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Equivalent Metric Units For Scales Dimensions And Quantities In General Construction Work

IS 965:1963 establishes equivalent metric units for scales, dimensions, and quantities commonly used in general construction work in India. This standard facilitates the transition from traditional foot-pound-second (fps) units to metric units, providing engineers, architects, and construction professionals with standardized conversions for measurements, materials, and quantities in building projects. It covers a wide range of construction elements including excavation, masonry, plastering, joinery, and carriage of materials, ensuring consistency and ease of communication in metric terms across the construction industry.

15Sections
240Clauses Indexed
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1963Edition
Building Construction Practices including Painting Varnishing and Allied FinishingCategory
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What This Standard Covers

IS 965:1963 establishes equivalent metric units for scales, dimensions, and quantities commonly used in general construction work in India. This standard facilitates the transition from traditional foot-pound-second (fps) units to metric units, providing engineers, architects, and construction professionals with standardized conversions for measurements, materials, and quantities in building projects. It covers a wide range of construction elements including excavation, masonry, plastering, joinery, and carriage of materials, ensuring consistency and ease of communication in metric terms across the construction industry.

Who Uses This Standard

  • Civil Engineers
  • Structural Engineers
  • Architects
  • Quantity Surveyors
  • Construction Project Managers
  • Draftsmen and CAD Technicians
  • Public Works Department Officials

Key Topics Covered

Conversion of scales from fps to metric units
Equivalent metric units for excavation and earthwork
Metric units for brickwork and stone masonry
Standardized metric measurements for plastering and pointing
Metric dimensions for woodwork and joinery
Metric units for steel and iron work
Carriage of construction materials in metric units
Metric units for glazing and flooring finishes
Weights and strength of materials in metric terms
Metric units for construction drawings and plans
Standardized metric units for road and drainage works
Guidelines for metric units in miscellaneous construction activities

Table of Contents

1Scope

IS 965 - Scope Summary & Key Specifications

  • Scope (Clause 1): Defines standard scales, dimensions, quantities, weights, and strengths for building and architectural survey plans and drawings.

  • Survey Scales (Clause 2): Includes topographical maps, town surveys, large-scale layouts, working drawings (plans, elevations, sections), and enlarged details.

  • Dimensions (Clause 4): Specifies standard sizes for flooring, walling, roofing, hardware, sanitary appliances, pipes, and miscellaneous components.

  • Quantities (Clause 5): Covers measurement methods for excavation, concrete, brickwork, woodwork, steel, roofing, plastering, painting, plumbing, electrical work, roadwork, demolition, etc.

  • Weights & Strengths of Materials (Clause 7): Provides conversion factors from fps to metric units and standard values for weights, densities, compressive & tensile strengths, stresses, pressures, moments of inertia, and section moduli.

Key Conversion Factors (fps to Metric)

Propertyfps UnitMetric UnitConversion Factor
Weightlbkg0.454
Compressive/Tensile Strengthlb/in²kg/cm²0.070
Moment of Inertiain⁴cm⁴41.623
Section Modulusin³cm³16.387
Hydraulic Pressure (head)ftm0.305

Typical Dimension Categories

  • Flooring, Walling, Roofing Materials
  • Builder's Hardware
  • Sanitary Appliances
  • Pipes and Gutters
  • Miscellaneous Components

flowchart LR
    A[Scope: IS 965] --> B[Survey Scales]
    A --> C[Dimensions]
    A --> D[Quantities]
    A --> E[Weights & Strengths]
    B --> B1[Topographical Maps]
    B --> B2[Town Surveys]
    C --> C1[Flooring]
    C --> C2[Walling]
    C --> C3[Roofing]
    D --> D1[Concrete]
    D --> D2[Brickwork]
    E --> E1[Conversion Factors]
    E -->
2Working Drawings: Plans, Elevations and Sections

IS 965 - Working Drawings: Plans, Elevations, and Sections

Key Specifications (Clause 2.5)

  • Working Drawings include:
    • Plans: Horizontal views showing layout.
    • Elevations: Vertical views showing exterior/interior faces.
    • Sections: Cut-through views showing internal details.

