1- Introduction
1- Introduction :
I will start with basic knowledge of concrete construction for the new bees. No worries, If you don’t even know what a construction site looks like, don't worry everybody starts somehow. Over the years you will learn them all.
In this book, we will calculate the volume of the concrete and the weight of the rebar will be placed.
First, we will start with old-school handwritten calculations then I will show you how to use excel spreadsheets to improve our speed.
Than I will show you the best software for concrete and rebar takeoff.
For now, All we need to know is rebar weights per foot for the sizes
in the table below.
|
Bar Size |
Weight (LBS/FT) |
|
#3 |
0.376 |
|
#4 |
0.668 |
|
#5 |
1.043 |
|
#6 |
1.502 |
|
#7 |
2.044 |
|
#8 |
2.067 |
|
#9 |
3.400 |
|
#10 |
4.303 |
|
#11 |
5.313 |
Table 1.1 Rebar Sizes and Weights
You don’t need to force yourself to remember them. You will
remember most of them after finishing a couple of takeoffs.
You just need basic math skills, addition, subtraction,
multiplication, and division. You don’t need to solve major math problems in
this book.
Timing is very important in Estimating. Usually, there is a
bid date and you have to finish your takeoff in that time frame. Especially in
public bids, there is a time set for bid opening. if you late, all your work
will be wasted. That’s why we start right away.
We start estimating in the order of the way how you built the building. The first excavator excavates, then frame and pour footings, then walls, then gravel base for the slab, then slab on grade, then structural slabs, then stairs, and so on…
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