Method of Measurement of Building and Civil Engineering Works, Part XII: Plastering and Pointing

IS 1200 Part 12 - Scope & Key Specifications Summary

Scope (Clause 1.1):

• Covers method of measurement for plastering and pointing in buildings and civil engineering works.

Key Measurement Rules (Clause 2.4):

• Dimensions: Measured net as executed, rounded to nearest 0.01 m.
• Areas: Calculated and rounded to nearest 0.01 m².
• Rounding off follows IS 2-1960 guidelines for significant figures.

Preparatory Work (Clause 2.6):

• Included in item description unless specified otherwise (e.g., raking joints, cleaning).

Important Notes:

• The standard aims to unify measurement methods across agencies, enhancing clarity and reducing disputes.
• Each trade is issued as a separate part for specificity.
• This Part XII is the third revision (1976), incorporating amendments since 1971.

Summary Table for Measurement Precision

flowchart TD
    A[Start: Measurement of Plastering & Pointing] --> B[Measure dimensions to 0.01 m]
    B --> C[Calculate area to 0.01 m²]
    C --> D[Include preparatory work in item description]
    D --> E[Round off values per IS 2-1960]
    E --> F[Record net executed measurements]

This concise scope and measurement precision ensure uniformity and clarity in plastering and pointing work measurement.

IS 1200 Part 12 (1976) — General Rules for Measurement of Plastering & Pointing

Key Specifications:

• Measurement Units:
  • Dimensions to nearest 0.01 m
  • Areas to nearest 0.01 m²

Measurement Rules for Openings & Projections (Clause 3.8.1 & 4.6.1):

Rounding Rules:

• Use decimal system rounding as above for all measurements.

Summary Formula for Deduction Area (A_d):

[ A_d = \begin{cases} 0 & \text{if opening} \leq 0.5, m^2 \ \text{Area of opening} & \text{if one face plastered/pointed and reveal width smaller} \ \frac{1}{2} \times \text{Area of opening} & \text{if both faces plastered/pointed with equal reveal widths} \ \text{Area of opening} & \text{if door frame width} \geq \text{wall thickness (each face)} \ \text{Area of opening} & \text{if both faces plastered/pointed with same material (one face only)} \ \end{cases} ]

IS 1200 Part 12: Clubbing of Items - Key Points & Specifications

• Clubbing of Items (Clause 2.1):
  Items can be combined (clubbed) if:

  • Detailed drawings/specifications exist for the combined items.
  • Measurement method is agreed and follows the standard.

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

  • Conveyance, delivery, handling, unloading, storing.
  • Necessary scaffolding, protective covers.
  • Cleaning stains, returning packing materials.
  • Other incidental charges.

• Preparatory Work (Clause 2.6 & 4.7):
  Preparatory tasks like raking out joints, scarifying, cleaning are included in item descriptions unless specified otherwise.

  • Raking out joints can be measured in m² or included in item description.

Measurement & Clubbing Summary Table

Conceptual Flow: Clubbing of Items

flowchart TD
    A[Individual Items] --> B{Are detailed drawings/specs available?}
    B -- Yes --> C{Is measurement method agreed?}
    B -- No --> D[Measure items separately]
    C -- Yes --> E[Items clubbed & measured as per standard]
    C -- No --> D

Use this approach to ensure clarity and compliance in clubbing items per IS 1200 Part 12.

IS 1200 Part 12 (1976) – Booking of Dimensions: Key Points

1. Order of Booking Dimensions (Clause 2.2)

• Sequence: Length → Breadth/Width → Height/Depth/Thickness

2. Measurement Precision (Clause 2.4)

• Dimensions: To nearest 0.01 m
• Areas: To nearest 0.01 m²

3. Ceiling Measurement (Clause 3.9)

• Measure between walls/partitions before plastering
• Deduct width covered by cornices or coves

4. Openings & Deductions/Additions (Clause 4.6.1)

• Deduction Rules for Openings >0.5 m² and ≤3 m²:
  1. If both faces pointed similarly → Deduct on one face only
  2. Different pointing/plaster → Deduct on side with less reveal width
  3. Equal reveal widths → Deduct 50% area on each face
  4. Door frame width ≥ wall thickness → Deduct full opening area on each face
  5. Only one face pointed → Deduct if reveal width on pointed side < unpointed; else no deduction