Recommended Scales (Clause 2.5)

Drawing TypeMetric Scale Recommended
General Plans1:200, 1:100
Detailed Plans1:50
Elevations & Sections1:100, 1:50

Note: Use larger scales (e.g., 1:50) for detailed parts or complex sections.

Drawing Guidelines:

  • Clarity: All dimensions, materials, and component details must be legible.
  • Consistency: Use uniform line weights and symbols.
  • Annotations: Clearly indicate levels, dimensions, and material specifications.

Summary Table of Scales for Working Drawings

Drawing TypeScale (Metric)
Preliminary SketchesDependent on purpose
Working Plans1:200, 1:100
Elevations & Sections1:100, 1:50
Large Scale DetailsLarger than 1:50

graph TD
  A[Working Drawings] --> B[Plans]
  A --> C[Elevations]
  A --> D[Sections]
  B --> E[Scale 1:200, 1:100]
  C --> F[Scale 1:100, 1:50]
  D --> G[Scale 1:100, 1:50]

Use IS 965 scales to ensure clarity and uniformity in architectural and structural drawings.

3Walling Materials

IS 965: Walling Materials - Key Specifications & Tables

1. Units for Walling Materials (Clause 4.2)

Material Typefps Units UsedMetric Units to be Used
Stone blocks, bricksDimensions in inches (in.)Dimensions in mm or cm
Wall boardsLength in ft, Breadth & Thickness in in.Length in m, Breadth & Thickness in mm or cm
PlasterLength & Breadth in ft, Thickness in in.Length & Breadth in m, Thickness in mm

2. Concrete & Masonry Quantities (Clause 9.29 - Table 5.3)

Itemfps UnitsCorresponding Metric ValueMetric Units to be Used
Brick/stone edging100 rft / 100 ft³30.5 m / 2.83 m³10 m / m³
Filleting100 rft30.5 m10 m
Brickwork/stone masonry around steel joists100 ft²2.83 m³
Extra labour (stone masonry around steel joists)100 ft²9.29 m³10 m³
Dressed stonework (sunk faces, moulded cornices)ft³9.3 dm³10 dm³
Levelling up in stonework (lime/cement)100 ft³9.29 m³10 m³
Dressing to archesft³9.3 dm³10 dm³
Dressed stoneworkft³28 dm³10 dm³
Angles in facings (external angles)rft0.305 mm
Boulder work100 ft³2.83 m³

Notes:

  • rft = running feet, ft³ = cubic feet,
4Builder's Hardware

IS 965 - Builder's Hardware: Key Specifications & Units

Clause 4.4 Builder's Hardware covers:

ItemUnits (fps)Metric Units to be Used
1) Expanded metalSize of mesh (in.)Size of mesh (mm)
Strand dimensions (in.)Strand dimensions (mm)
2) WiresLength (ft)Length (m)
Diameter (SWG)Diameter (mm)
3) Wire productsLength (ft or in.)Length (m or cm)
Diameter (SWG)Diameter (mm)
4) Mild steel barsLength (ft)Length (m)
Diameter or side (in.)Diameter or side (mm)
5) Rivets, bolts, nuts, washersAll dimensions (in.)All dimensions (mm)
6) Rolled steel sectionsLength (ft)Length (m)
7) Tower bolts, hinges, handles, etc--

Additional Notes from Clause 5.6 (Steel & Iron Work):

  • Quantities like weight in cwt convert to quintal (1 cwt = 0.508 quintal).
  • Areas in ft² convert to dm² or m² (e.g., 100 ft² = 9.29 m²).
  • Lengths in rft convert to meters (1 rft = 0.305 m).

Summary Table for Common Hardware Dimensions

Hardware TypeTypical Dimensions (Metric)Notes
Expanded MetalMesh size & strand in mmUse mm for precision
WireDiameter in mm, length in mDiameter often in SWG converted
Steel BarsDiameter/side in mm, length mStandard bar sizes apply
Rivets/Bolts/NutsDimensions in mmFollow standard hardware specs

Conversion Formulae

  • Length: ft × 0.3048 = meters (m)
  • Diameter: SW
5Plastering and Pointing

IS 965 - Plastering and Pointing Key Specifications

1. Quantities & Units Conversion (Clause 5.10, Table 5.10)

Work Descriptionfps Units UsedCorresponding Metric ValueMetric Units to Use
Plastering & pointing generally100 ft²9.29 m²10 m²
Pointing in single detached joints100 rft30.5 m10 m
Raking out joints100 ft²9.29 m²10 m²
Plastering bands ≤ 30 cm width (per cm depth & mm projection)100 rft30.5 m10 m
Stone imitation100 ft²9.29 m²10 m²
Flush or staff beads100 rft30.5 m10 m

2. Notes:

  • rft = running feet
  • For plastering bands, depth is in cm and projection in mm.
  • Metric units standardize to multiples of 10 for ease in estimation.

