Calculating Quantities for Bored Excavation and Bulk Excavation

This document provides a step-by-step guide on calculating quantities for bored excavation and bulk excavation in a construction project. It explains the formulas and calculations involved in determining the volume of piers and bulk excavation. The document also covers the number of SL72 reinforcing mesh sheets and lengths of SL12TM needed for the ground slab, as well as the structural steel required for the project.

Surname 1
Name
Course
Professor
Date
CPCCBC4004A: Assessment 2
This assessment involves taking off and measuring quantities of different materials from the
plans of the proposed cottage in Project 1. Each of the quantities measured and/or calculated are
recorded on P10 paper. The measured will help in prepared bill of quantities of the proposed
building project.
Assumption:
A 10% wastage is allowed on all quantities measured in this task.
1. Bored excavation for 300mm diameter piers
Piers’ diameter = 300 mm = 0.3 m
Piers’ radius = 0.15 m
Pier’s depth = 2.5 m
Volume of 1 pier = πr2H (where r = radius of pier and H = depth/height of pier).
= π x (0.15 m)2 x 2.5 m = 0.1767 m3
One pier is located at every corner or beam intersection and the rest are located at a maximum
spacing of 1800 mm. Based on this information and the ground floor’s structural detail, the total
number of piers is 53.
Hence total bored excavation volume for the piers = 53 x volume of 1 pier
= 53 x 0.1767 m3 = 9.37 m3
Item Particulars Unit Qnty Rate ($) Cost ($)
1 Bored excavation for 300 mm diameter piers m3 10
π/0.15/0.15/2.5/53 9.37
2. Bulk excavation for general site excavation
Bulk excavation in this task entails removal of vegetation on the site and top soil that does not
exceed a depth of 300 mm below the existing ground level (hence the depth of bulk excavation is
taken to be 300 mm). This excavation is intended for general site reparation before the
foundation and ground floor slab are laid. This bulk excavation does not include detailed

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excavation – excavation for slab beams. The bulk excavation extends 1 m beyond the house
walls to create adequate working space.
Volume of bulk excavation = length x width x depth
Bulk excavation of patio = (6.35m + 2m) x (1.67m + 1m) x 0.3 m
= 8.35m x 2.67m x 0.3 m = 6.69 m3
Bulk excavation of family room = (5.51m + 2m) x (4.08m + 1m) x 0.3 m
= 7.51m x 5.08m x 0.3 m = 11.45 m3
Bulk excavation of garage, kitchen, meals, foyer, laundry, dining, living, hallway and study
rooms = (12.83m + 2m) x (11.87m + 2m) x 0.3 m
= 14.83m x 13.87m x 0.3 m = 61.71 m3
Total volume of bulk excavation = 6.69m3 + 11.45m3 + 61.71m3 = 98.5m3
Item Particulars Unit Qnty Rate ($) Cost ($)
Bulk excavation excluding detailed excavation m3 80
8.35/2.67/0.3 6.69
7.51/5.08/0.3 11.45
14.83/13.87/0.3 61.71
79.85
Looking at the elevation and contours of the site for this project, a percentage of the bulk
excavated material will be needed to be used as fill material so as to achieve the desired level for
the building since the existing ground is not level. The contours of the site range from about
0.050 to about 0.300. Therefore approximately 50% of the bulk excavated material will be used
as fill material. 50% of 80 m3 that will be used as fill material is 40 m3.
3. N25 concrete to the ground slab
Ground slab
The depth of ground floor slab is 100mm = 0.1m
Volume of concrete to the family room = 5.51m x 4.08m x 0.1 m = 2.25 m3
Volume of N25 concrete to the garage, kitchen, meals, foyer, laundry, dining, living, hallway
and study rooms = 12.83m x 11.87m x 0.1 m = 15.23 m3
Total N25 concrete to ground slab = 2.25m3 + 15.23m3 = 17.48 m3
Allow 10% wastage = 17.48 m3 x 1.1 = 19.23 m3