Summary Table for Deductions

Practical Notes:

IS 1200 Part 12: Description of Items - Key Points

• Clause 2.3: Description includes all related activities:

  • Conveyance, delivery, handling, unloading, storing
  • Necessary scaffolding and protective covers
  • Cleaning stains from floors/walls
  • Return of packings and incidental charges

• Clause 2.1: Items can be clubbed if:

  • Detailed drawings/specifications are prepared
  • Measurement method agreed as per the standard

• Clause 2.5: Bills of Quantities must:

  • Fully describe materials and workmanship
  • Accurately represent the work to be executed

• Clause 2.6: Preparatory work (e.g., raking joints, cleaning) is included in item description unless stated otherwise.

Summary Table for Item Description Components

This ensures comprehensive coverage of all activities related to the item under measurement, avoiding ambiguity in billing and execution.

IS 1200 Part 12: Key Points on Dimensions

• Measurement Precision

  • Lengths, breadths, heights, depths, thicknesses: to nearest 0.01 m
  • Areas: to nearest 0.01 m²

• Booking Order of Dimensions (Clause 2.2)

  • Consistent sequence: Length → Breadth/Width → Height/Depth/Thickness

• Description of Features (Clause 3.1.1)

  • Include arrises, internal rounded angles, external chamfers, or rounded angles ≤ 80 mm girth
  • For features > 80 mm girth, refer Clause 3.4

• Ceiling Measurement (Clause 3.9)

  • Measure between walls/partitions before plastering
  • Deduct width covered by cornices or coves

Summary Table: Dimension Rounding

Measurement Booking Sequence

flowchart LR
    A[Length] --> B[Breadth/Width]
    B --> C[Height/Depth/Thickness]

This ensures uniformity and clarity in measurement recording for building works.

IS 1200 Part 12 (1976) – Bills of Quantities: Key Points

• Measurement Precision:

  • Dimensions measured net as executed.
  • Lengths to nearest 0.01 m.
  • Areas to nearest 0.01 m² (Clause 2.4).

• Description Requirements (Clause 2.5):

  • Items must fully describe materials and workmanship.
  • Must accurately represent the executed work.

• Material Proportions & Types (Clause 4.1):

  • Material proportions clearly stated.
  • Different types of pointing measured separately.
  • Pointing on various surfaces (walls, floors, roofs) measured separately with type/material specified.

Typical Measurement & Quantity Calculation Formulae

Example:

[ \text{Area} = L \times B \quad \text{(to nearest 0.01 m²)} ]

[ \text{Volume of plaster} = \text{Area} \times \text{Thickness} ]

Summary for Bills of Quantities Preparation

• Use decimal system for all measurements.
• Clearly define material types and workmanship standards.
• Separate measurements for different pointing types and surfaces.
• Round off values as per IS 1200 rules.

flowchart TD
    A[Measurement of Work] --> B[Length to 0.01 m]
    A --> C[Area to 0.01 m²]
    C --> D[Volume (if applicable)]
    B --> E[Record net executed dimensions]
    D --> F[Calculate quantities]
    F --> G[Prepare Bills of Quantities]
    G --> H[Describe materials & workmanship]
``

IS 1200 Part 12 (1976) — Preparatory Work for Plastering and Pointing

Key Points from Clause 2.6 (Preparatory Work)

• Preparatory work includes:
  • Raking out joints
  • Scarifying surfaces
  • Cleaning surfaces before plastering/pointing
• These are included in the item description unless otherwise specified.
• No separate measurement or rate unless explicitly mentioned.

Measurement Rules (Clause 2.4)

• Dimensions measured to nearest 0.01 m
• Areas worked out to nearest 0.01 m²
• Measurements are net as executed (actual finished work)

Summary Table for Preparatory Work

Notes:

• Preparatory work is essential for good adhesion of plaster/pointing.
• No separate billing unless specified.
• Dimensions and areas measured as per IS 1200 Part 12 rules.

flowchart TD
    A[Start: Surface to be plastered/pointed] --> B{Preparatory Work Needed?}
    B -- Yes --> C[Raking out joints]
    B -- Yes --> D[Scarifying surface]
    B -- Yes --> E[Cleaning surface]
    C --> F[Plastering/Pointing]
    D --> F
    E --> F
    B -- No --> F
    F --> G[Measurement: Net dimensions/areas as per IS 1200 Part 12]

This ensures uniform measurement and costing for preparatory work as part of plastering/pointing in civil engineering projects.

