All works must be measured using which of the following tolerances?
In the booking dimension, the order shall be in the following sequence of length, breadth, and height or depth or thickness.
All work shall be measure net subjected to the following tolerance unless otherwise stated.
Quantity | Degree of accuracy (nearest to) |
Dimension (length, breadth, depth) | 0.01 m. |
Area | 0.01 sq. m |
Volume | 0.01 cu.m |
Volume of wood | 0.001 cu.m |
Weight | 0.001 tonne |
The thickness of the RCC slab | 0.005 m |
Thickness of woodwork | 0.002 m |
The thickness of steelwork | 0.001 m |
The diameter of steel reinforcement bar | 0.0001 m |
Length of steel reinforcement bar | 0.005 m |
Using plinth area method, estimate the construction cost of a building having plinth area of 15 m 2 , if the plinth area rate is Rs. 2000/- per m 2 .
In the Plinth area method, the cost of construction is determined by multiplying the plinth area with the plinth area rate. The area is obtained by multiplying length and breadth (outer dimensions of the building).
Cost = Plinth area × Plinth area rate
Given: Plinth area = 15 Sqm and rate = Rs. 2000 Sqm
Cost of construction= 15 × 2000 = Rs. 30000/-
India’s #1 Learning Platform Start Complete Exam Preparation Daily Live MasterClasses Practice Question Bank Mock Tests & Quizzes Trusted by 6.1 Crore+ StudentsIn the case of preliminary estimate prepared per unit basis, the service units to be considered for a school and hospital are respectively ___________.
Service unit method:
The service units for various structures are given in the below table.
Sr. No. | Types of Construction | Service unit |
1 | School, College | Classroom |
2 | Hospitals | Bed |
3 | Hotel | Room |
4 | Hostel | Students |
5 | Theatre | Seat |
6 | Stadium | Seat |
7 | Jail | Kotani |
8 | Stable | Animal |
9 | water tank | Litre |
10 | Dam | Hectare meter |
11 | Water supply scheme | person |
12 | road | kilometer |
13 | Bridge | Meter |
14 | Power station | Kilowatt |
15 | Canal | Kilometer |
Types of estimates
1. Preliminary cost estimate
It is also called budget, approximate estimate. This type of estimate is prepared in the initial stage of a project.
2. Quantity estimate
Includes listing all the materials (items), required in order to complete the project. Cost is then calculated by multiplying the dimension of the plot/drawing by the rate of a particular item.
3. Revised estimate
When sanctioned estimate is exceeded by more than 5% either from rates being found insufficient due to change in price level or from any cause except important structural alterations.
4. Supplementary estimate
While a work in progress some additional works may be though necessary for development of a project which was not foreseen when the original estimate was framed, the estimate when prepared to cover all such works is known as supplementary estimate.
5. Complete estimate
An estimate of all the items which are related to the work in addition to the main contract or the detailed estimate.
6. Detailed Estimate (Item rate estimate)
A detailed estimate should have documents such as reports, specifications, drawings/plans, design charts and schedule of rates. It gives the most realistic cost of the project.
India’s #1 Learning Platform Start Complete Exam Preparation Daily Live MasterClasses Practice Question Bank Mock Tests & Quizzes Trusted by 6.1 Crore+ StudentsCubical Content Method:
Service Unit Method:
Plinth Area Rate Method:
Revised Estimate:
What is the quantity of cement (in kg) and of dry sand (in cubic meter) respectively required for preparing 1 cubic meter of wet cement mortar of 1 : 5 proportion?
The following is parameters and properties of cement:
1. Bulk density of cement = 1440 kg/m 3
2. Specific gravity of cement = 3.15
3. Weight of one bag of cement = 50 kg
4. Volume of cement bag = 50/1440 = 0.035 m 3
5. Number of cement bags in 1 m 3 = 30 approx.
6. Volume of dry mortar is 30% more than the volume of wet mortar.
∴ The volume of dry mortar = 1.3 × volume of wet mortar
Calculation:
1 m 3 of wet cement mortar will correspond to 1.30 m 3 of dry mortar
Sum of proportions = 1 + 5 = 6
1 m 3 of cement = 1440 kg
So, 0.216 m 3 to cement = 312 kg
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India’s #1 Learning Platform Start Complete Exam Preparation Daily Live MasterClasses Practice Question Bank Mock Tests & Quizzes Trusted by 6.1 Crore+ StudentsWhat is the lift of soil material for the canal shown in the figure?