3. Practical Use:

  • Use 10 m² as a base unit for plastering and pointing area estimation.
  • For linear works like pointing or beads, use 10 m lengths.
  • For volumetric works (not in this table), convert using 1 ft³ = 0.0283 m³ as per IS 965.

Summary Formula for Area Conversion:

[ \text{Area (m}^2) = \text{Area (ft}^2) \times 0.0929 ]

Summary Formula for Length Conversion:

[ \text{Length (m)} = \text{Length (ft)} \times 0.305 ]


flowchart LR
    A[Plastering & Pointing] --> B[Area Measurement]
    A --> C[Linear Measurement]
    B --> D[Use 10 m² unit]
    C --> E[Use 10 m unit]
    D --> F[Estimate quantities]
    E --> F

**Use

6Carriage of Materials

IS 965: Carriage of Materials - Key Specifications & Conversions

1. Material Types Covered (Clause 2.83)

  • Lime, moorum, building rubbish, earth, manure, sludge, excavated earth
  • Sand, stone aggregates, soling stone, etc.
  • Bricks, tiles, etc.
  • Cement, stone blocks, steel sections, pipes (<100 mm size), heavy materials
  • Tar, bitumen, etc.

2. Unit Conversions for Carriage Materials (Clause 91.4, Table 7)

Quantity TypeFPS UnitMetric UnitConversion Factor (FPS → Metric)
Weight (ton)tontonne1.016
Weight (cwt)cwtquintal (q)0.508
Weight (lb)lbkg0.454
Weight (oz)ozg28.350
Weight per unit lengthlb/yd, lb/ftkg/m0.496 (lb/yd), 1.488 (lb/ft)
Densitylb/ft³g/cm³16.018
Compressive strengthlb/in²kg/cm²0.070
Tensile strengthlb/in²kg/cm²0.070
Hydraulic pressure (head)ftm0.305
Bearing pressurestons/ft², lb/ft²tonne/m², kg/m²10.937 (tons/ft²), 4.882 (lb/ft²)

3. Practical Notes

  • Use metric units for all carriage calculations as per IS 965 recommendations.
  • For weight estimation, convert FPS units using above factors for accurate load and transport planning.
  • Refer to Clause 5.6 for steel and iron work carriage conversions (e.g., cwt to quintal, ft² to m²).

Summary Diagram: Material Carriage Flow

flowchart TD
    A[Material
7Weights and Strength of Materials

IS 965 - Weights and Strength of Materials (Clause 7 & 5.6)

Key Conversion Factors (fps → Metric)

Propertyfps UnitMetric UnitConversion Factor
Weighttontonne1.016
Weightcwtquintal (q)0.508
Weightlbkg0.454
Weightozgrams (g)28.350
Weight per unit lengthlb/ftkg/m1.488
Densitylb/ft³g/cm³16.018
Compressive strengthlb/in²kg/cm²0.070
Tensile strengthlb/in²kg/cm²0.070
Stresses (tensile, compressive, shear)lb/in²kg/cm²0.070
Hydraulic pressure (head)ftm0.305
Atmospheric pressure (water head)ftm0.305
Moment of inertiain⁴cm⁴41.623
Section modulusin³cm³16.387
Radius of gyrationincm or mm25.4
Bending momentft-lbkg-cm13.825

Steel & Iron Work Units (Clause 5.6)

Itemfps UnitMetric UnitConversion Factor
Plates, flats, angles, barscwtquintal (q)0.508
Mild steel beams, joistston, cwttonne, quintal1.016, 0.508
Railingsrftm0.305
Flue pipes100 rft30.5 m
8Miscellaneous