IS 1200 Part 12 (1976) – Measurement of Plastering: Key Points

1. Measurement Dimensions (Clause 3.12)

• Length: Between walls or partitions (measured before plastering).
• Height: From top of floor or skirting to ceiling.
• Deductions: Depth of cornices or coves must be deducted from height.

2. Height Segmentation (Clause 3.5)

• For plastering above 10 m height, measure in 5 m stages.
• Interior plastering in buildings: measure separately for each storey.

3. General Scope (Clause 1.1)

• Covers method of measurement for plastering and pointing in buildings and civil works.

Typical Formula for Plastering Area:

[ \text{Plastering Area} = \text{Length} \times \text{Height} - \text{Area of openings (doors, windows)} - \text{Cornices/coves deductions} ]

Summary Table for Measurement

flowchart LR
    A[Start Measurement] --> B{Height > 10m?}
    B -- Yes --> C[Divide into 5m stages]
    B -- No --> D[Measure full height]
    C --> E[Measure length between walls]
    D --> E
    E --> F[Subtract cornices/coves depth]
    F --> G[Calculate plastering area]

This method ensures accurate and standardized measurement for billing and quality control per IS 1200 Part 12.

IS 1200 Part 12: Classification & Description of Plaster Work

Key Specifications (Clause 3.1 & 3.1.2)

• Classification by material: Each plaster type measured separately.

• Details to specify for each classification:

  • a) Mortar mix (e.g., cement:sand ratio)
  • b) Number of coats & thickness of each coat (e.g., 2 coats, 12 mm total)
  • c) Surface treatment (e.g., smooth, rough, trowelled)
  • d) Base nature (e.g., brick, concrete, metal lath)
  • e) Curved work details (radius for conical/spherical/elliptical surfaces)
  • f) Special base treatments (e.g., bonding agents)

• Fibrous plaster (Clause 3.1.2):

  • Specify application method
  • Treatment of joints

Measurement Rules (Clause 3.5)

• For plastering above 10 m height, measure in 5 m vertical stages.
• Interior plastering in buildings: measure per storey.

Typical Mortar Mix Table (Example)

flowchart TD
    A[Plaster Work] --> B[Classification by Material]
    B --> C[Mortar Mix]
    B --> D[Coats & Thickness]
    B --> E[Surface Treatment]
    B --> F[Base Nature]
    B --> G[Curved Work Details]
    B --> H[Special Base Treatment]
    B --> I[Fibrous Plaster Method & Joint Treatment]

This ensures clear, standardized measurement and description for plastering in civil engineering works per IS 1200 Part 12.

IS 1200 Part 12: Measurement of Isolated Widths and Mouldings

Key Specifications:

• Isolated widths or mouldings (bands, cornices, panels, chamfers, rounded angles > 80 mm girth):

  • Width/girth ≤ 30 cm: Measured in running metres (Clause 3.4a)
  • Width/girth > 30 cm: Measured in square metres (Clause 3.4b)

• Ribs and mouldings on ceilings:

  • Measured as cornices (per Clause 3.4)
  • Deduct from plastering if width/girth > 15 cm (Clause 3.11)

• Mouldings, architraves, ceiling ribs, cornices on pilasters/openings:

  • Measured separately as per Clause 3.4 (Clause 3.12.2)

• Moulded cornices and coves:

  • Measured in square metres by multiplying length × girth (Clause 3.14)

Summary Table:

Formula for Area of Moulded Cornices and Coves:

[ \text{Area} = \text{Length} \times \text{Girth} ]

flowchart TD
    A[Isolated Widths & Mouldings] --> B{Width/Girth ≤ 30 cm?}
    B -- Yes --> C[Measure in Running Metres]
    B -- No --> D[Measure in Square Metres]

IS 1200 Part 12 - Measurement of Plastering at Height: Key Points

• Measurement Stages for Height > 10 m (Clause 3.5):

  • Plastering above 10 m shall be measured separately in 5 m height stages.
  • For interior plastering in buildings, measure separately for each storey.

• Measurement Dimensions for Wall Plastering (Clause 3.12):

  • Length: Measured between walls or partitions before plastering.
  • Height: From top of floor/skirting to ceiling.
  • Deduct depth of cornices or coves if present.

