness of fillet.
  • Note if edges are chamfered, rounded, or moulded.
  • Include mitring at junctions in description (Clause 3.7).

• Work on Curved Surfaces:

  • Separate measurement if formed to circular surfaces (Clause 3.2.1).
  • Mention if fixed with screws.
  • Include cutting and waste with the item.

• Boarding on Curved Surfaces:

  • Boards ≤ 15 cm width measured separately (Clause 3.5).
  • Edges to be shot to proper splays.

• Sealing Joints:

  • Measured in running metres (Clause 3.8).
  • Describe sealing method used.

Typical Dimensions for Cover Fillets (Example)

Formula for Fillet Volume (for estimation)

[ V = L \times b \times t ]

• V = Volume of fillet (m³)
• L = Length of fillet (m)
• b = Width of fillet (m)
• t = Thickness of fillet (m)

flowchart LR
    A[Cover Fillet Over Joint] --> B[Measure Length (m)]
    A --> C[Specify Material]
    A --> D[Specify Width & Thickness]
    A --> E[Note Edge Type]
    A --> F[Include Mitring]

Summary: Measure cover fillets in running metres with full details of dimensions and edge profiles, include mitring, and separate measurement for curved surfaces and sealing joints per IS 1200 Pt 10.