IS 965 - Clause 4.10 & Related Tables: Miscellaneous Key Formulas & Specifications


1. Units & Dimensions (Clause 4.10)

ParameterFPS Units Currently UsedMetric Units to be Used
Aggregates for concrete (size)in.mm
Timber Lengthftm or cm
Timber Girthin.cm
Timber Cross-sectional dimensionsin.mm

2. Conversion Factors for Weights, Strengths & Measures (Clause 7)

PropertyFPS UnitMetric UnitConversion Factor (FPS → Metric)
Weighttontonne1.016
Weightlbkg0.454
Weight per unit lengthlb/ftkg/m1.488
Densitylb/ft³g/cm³16.018
Compressive Strengthlb/in²kg/cm²0.070
Tensile Strengthlb/in²kg/cm²0.070
Stresses (tensile, compressive)lb/in²kg/cm²0.070
Moment of inertiain⁴cm⁴41.623
Section modulusin³cm³16.387
Atmospheric pressure (water head)ftm0.305
Velocityft/sm/s0.305
PowerhpkW0.746

3. Important Notes

  • Metrication: IS 965 promotes metric units for all measurements.
  • Use conversion factors to switch from FPS to metric units accurately.
  • Tables 5 to 8 in IS 965 provide detailed quantities and measurement methods for various materials and work types.

Summary Diagram: Unit Conversion Flow

flowchart LR
    FPS_Units -->|Apply Conversion
9Excavation and Earthwork

IS 965 - Excavation and Earthwork (Clause 5.2) Key Specifications

Item DescriptionFPS UnitMetric EquivalentMetric Unit to Use
1) Rough excavation, foundation trenches1,000 ft³ / 100 ft³28.3 m³ / 2.83 m³10 m³ / m³
2) Surface excavation100 ft² / yd²0.765 m³ / 9.29 m³m² / 10 m²
3) Surface dressing1,000 ft²92.9 m²100 m²
4) Trenches for pipes, cables, etc.100 rft (running ft)30.5 mm
5) Return, fill, and ram100 ft³2.83 m³
6) Forming embankments1,000 ft³ / 100 ft³28.3 m³ / 2.83 m³10 m³ / m³
7) Removal distance (lead)100 rft30.5 m50 m or 10 m
8) Lifting height (lift)5 ft1.52 m1 m or 1.5 m
9) Planking and strutting100 ft²9.29 m²10 m² or m²
10) Puddling100 ft³2.83 m³
11) Hard core, floors (shingle, ballast)100 ft³2.83 m³
12) Filling in soakage pits100 ft³2.83 m³
13) Hand-packed filling (stone, brick)100 ft³2.83 m³

Notes

10Brickwork and Stone Masonry

IS 965: Key Specifications & Tables for Brickwork and Stone Masonry

1. Dimensions & Units (Clause 4.2)

  • Stone blocks, bricks: Dimensions in mm or cm (instead of inches)
  • Wall boards: Length in m, Breadth in mm or cm, Thickness in mm
  • Plaster: Length & breadth in m, Thickness in mm

2. Quantities & Labour (Clause 9.29, Table 5.3)

Itemfps UnitsMetric EquivalentMetric Units
Brick/Stone edging100 rft / 100 ft³30.5 m / 2.83 m³10 m / m³
Filleting100 rft30.5 m10 m
Brick/Stone masonry around steel joists100 ft³2.83 m³
Extra labour around steel joists100 ft³9.29 m³10 m³
Dressed stonework (sunk faces, moulded cornices)ft³9.3 dm³10 dm³
Levelling up in stonework (lime/cement concrete)100 ft³9.29 m³10 m³
Boulder work100 ft³2.83 m³

3. Practical Notes:

  • Use metric units consistently for all measurements.
  • Labour and material quantities are often expressed per 100 ft³ or 100 rft (running feet).
  • Dressing and finishing details have specific volume allowances (dm³ or m³).

Visual Summary: Unit Conversion Flow

flowchart LR
    A[fps Units] --> B[Metric Units]
    B --> C{Type of Work}
    C -->|Brickwork| D[Length: m, Volume: m³]
    C -->|Stone Masonry| E[Length: m, Volume: m³]
    C -->|Dressing| F[Volume: dm³ or m³]

Use these tables and unit conversions for accurate estimation and specification of brickwork and stone masonry in IS 965 compliance.