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Beams
There are two categories of beams on the ground floor: edge beams (EB) and internal beams
(IB). The volume of N25 concrete to each of these beams is calculated as follows:
The concrete volume of a beam is calculated by multiplying the number of beam by the length,
width and depth of the beams. The depth of EB and IB is 420mm and 350mm respectively.
EB:
2 No. x 12.83m x 0.45m x 0.42m = 4.85 m3
1 No. x 10.82m x 0.45m x 0.42m = 2.04 m3
1 No. x 10.97m x 0.45m x 0.42m = 2.07 m3
Total N25 concrete to the EB = 4.85m3 + 2.04m3 + 2.07m3 = 8.96 m3
IB:
1 No. x 11.48m x 0.35m x 0.35m = 1.41 m3
1 No. x 4.61m x 0.45m x 0.35m = 0.73 m3
1 No. x 10.97m x 0.45m x 0.35m = 1.73 m3
Total N25 concrete to the IB = 1.41m3 + 0.73m3 + 1.73m3 = 3.87m3
Allow 10% wastage = 3.87m3 x 1.1 = 4.26m3
Patio slab
The thickness of the patio slab is 100mm
5.17m x 1.67m x 0.1m = 0.86m3
1.32m x 0.59m x 0.1m = 0.08m3
1.08m x 0.35m x 0.1m = 0.04m3
1.32m x 0.24m x 0.1m = 0.03m3
Total N25 concrete for patio slab = 0.86m3 + 0.08m3 + 0.04m3 + 0.03m3 = 1.01m3
Allow 10% wastage = 1.01m3 x 1.1 = 1.11m3
Pad footings
There are two identical pads and the depth of the pads is taken as 450mm.
2 No. x 1.2m x 0.9m x 0.45m = 0.97m3
Allow 10% wastage = 0.97m3 x 1.1 = 1.07m3

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Item Particulars Unit Qnty Rate ($) Cost ($)
N25 concrete to the ground slab m3 20
5.51/4.08/0.1 2.25
12.83/11.87/0.1 15.23
17.48
10% wastage
17.48/1.1 19.23
Beams m3 15
EB
2/12.83/0.45/0.42 4.85
1/10.82/0.45/0.42 2.04
1/10.97/0.45/0.42 2.07 8.96
IB
1/11.48/0.35/0.35 1.41
1/4.61/0.45/0.35 0.73
1/10.97/0.45/0.35 1.73 3.87
12.83
10% wastage
12.83/1.1 14.11
Patio slab m3 2
5.17/1.67/0.1 0.86
1.32/0.59/0.1 0.08
1.08/0.35/0.1 0.04
1.32/0.24/0.1 0.03
1.01
10% wastage
1.01/1.1 1.11
Pad footings m3 2
2/1.2/0.9/0.45 0.97
10% wastage
0.97/1.1 1.07
4. SL72 reinforcing mesh to the ground slabs
a) Net measure in m2
This involves calculating the net area of ground floor, including the floor area (slab) of the patio.
Net area of ground floor slab (garage, family, kitchen, meals, foyer, laundry, dining, living,
hallway and study rooms):
12.83m x 11.87m = 152.29m2

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5.51m x 4.08m = 22.48m2
Net area of patio slab:
6.35m x 1.67m = 10.60m2
Net measure = 52.29m2 + 22.48m2 + 10.60m2 = 185.37m2
Allow 10% wastage = 185.37m2 x 1.1 = 203.91m2
b) Number of SL72 reinforcing mesh sheets
The number of SL72 reinforcing mesh sheets required to complete the ground floor slab
(including patio slab) is calculated as follows:
Number of SL 72 reinforcingmesh sheets= Net area of ground floor
Effective cover of one sheet
The specification given is that the sheets available in the market measure 6.0m by 2.4m.
However, 2 bar overlaps are usually needed meaning that the effective cover of the sheets is
5.8m by 2.2m (allowing an overlap of 400mm). Therefore the number of SL72 reinforcing mesh
sheets required in this project for the ground floor slab are:
Net area of ground floor = 203.91m2
Effective cover of one SL72 reinforcing sheet = 5.8m x 2.2m = 12.76m2
Number of SL 72 reinforcingmesh sheets= 203.91m2
12.76 m2 =16 sheets
Item Particulars Unit Qnty Rate ($) Cost ($)
SL72 reinforcing mesh to the ground slab
Net measure of ground floor slab m2 204
Main ground floor slab m2 175
12.83/11.87 152.29
5.51/4.08 22.48
174.77
Patio slab m2 11
6.35/1.67 10.60
185.37
10% wastage
185.37/1.1 203.91
Number of SL72 reinforcing mesh sheets no 16
Effective cover area per sheet m2 13
5.8/2.2 12.76
Number of sheets