Formula for Plastering Quantity (Area)

[ \text{Plastering Area} = \text{Length} \times \text{Height} - \text{Area of Openings (doors/windows)} - \text{Cornices/Coves Depth} ]

Measurement Summary Table

flowchart TD
    A[Start Measurement] --> B{Height > 10m?}
    B -- Yes --> C[Divide height into 5m stages]
    B -- No --> D[Measure full height]
    C --> E[Measure length between walls (pre-plaster)]
    D --> E
    E --> F[Measure height from floor/skirting to ceiling]
    F --> G[Subtract cornices/coves depth]
    G --> H[Calculate plastering area]
    H --> I[Record separately per stage or storey]

This ensures accurate, standardized measurement for plastering works at heights as per IS 1200 Part 12.

IS 1200 Part 12: Deductions and Additions for Openings and Projections

Key Specifications:

Notes:

• Exclude extra width of rebated reveals when calculating opening areas.
• For plaster/pointing deductions, consider the type and width of reveals on each face.

Summary Diagram:

flowchart TD
    A[Opening Area] -->|≤ 0.5 m²| B[No Deduction or Addition]
    A -->|> 0.5 & ≤ 3 m²| C[Deduct based on plaster/pointing & reveal width]
    A -->|> 3 m²| D[Deduct opening on each face + Add jambs, soffits, sills]

    C --> E{Faces plaster/pointing?}
    E -->|Same| F[Deduct one face only]
    E -->|Different| G[Deduct side with smaller reveal width]
    E -->|Equal reveal widths| H[Deduct 50% from each face]
    E -->|Door frame = or > wall thickness| I[Full deduction from each face]

This concise

IS 1200 Part 12 (1976): Measurement of Plastering on Lathing

Key Specifications:

• Measurement basis (Clause 3.12):

  • Length: Between walls/partitions (before plastering).
  • Height: From top of floor/skirting to ceiling.
  • Deduct depth of cornices/coves if any.

• Separate measurement (Clause 3.16):

  • Measure plastering on lathing separately.
  • State number of coats and thickness of each coat.

• Height considerations (Clause 3.5):

  • For plastering >10m above ground, measure in 5m stages.
  • Interior plastering in buildings: measure per storey.

Practical Measurement Formula:

[ \text{Plastering Area} = \text{Length} \times \text{Height} - \text{Area of openings/cornices} ]

• For plaster on lathing:
  [ \text{Total Thickness} = \sum (\text{Thickness of each coat}) ]

Summary Table:

flowchart TD
    A[Start Measurement] --> B{Measure Length}
    B --> C[Between walls/partitions]
    A --> D{Measure Height}
    D --> E[Floor/skirting to ceiling]
    F[Calculate Area] --> G[Length x Height]
    G --> H{Deduct Cornices/Coves}
    H --> I[Net Area]
    I --> J{Plaster on Lathing?}
    J -->|Yes| K[Measure coats & thickness separately]
    J -->|No| L[Record normal plastering area]

This ensures accurate quantification as per IS 1200 Part 12.

IS 1200 Part 12: Measurement of Pointing

Key Specifications:

• Unit of Measurement: Pointing is measured in square metres (m²) (Clause 4.4).
• Separate Measurement: Different types of pointing (e.g., flush, recessed) and surfaces (walls, floors, roofs) are measured separately (Clause 4.1).
• Material Description: Proportions and types of materials used in pointing must be described (Clause 4.1).
• Removal of Pointing: Removing existing pointing is also measured in square metres (Clause 4.5).

Measurement Guidelines:

• Measure the area of the surface to be pointed.
• Exclude overlaps or double measurements when pointing is done on adjacent surfaces.
• Clearly specify the type of pointing (e.g., cement mortar, lime mortar) and the surface type (brick wall, stone wall, etc.).

Summary Table:

flowchart TD
    A[Surface to be Pointed] --> B[Measure Area (m²)]
    B --> C{Type of Pointing}
    C -->|Flush| D[Measure separately]
    C -->|Recessed| E[Measure separately]
    B --> F[Describe Material Proportions]
    G[Removal of Pointing] --> H[Measure Area (m²)]

This ensures accurate and standardized measurement for billing and quality control.