11Woodwork and Joinery

IS 965 - Woodwork and Joinery: Key Measurement Specifications

Item DescriptionFPS Units UsedCorresponding Metric ValueMetric Units to be Used
Width of surfaces1/2 in.1.27 cmcm
Width/thickness of single boards1/8 in.3.2 mmmm
Framework volume1 ft³28 dm³10 dm³
Shoring and strutting volume100 ft³2.83 m³
Rough boarding (temporary partition) area100 ft²9.29 m²10 m²
Centering to arches area100 ft²9.29 m²10 m²
Concrete formwork volume100 ft³9.29 m³10 m³
Moulding volume1 ft³9.3 dm³10 dm³
Fillets length100 rft30.5 m10 m
Planing volume100 ft³9.29 m³10 m³
Rebates, tongues, grooves length100 rft30.5 m10 m
Roof battens area and volume100 ft², 1 ft³9.29 m², 28 dm³10 m², 10 dm³
Trellis work area100 ft²9.29 m²10 m²
Door/window chowkats volume1 ft³28 dm³10 dm³
Staircase components lengthrft (running feet)0.305 mm

Notes:

  • 1 ft = 0.305 m; 1 ft² = 0.0929 m²; 1 ft³ = 0.
12Steel and Iron Work

IS 965 - Steel and Iron Work: Key Formulas, Tables & Specs

1. Unit Conversions for Steel & Iron Work (Clause 5.6)

Item DescriptionFPS UnitMetric UnitConversion Factor
Plates, flats, angles, bars, channels etc.cwtquintal (q)1 cwt = 0.508 q
Mild steel beams, joistston, cwttonne, quintal1 ton = 1.016 tonnes; 1 cwt = 0.508 q
Gates, rolling shutters, steel doors & windowsft²dm² (decimeter²)1 ft² = 9.3 dm²
Railings, wire fencingrft (running ft)meters (m)1 rft = 0.305 m
Flue pipes, wire netting, wire mattresses100 rft, 100 ft², 100 ft³10 m, 10 m², 10 m³100 rft = 30.5 m; 100 ft² = 9.29 m²; 100 ft³ = 9.29 m³
Bolts, nuts, washerscwtquintal1 cwt = 0.508 q

2. Weights and Strength of Materials (Clause 91.4)

PropertyFPS UnitMetric UnitConversion Factor
Weighttontonne1 ton = 1.016 tonnes
Weightcwtquintal (q)1 cwt = 0.508 quintal
Weightlbkg1 lb = 0.454 kg
Weight per unit lengthlb/ft, lb/ydkg/m1 lb/ft = 1.488 kg/m
Densitylb/ft³g/cm³1 lb/ft³ = 16.018 g/cm³
13Glazing

IS 965 - Glazing: Key Specifications & Units

Clause 5.12 Glazing primarily specifies units for measurement and conversion for glazing works:

Descriptionfps Units UsedMetric EquivalentMetric Units to Use
1) General area measurement100 ft²9.29 m²10 m² or m²
2) Hacking out broken glass100 ft²9.29 m²10 m² or m²

Important Notes:

  • Area for glazing work is generally measured in square meters (m²).
  • Conversion:
    [ 1 \text{ ft}^2 = 0.0929 \text{ m}^2 ]
  • For practical use, round to 10 m² for ease in specifications and billing.

Related Dimensions (From Clause 4.3 for glass panes, panels):

Componentfps UnitsMetric Units to Use
Glass panes, panels, shuttersin. or ftmm or cm

Summary:

  • Use for glazing area.
  • Use mm or cm for thickness and linear dimensions of glass panes.
  • Follow metric units for all new works as per IS 965 recommendations.
flowchart LR
    A[Glazing Work] --> B[Measure Area in ft²]
    B --> C[Convert to m² (1 ft² = 0.0929 m²)]
    C --> D[Round to 10 m² for specification]
    A --> E[Measure thickness and dimensions in in. or ft]
    E --> F[Convert to mm or cm]

This ensures uniformity and compliance with IS 965 standards for glazing.