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204(13) 15.69
5. Lengths of SL12TM needed to the ground slab
The total length of the ground floor trenches includes both the external and internal trenches of
the proposed building. This length is determined by calculating the lengths of the trenches as
follows:
3 No x 12.83m = 38.49 m
3 No x 11.87m = 35.61m
1 No x 5.51m = 5.51m
2 No x 4.08m = 8.16m
2 No x 1.67m = 3.34m
1 No x 6.35m = 6.35m
Total length of trenches = 38.49m + 35.61m + 5.51m + 8.16m + 3.34m + 6.35m = 97.46m
Allow 10% wastage = 97.46m x 1.1 = 107.21 m
The trench mesh comes in 6m lengths. Therefore the number of trench mesh needed to the
ground floor is
Number of trench mesh= Total length of trenches
Length of one trench mesh
Number of trench mesh= 107.21 m
6 m =17.9 ≈ 18
Item Particulars Unit Qnty Rate
($)
Cost
($)
Lengths of SL12TM needed to the ground
floor
m 108
3/12.83 38.49
3/11.87 35.61
1/5.51 5.51
2/4.08 8.16
2/1.67 3.34
1/6.35 6.35
97.46
10% wastage

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97.46/1.1 107.21
Number of 6m lengths of SL12TM no 18
108(6) 18
6. Structural steel needed
Diameter of structural steel used = 12mm
Spacing of structural steel bars = 200 mm
There are two main types of structural steel bars used: main bars and distribution bars. These two
categories of bars have the same specifications (diameter and spacing).
Total length of bars = number of bars x length of one bar
Number of main bars= Width of slab
Spacing of steel bars +1
It is important to note that the structural steel measured in this project is for the ground floor
only.
A. Main bars
i) Main bars for family
Width = 4.08m, and length = 5.51m
Number of main bars= 4080 mm
200 mm +1=21.4 ≈ 22 bars
Total length of bars = 22 x 5.51m = 121.22m
ii) Main bars for garage, kitchen, meals, foyer, laundry, dining, living, hallway and study
rooms
Width = 11.87m, and length = 12.83m
Number of main bars= 11,870mm
200mm +1=60.35≈ 61 bars
Total length of bars = 61 x 12.83m = 782.63m
iii) Main bars for patio
Width = 6.35m, and length = 1.67m
Number of main bars= 6350 mm
200 mm +1=32.75 ≈33 bars

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Total length of bars = 33 x 1.67m = 55.11m
Total length of main bars = 121.22m + 782.63m + 55.11m = 958.96m
B. Distribution bars
i) Distribution bars for family
Width = 5.51m, and length = 4.08m
Number of distribution bars =5510 mm
200 mm +1=28.55 ≈ 29 bars
Total length of bars = 29 x 4.08m = 118.32m
ii) Distribution bars for garage, kitchen, meals, foyer, laundry, dining, living, hallway
and study rooms
Width = 12.83m, and length = 11.87m
Number of main bars= 12830mm
200mm +1=65.15≈ 66 bars
Total length of bars = 66 x 11.87m = 783.42m
iii) Distribution bars for patio
Width = 1.67m, and length = 6.35m
Number of main bars= 1670mm
200mm +1=9.35 ≈10 bars
Total length of bars = 10 x 6.35m = 63.5m
Total length of distribution bars = 118.32m + 783.42m + 63.5m = 965.24m
Total length of main and distribution bars = 958.96m + 965.24m = 1,924.2m
Allow 10% wastage = 1924.2m x 1.1 = 2,116.62m
Weight of steel reinforcement bars per meter = 0.89kg = 0.00089 tonnes
Thus total weight of the steel reinforcement to the ground floor is:
0.00089 tonnes/m x 2,116.62m = 1.88 tonnes
Item Particulars Unit Qnty Rate
($)
Cost
($)
Structural steel
Length of main bars m 959
Family room
22/5.51 121.22

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Other rooms
61/12.83 782.63
Patio
33/1.67 55.11
958.96
Length of distribution bars m 966
Family room
29/4.08 118.32
Other rooms
66/11.87 783.42
Patio
10/6.35 63.5
965.24
1,924.2
10% wastage
1924.2/1.1 2,116.62
Weight of main and distribution bars t 2
2116.62/0.00089 1.88
7. Plasterboard required
The plasterboard considered is the one that will be used on internal walls of the first floor rooms
only (including partitions but excluding wet areas).
Height of first floor walls (to the ceiling) = 2.45m
a) Net measure
Net measure = horizontal length of wall x height of wall
Bed 1: 15.88m x 2.45m = 38.91m2
Bed 2: 14.37m x 2.45m = 35.21m2
Bed 3: 12.5m x 2.45m = 30.63m2
Bed 4: 13.62m x 2.45m = 33.37m2
Rumpus: 12.31m x 2.45m = 30.16m2
Gallery: 6.06m x 2.45m = 14.85m2
Void: 4.75m x 2.45m = 11.64m2
Patio: 15.12m x (½ x 2.45m) = 15.12m x 1.225m = 18.52m2

