QUICK REFERENCE - METHODS OF MEASUREMENTS IN BUILDINGS

Here, we are giving you, the quick reference for methods of Measurement for some important items only. For Detailed methods for all items Refer Codes: IS 1200 & SP 27 in our previous blog.

Order of Taking Measurements:

Measurement in stages - a) Below ground/datum level.

                                           b) Above ground/datum level

• Earth work
• Foundations (Footings/Piles/Well foundation)
• Stone masonry
• Concrete works
• Form work
• Brick work
• Wood work and Joinery
• Steel works
• Hardware
• Glazing
• Floor finishes, Dado and Skirting
• Roof Covering
• Ceiling and Lining
• Plastering and Pointing
• White washing, colour washing, distempering and other finishes
• Painting, Polishing, varnishing
• Watersupply, Plumbing and drains
• Water and sewage lines
• Road works, pavements
• Boundary wall

STANDARD METHODS OF MEASUREMENT

1. EARTHWORK

• Dimensions shall be measured nearest 0.01m, where any dimension is above 25m -  nearest 0.1m
• Areas shall be to the nearest 0.01 m2
• Volume shall be to the nearest 0.01 m3

Classification: Materials to be excavated shall be classified as:

• Soft/Loose soil  |  Hard/Dense soil  |  Mud  |  Soft/Disintegrated Rock(SDR)  |  Hard Rock  |  

Types of Excavation : 

• Excavation including Rock cutting
• Surface Dressing : Trimming ground not exceeding 15cm deep) - measured in Sqm.
• Rough Excavation: Dressing not required - measured in Cum
• Surface Excavation - (Not exceeding 1.5 m in width, 10 Sqm. in plan & 30 cm in depth) - measured in Sqm.
• Excavation over areas (Above 1.5 m in width, 10 Sqm. in plan & 30 cm in depth) - measured in Cum
• Excavation in trenches (Below 1.5 m in width & not exceeding 10 Sqm area) - measured in Cum
• Post holes (Each not exceeding 0.5cum)
• Return, Fill and Ram - Measured in Cum
• Embankments : 10% deduction for solid contents, 5% incase machinery is used

Planking and Strutting

Lead and Lift : Lead - 50, 100, 150, 200, 250, 500, 1000, 1500m ; additional 500m upto 5km intervals, Lift - 1.5m intervals

Planking and strutting : In stages of 1.5m - measured in Sqm

Removing trees and Hedges : Trees not exceeding 30cm girth - measured in Sqm.

2. CONCRETE

RCC/PCC Cast in-situ : Classifications

• Foundation, footings, bases of Columns
• Walls
• Slabs supported on walls, beams, columns
• Chajjas
• Lintels, Shelves, Beams
• Staircase
• Balusters, newels, beams
• Arches
• Domes, Vaults
• .....Etc.

Measurements:

Columns : Top of Column base to underside of Ist floor & from top of floor slab to underside of 2nd floor slab

Beams : Length - Face to face of Column

               Depth - Bottom of slab to bottom of beam

               Depth of Inverted Beam - Top of slab to top of beam 

Chajjas : Inclusive of bearing (Without lintel) Clear with lintel/beam

Cavity walls : Plane along centre line of cavity

Channel : Rm

Tensioning strands : Kg (between anchorages)

Expansion joints : Rm

(Note : No deduction for volume occupied by reinforcements, openings upto 0.1 Sqm each)

3.BRICK WORK

Measurements : 

• Generally measured in Cum, unless otherwise stated
• Walls less than one brick thick - measured in Sqm, stating thickness
• Honeycomb work, cavity walls, broken glass coping, DPC, toothing and bonding -Sqm
• Brick edging, sills, cornices -Rm
• Greater than three brick thick - Actual measurement to nearest cm

NO Deductions for:

• Openings upto 0.1 Sqm
• Ends of dissimilar materials
• Bearings of slabs, chajjas where thickness is less than 10 cm and bearing does not extend to full thickness

4.FORM WORKS

• Measurements in Sqm 
• No deductions for openings upto 0.4 Sqm. No deduction shall be made for any opening/ cutouts when slipform technique is used.
• Secondary beams shall be measured upto the sides of main beams; No deductions in Main beam sides for intersection of secondary beams and no deductions in column casings at intersection of beams

5. WOODWORK AND JOINERY

Measurements :

• Length and width shall be to the nearest 0.01 Sqm
• Width of single plank shall be measured to the nearest 2mm and thickness also measured nearest 2mm
• Cubical contents shall be worked out to the nearest 0.001Cum

6. STEEL /ALUMINIUM, IRON WORKS /Roofing

Measurements :

• Weight of steel sections as per IS weights
• If weight not given, take @ 7850 kg/cum
• Weight to nearest Kg, length nearest 0.5cm
• Deductions - holes above 0.02 Sqm and Openings above 0.1 Sqm
• Authorized laps, cranks, chairs, spacers shall be measured extra
• Weight of Binding wire, weight of welds shall not be measured

Steel shutters/ Gates/ Windows

• Steel rolling shutters : Width- Inclusive of side guide channels and Height- distance between the Sill/FFL and the centre of the hood cover
• Collapsible gates : Height - FFL to top of Gate, width - out to out in open position
• Steel Doors/ windows/ ventilators: Height/ width - Out to out of frame to nearest 0.5 cm
• Pressed steel frames: Rm, Filling of frame width

Roof Covering: Measured net as fixed without any allowance for laps. Openings upto 0.4Sqm shall not be deducted. Portions of roof covering overlapped by ridge or hip shall be included. Circular openings shall be classified as holes

GI / Aluminium /FRP sheets - 2 corrugations for side lap

AC Sheets - 1/2 corrugation for side lap

Accessories in Rm

7. Floor Finishes - Measurements:

• Measured in Sqm, excluding expansion joints and Cum for thickness above 25cm
• No deduction upto 0.2Sqm openings

8. Plastering / Pointing :

• Measured in Sqm
• Thickness above 10mm done in separate layers and top coat is calles as floating / setting coat
• Minimum thickness at any point on the surface
• Length- Between walls/ partitions, Height from top of floor/ skirting/ dado to the ceiling
• Depth of moulds, cornices shall be deducted. Sides of plasters, projections added to wall plastering
• Deductions: No deductions for openings upto 0.5 Sqm. For openings above 0.5 Sqm but less than 3 Sqm - deduction for one face only. For openings above 3 Sqm, deduction on both sides and addition of plastering of jambs/ sill.
• Ceiling plastering - Measurement between walls, partitions (mouldings, cornices deducted)
• Beams - plastered sides of beams added to ceilings
• Pointing - Same as plastering
• V/ U Grooves measured in Rm

8. Colour washing, Distempering, Cement based painting / Painting

• On walls, ceiling measured separately
• Measurements will be that of plastered surfaces
• Corrugated surfaces measured flat and increased addl. qty. as follows. Corrugated steel sheets - 14%, asbestos sheets -20%, semi corrugated AC sheets - 10%
• Doors and windows of composite sections measured separately with application of appropriate coefficients.

Painting Coefficients

• Panelled / ledged joinery - 1.3 (Each side)
• Flush doors - 1.2 (Each side)
• Fully glazed/ gauzed : 0.8 (each side)
• Partly panelled / Glazed : 1.0 (Each side)
• Gates : 1.0 (All over)
• Steel rolling shutters : 1.10 (Each side)
• Plain steel sheet doors : 1.10 (Each side)
• Collapsible gate : 1.50 (All over)