14Pavings and Floor Finishes

IS 965: Pavings and Floor Finishes — Key Formulas & Tables

1. Unit Conversion Table (Clause 5.9)

Itemfps Units UsedMetric EquivalentMetric Units to Use
Paving and floor finishes100 ft²9.29 m²10 m²
Treads, risers, etc.ft²9.3 dm³10 dm³
Moulded nosingsrft (running feet)0.305 mm
Surface finish to concrete floors100 ft²9.29 m²10 m²
Cement-concrete coved skirting100 rft30.5 mm
Building paper100 ft²9.29 m²10 m²
Underlayer of sand to paving100 ft³2.83 m³
Granolithic finish100 ft²9.29 m²10 m²
Terrazzo laid on floors100 ft²9.29 m²10 m²
Extra for internal/external angles in terrazzo floor100 rft30.5 m10 m
Narrow bands in terrazzo finish100 rft30.5 m10 m
Coloured topping to cement floors100 ft²9.29 m²10 m²
Mosaic finish100 ft²9.29 m²10 m²
Brick paving (raking/circular fair cutting)100 rft30.5 m10 m
Wood block paving & parquet finish: forming expansion joints per mm width & cm depth100 rft30.5 m10 m
Asphalt paving: internal angle fillets, skirting100 rft30.5
15Appendix A: Basic Metric Units

IS 965 Appendix A: Basic Metric Units - Key Conversion Tables & Specifications

1. Weights and Strength of Materials (Clause 91.4)

QuantityFPS UnitMetric UnitConversion Factor (FPS → Metric)
Weighttontonne1.016
Weightcwtquintal (q)0.508
Weightlbkg0.454
Weightozg28.350
Weight per unit lengthlb/yd, lb/ftkg/m0.496 (lb/yd), 1.488 (lb/ft)
Densitylb/ft³g/cm³16.018
Compressive strengthlb/in²kg/cm²0.070
Tensile strengthlb/in²kg/cm²0.070
Stresses (tensile, compressive, shear)lb/in², tons/in²kg/cm², kg/mm²0.070, 1.575
Hydraulic pressure (head)ftm0.305
Atmospheric pressure (water head)ftm0.305
Atmospheric pressure (mercury head)inmm25.4
Moment of inertiain⁴cm⁴41.623
Section modulusin³cm³16.387

2. Miscellaneous Units (Clause 4.10 & 2.54)

QuantityFPS UnitMetric UnitConversion Factor
Aggregate sizeinmm25.4
Timber lengthftm or cm0.305 (m), 30.48 (cm)
Timber girthincm2.54
Road lengthmile

Popular Questions About IS 965

?What are the recommended metric equivalents for common fps scales used in construction drawings?

IS 965: Recommended Metric Equivalents for Common fps Scales

fps Scale (Construction Drawings)Equivalent Metric Scale
1 in. = 64 ft (Large Scale Surveys)1 cm = 10 m
(Alternate)1 cm = 20 m (no direct fps equivalent)
½ in. = 1 ft (1:24) (General Details)1 cm = 20 cm (1:20)
1 in. = 1 ft (1:12) (General Details)1 cm = 10 cm (1:10)
Working Drawings (Plans, Elevations)1:200, 1:100, 1:50 (metric ratios)

Key Notes:

  • Metric scales use cm and m units for clarity and ease.
  • The metric scale 1 cm = 20 m is allowed even if no direct fps equivalent exists.
  • Conversion ensures ease in transitioning from fps to metric without losing drawing accuracy.
Loading diagram...

This helps maintain consistency in construction drawings when converting scales.

?How does IS 965 define metric units for excavation and earthwork quantities?

IS 965: Metric Units for Excavation and Earthwork Quantities

IS 965 provides equivalent metric units for common excavation and earthwork quantities to replace traditional fps units, ensuring simplicity and ease of use in estimates.