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Hallway: 3.5m x 2.45m = 8.58m2
Total net area of wall for plasterboard = 38.91m2 + 35.21m2 + 30.63m2 + 33.37m2 + 30.16m2 +
14.85m2 + 11.64m2 + 18.52m2 + 8.58m2 = 221.87m2 ≈ 222 m2
It is assumed that the wastage factor trades off with the openings and other spaces that do not
require plasterboards such as windows and wet areas.
b) Number of plasterboard sheets
Number of plasterbaord sheets needed= Net areaof the walls
Areaof one sheet
The size of plasterboard sheets selected for this project is 2400mm long by 1200mm wide.
Area of one sheet of plasterboard = 2.4m x 1.2m = 2.88m2
Number of plasterbaord sheets needed= 222m2
2.88 m2 =77.08 ≈ 78 sheets
Item Particulars Unit Qnty Rate
($)
Cost
($)
Plasterboard
Net measure of internal walls and partitions m2 222
Bed 1
15.88/2.45 38.91
Bed 2
14.37/2.45 35.21
Bed 3
12.5/2.45 30.63
Bed 4
13.62/2.45 33.37
Rumpus
12.31/2.45 30.16
Gallery
6.06/2.45 14.85
Void
4.75/2.45 11.64
Patio
15.12/2.45/0.5 18.52
Hallway
3.5/2.45 8.58
221.87
Number of 2400x1200mm plasterboard no 78

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sheets
222(2.88) 77.08
8. 66 x 18mm finished DAR primed pine skirting needed for first floor rooms
The skirting is determined by the total length of the internal walls of all the first floor rooms
(excluding the wet areas such as bathrooms, ensuite and balcony).
Bed 1: 15.88m
Bed 2: 14.37m
Bed 3: 12.5m
Bed 4: 13.62m
Rumpus: 12.31m
Gallery: 6.06m
Void: 4.75m
Patio: 15.12m
Hallway: 3.5m
Total length of skirting = 15.88m + 14.37m + 12.5m + 13.62m + 12.31m + 6.06m + 4.75m +
15.21m + 3.5m = 98.2m
Allow 10% wastage = 98.2m x 1.1 = 108.02m
Assuming that the length of the chosen 66x18mm finished DAR primed pine skirting is 5.4m. It
means that the number of skirting pieces needed is:
Number of skirting pieces= 10 8. 0 2m
5.4 m =20 pieces
Item Particulars Unit Qnty Rate ($) Cost ($)
66 x 18mm finished DAR primed pine skirting
Length of skirting m 108
Bed 1
15.88/1 15.88
Bed 2
14.37/1 14.37
Bed 3
12.5/1 12.5
Bed 4

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13.62/1 13.62
Rumpus
12.31/1 12.31
Gallery
6.06/1 6.06
Void
4.75/1 4.75
Patio
15.12/1 15.12
Hallway
3.5/1 3.5
98.2
10% wastage
98.2/1.1 108.02
Number of 66x18mm 5.4m long DAR skirting no 20
108(5.4) 20
9. Ceramic floor tiles
The number of floor tiles is determined by the net floor area of each of the rooms where the floor
tiles will be installed.
a) Family room
Floor area = 4.08m x 5.03m = 20.52m2
b) Meals room
2.54m x 4.59m = 11.6m2
c) Kitchen
4.59m x 5.76m = 26.44m2
d) Foyer/stair area
Foyer: 5.4m x 1.71m = 9.23m2
Stair area: 2.09m x 3.16m = 6.60m2
Foyer/stair area = 9.23m2 + 6.60m2 = 15.83m2
Total area for floor tiles of the above rooms = 20.52m2 + 11.6m2 + 26.44m2 + 15.83m2 = 74.39m2
Allow 10% wastage = 74.39m2 x 1.1 = 81.83m2
Suggested floor tiles are square tiles measuring 60cm by 60cm.

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Area of one tile = 0.6m x 0.6m = 0.36m2
Number of floor tiles needed= Net floor area
¿(area¿) of one tile = 81.83 m2
0.36 m2 =227.3 ≈ 228 tiles
Item Particulars Unit Qnty Rate
($)
Cost
($)
Ceramic floor tiles
Net floor area m2 82
Family room
4.08/5.03 20.52
Meals room
2.54/4.59 11.60
Kitchen
4.59/5.76 26.44
Foyer/stair area
5.4/1.71 9.23
2.09/3.16 6.60
15.83
74.39
10% wastage
74.39/1.1 81.83
Number of 0.6mx0.6m floor tiles no 228
82(0.36) 227.3