Cost Estimating for Masonry Wall of Huron County Ambulance Station

This document provides a complete guide on how to do a take-off of the 4” Concrete block wall found around the interior perimeter of the Garage Area of the building. It includes a detailed list of the quantity take-off, calculation, and dimensions of the garage. The document also provides a complete guide on measuring masonry and cost estimation for the wall of Huron County Ambulance Station. The subject of the document is Cost Estimating and the course code is not mentioned. The document type is QS/Quantity Sheet and the assignment type is not mentioned.

Introduction to Cost Estimating
Measuring Masonry
Name:
Student No.:
Huron County Ambulance Station
 Do a take-off of the 4” Concrete block wall found around the interior perimeter of the Garage Area of the
building. (Area encompassing Rooms 100)
Project
:
Element/Trade:
By: Reference:
Date: Other:
TAKE-OFF LIST
Take-offs are a most used components of any of construction project to determine the estimate cost. Takeoffs can
vary from simple when the building project is small to complex when the size is huge .It is also used to estimate the
construction cost. The cost estimation is determined takeoff is crafted, what the core components of a construction
takeoff are, and what some factors are you should consider when creating takeoff.
Below is a takeoff list of the Concrete block wall around the interior perimeter of the Garage Area of the building of Huron
County Ambulance Station.
QUANTITY TAKE-OFF
The quantity to consider includes;
1. Masonry Units
2. Mortar for Masonry
3. Horizontal Reinforcing
4. Scaffold
5. Miscellaneous Items Associated with Masonry Work
Masonry units
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They are manufactured from dry stiff concrete mixtures which are molded and compacted. The common size is
8 by 8by 16 inches .windows and doors are positioned to reduce cuttings .when the vertical layers of the wall
are separated by a vertical space they must be held together by mortar. Reinforcement helps the walls to carry
load and resist the forces acting it.
Mortar for Masonry
Mortar is a paste used in binding the bricks, blocks and stones in a building and also they are used in decoration
purposes. They include pitch, asphalt and cement
Horizontal Reinforcing
In the horizontal reinforcement the plint beam is used to tie the place between the wall and foundation and the ring is
tied on top to provide more strength
Scaffold
This is a temporary structure used to support materials to aid construction and also they are used to access heights and
areas that is hard to access.
Miscellaneous Items Associated with Masonry Work
These are items used in construction but they are used in small quantities that there costs are small compared to the
other and the amount involved is not included in the main account .They includes glass panels used in the window ,
nails ,clippers and some other tools.
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Fig 1.Ground floor plan
Calculation;
Dimensions of the garage;
Length of the garage = 50.50 ft
Width of the garage = 36.25 ft
Perimeter of the interior part of the garage= (50.50x 2) + (36.25x 2) = 101 +72.5 ft =173.5ft
Height of the garage = 14ft
Dimensions of the door =3ft by 7ft
Backfilling = Excavation – volume of all works inside the excavated pit.
Dimension of the brick used=9” by 3” by 4”
Volume of standard brick = 9/12 × 3/12× 4/12 =0.0625ft3
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1. Estimating number of bricks
To estimate the number of bricks to be used in the construction the following calculation are considered;
The surface area of the wall.
=Gross surface Area – openings surface area
The surface area of one brick using the standard measures plus ½ of the joint thickness on each side and divide by
the surface area of the brick.
Determine the number of rows and multiply the result above with it .Then add 3% as the ass a wastage.
2. To determine the quantity of mortar
To calculate out the quantity of mortar used the following equations must be considered;
Volume of mortar per brick = (t) (w) (L+H+t)
Where t = mortar thickness, w = brick width/depth, L = brick length, H = brick height.
After getting the volume of the mortar then multiply it by the total number of bricks in each row then times the
number of rows. Add 4% to cater for wastes.
The quantity of standard size bricks (9inx3inx 4in) following the condition that we are given to determine the
number of bricks used we follow the following procedure;
Wall is 14 ft. high, 36.25 ft. wide in the length.
Two opening ,door that measures 3ft by 7ft and window measures 3ft by 3ft.
Mortar joints are 0.2 thick. Allow for 3% brick waste
The net surface area of the garage
Left side of the garage = 14 x 36.25 = 507.5 ft2
Area of the opening = 3 x7 =21 ft2
Net area =507.5 -21 =486.5ft2
Right side =507.5 ft2
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Area of the opening = (3x7)2 + (4x8.5) =42 +34 =76 ft2
Area of the upper part of the garage = 50.50 x14 =707.00ft2
Area of the opening = 3 x7 =21ft2
Net area = 707 -21 =686.00 ft2
Lower side of the garage =707.00 ft2
Area of the opening = (12.25 x 14) 3 =514.5
Net area = 707.0 -514.5 =192.50ft2
Total area = (486.5 +76 +686.0 + 192.50)
=1441ft2
The surface area of one brick as positioned including the mortar joint.
Thickness of mortar = 0.2ft
= (0.25+0.2) x (0.33+0.2) = 0.2385 ft2
Number of bricks=1441/0.2385
=6041.93
Now of rows used = 1
=6041.93 x 1.3 where 3% is the wasted
= 7855 bricks
The surface area of the mortar used;
Let the percentage covered by the block on the surface of the wall be 92%
% area covered by the mortar + wastes =100-92 =08%
The surface area of the mortar used for the whole wall = Area of the wall x 8%
= 8/100 x L x w
= 0.08
CODE Description Check/Complete
01000 SITE CLERANCE complete
01001 Common dry complete
01002 backfill complete
01004 Pit run complete
02000 REINFORCEMENT STEEL Complete
02001 Horizontal ladder tie reinforcing in lineal feet Complete
03000 CONCRETE complete
03001 Concrete Blocks complete
03002 Cement complete
03003 Sand complete
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03004 Wearing surface complete
03005 Slope protection complete
03007 Scaffold Allowance complete
0500 Quad rail complete
09000 Miscellaneous items complete
Prjt: QS/QUANTITY SHEET Page:
By: Element/Trade: of
DIMENSIONS
Description No. Length Width Height/Depth Conversion Quantity UO
M
FORWARD FROM PAGE:
1 Number of blocks required 6251.57 1.3 8127 EA
2 4” Blocks 2 36.25 14.00 1.125 1141.88 EA
3 Add 2 50.50 1400 1.125 1590.95 EA
4 Deduct door 4 3.00 7.00 1.125 94.50 EA
5 Duct opening in room 117 1 4.00 8.500 1.125 38.25 EA
6 Deduct total openings 3 12.25 14.00 1.125 578.81
7
8 Mortar for blocks 2 36.25 14.00 0.08 81.20 CF
9 Add 2 50.50 14.00 0.08 113.12 CF
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