Key Metric Units (Clause 5.2 Table Summary):

ItemTraditional UnitMetric EquivalentMetric Unit to Use
Rough excavation, foundation trenches1000 ft³, 100 ft³28.3 m³, 2.83 m³10 m³, 1 m³
Surface excavation100 ft², yd²0.765 m², 9.29 m²m², 10 m²
Trenches for pipes, cables100 rft (running feet)30.5 mm
Return, fill and ram100 ft³2.83 m³
Lead (distance of removal)100 rft30.5 m50 m or 10 m
Lift (height of lifting)5 ft1.52 m1 m or 1.5 m
Planking and strutting100 ft²9.29 m²10 m² or m²
Puddling, filling, hardcore, floors100 ft³2.83 m³

Notes:

  • Metric units chosen are rounded for convenience (e.g., 10 m³ instead of 28.3 m³ for rough excavation).
  • The goal is to maintain simple, whole-number relationships for ease of estimation and familiarization.
  • This standard aids smooth transition from fps to metric in construction work.

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?Which metric units should be used for plastering and pointing as per this standard?

As per IS 965 - 1963, Clause 5.10 and related tables, the metric units for plastering and pointing should be:

ItemMetric Units to be Used
1) Plastering and pointing generally10 m²
2) Pointing in single detached joints10 m
3) Raking out joints10 m²
4) Plastering bands (≤30 cm width) per cm depth and mm projection10 m
5) Stone imitation10 m²
6) Flush or staff beads10 m

Additional unit conversions for plaster dimensions (Clause 4.2):

  • Length & Breadth: from ft to m
  • Thickness: from in to mm

Summary:

  • Area measurements for plastering/pointing: use square meters (m²) in multiples of 10.
  • Length measurements for joints, beads, bands: use meters (m) in multiples of 10.
  • Thickness in plaster: use millimeters (mm).

This ensures consistency and aligns with the metric system recommended by IS 965.

?How are carriage of materials quantified in metric units according to IS 965?

According to IS 965 (1963), the carriage of materials in construction work is quantified by adopting equivalent metric units that closely relate to traditional fps units for ease of understanding and estimation.

Key Points on Carriage of Materials (Clause 2.83):

  • Materials like lime, moorum, building rubbish, earth, manure, sludge, excavated earth are quantified in cubic meters (m³).
  • Sand, stone aggregates, soling stone, bricks, tiles are also measured in cubic meters (m³).
  • Cement, stone blocks, steel sections, pipes (below 100 mm size), and other heavy materials are quantified in metric tonnes (t) or kilograms (kg) depending on weight.
  • Tar, bitumen, etc., are measured in liters (L) or cubic meters (m³).

Summary Table:

Material TypeMetric Unit
Earth, manure, sludge, excavated earthCubic meters (m³)
Sand, stone aggregates, bricks, tilesCubic meters (m³)
Cement, stone blocks, steel sectionsTonnes (t) / Kilograms (kg)
Tar, bitumenLiters (L) / Cubic meters (m³)

Notes:

  • The metric units are chosen for simple conversion and easy conceptualization.
  • Appendix A of IS 965 provides basic metric units for length, area, volume, and weight for reference.

This standardization facilitates uniformity in estimates and measurements across construction projects using metric units.

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?What guidance does the standard provide for converting weights and strengths of materials to metric units?

IS 965 Guidance on Conversion of Weights and Strengths to Metric Units

IS 965 provides detailed conversion factors from fps (foot-pound-second) units to metric units for weights, strengths, and related quantities in construction materials.

Key Conversion Factors (Clause 7, Table 7):

Quantityfps UnitMetric UnitConversion Factor (fps → metric)
Weighttontonne1.016
Weightcwt (hundredweight)quintal (q)0.508
Weightlbkg0.454
Weightoz (ounces)g28.350
Weight per unit lengthlb/ydkg/m0.496
Compressive & Tensile Strengthlb/in²kg/cm²0.070
Tensile Strengthtons/in²kg/mm²1.575
Stress (tensile, compressive)lb/in², tons/in²kg/cm², kg/mm²0.070, 1.575
Hydraulic pressure (head)ftm0.305
Moment of inertiain⁴cm⁴41.623
Section modulusin³cm³16.387

Additional Notes:

  • The standard emphasizes choosing metric units that maintain simple, direct relationships with traditional units for ease of understanding.
  • Appendix A of IS 965 lists basic metric units for length, area, volume, and weight.
  • For steel and iron work, weights in cwt convert to quintals (1 cwt = 0.508 quintal).

Example: Convert 500 lb/in² tensile strength to kg/cm²

[ 500 \times 0.070 = 35 \text{ kg/cm}^2 ]


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