Concept:
Lift of material:
Calculation:
The lift of soil material for the canal = \((1.50\ +\ 1.20) \over 2\) = 1.35 m
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India’s #1 Learning Platform Start Complete Exam Preparation Daily Live MasterClasses Practice Question Bank Mock Tests & Quizzes Trusted by 6.1 Crore+ StudentsExplanation:
The expected out-turn of a stone cutter for an item of work “ Ashlar stone dressing” is 0.70 cu m per day and for flag stone dressing, it is 1.5 cu m per day.
Out-turn of work per day per mason to some extent according to the nature, size, height, situation, location, etc. In bigger cities where specialized and experienced labour is available the out-turn is greater than small towns and country sides.
The following may be taken as the approximate quantity of work or out turn or task for an average artisan per day.
Sr. No.
Particulars of items
Quantity/day
Brick work in lime or cement mortar in foundation and plinth
Brick work in lime or cement mortar in superstructure
Brick work in mud mortar in foundation and plinth
Brick work in mud mortar in superstructure
Brick in cement or lime mortar in arches
Brick in cement or lime mortar in jack arches
Half brick wall in partition
Coursed rubble stone masonry in lime cement mortar including dressing
Random rubble stone masonry in lime or cement mortar
Ashlars masonry in lime or cement mortar
Stone arch work
Lime concrete in foundation or floor
Lime concrete in roof terracing
Lime concrete 1:2;4
12mm (1/2) plastering with cement or lime mortar
Pointing with cement or lime mortar
White washing or colour washing coats - 3 coats
White washing or colour washing coats - 1 coat
Painting or varnishing doors or windows one coat
Coal tarring or soligum painting one coat
Painting large surface one coat
Distempering one coat
Flag store floor laying with lime or cement mortar excluding LC
Brick on edge in floor lime or cement mortar excluding LC
Brick bat floor as in above
Timber framing sal or teak wood
Timber framing sal or country wood
Door and window shutters paneled or glazed
Door and window shutters paneled or battened
Sawing hard wood
Sawing soft wood
Single allahabad tiling or mangalore tiling
Double allahabad tiling
Breaking of brick ballest 40mm (11/2”) gauge
Breaking of brick ballest 25mm (1”) gauge
Breaking of stone ballest 40mm (11/2”) gauge
Breaking of stone ballest 25mm (1”) gauge
Ashlar stone dressing
Flag stone dressing
Earthwork in excavation in ordinary soil
Earthwork in excavation in hard soil
Excavation of soil
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India’s #1 Learning Platform Start Complete Exam Preparation Daily Live MasterClasses Practice Question Bank Mock Tests & Quizzes Trusted by 6.1 Crore+ StudentsAnswer:
The carpet area of residential building may be 50 % to 65 % of the plinth area of building with a target of 65 %.
Carpet area of building is the useful area or liveable area or lettable area. This is the total floor area minus the circulation area, verandahs, corridors, passages, staircase, lifts, entrance hall, etc. and minus other non-usable areas as sanitary accommodations (bath and W.Cs.), air conditioning room etc.
For office building carpet area is the useable area and for residential building carpet area is the liveable area and should exclude the kitchen, pantry, stores, and similar other room which are not used for living purposes.
The carpet area of a building for any storey shall be the floor area excluding the following:
(a) Sanitary accommodation, (b) verandahs, (c) corridors and passages, (d) kitchen and pantries, (e) stores in domestic buildings, (f) entrance hall and porches, (g) stair cases and mumties, (h) shafts for lifts, (i) barsaties, (j) garages, (k) canteens, (l) air conditioning ducts and air conditioning plant room.
The carpet area of an office building may be 60 % to 75 % of plinth area of the building with a target of 75 %.
The planners should aim to achieve a target to 75 % of the plinth area. The carpet area of residential building may be 50 % to 65 % of the plinth area of building with a target of 65 %.