Brickwork calculation, Materials and labour requirement for brick work

Brickwork calculation, Materials and labour requirement for brick work

In this article, I have Explained that how to calculate the bricks, cement, sand and water. Nowadays, there are so many articles and youtube videos are available. Then, what is the purpose of this article?. What it will fulfill?

In this article, I am going to explain the method by using 3d images. you can learn the concept of materials consumption by how many percentage. So, you will never forget for lifetime. We can easily arrive the materials.

Types of brick masonry:

Stretcher bond

Header bond

   

English bond

Flemish bond

At present stretcher bond and header bond masonry are not in practice. English and Flemish bond structure are now built.

For easy illustration purpose, let us take Stretcher bond brick masonry to evaluate.

3d image of a typical stretcher bond brick masonry

3d image of a typical stretcher bond brick masonry

If you close look the above image, you can observe some data for upcoming quantity evaluation. From the above image, I have listed some important data.

• Length of the wall in x direction is 10’3’’
• Height of the wall in y direction is 9’11’’
• Thickness of the wall in z direction is 0’9’’
• Number of courses in x direction is 13 number
• Number of courses in y direction is 34 number
• Number of courses in z direction is 2 number
• Size of the brick is 9’’X 4.25’’X3’’
• Mortar thickness is ½’’ in all mortar joints.
• There are 3 types mortar joints. Namely Bed joints, Head joints, Stretcher Joints.
• Total volume of Masonry is 76.25 cff

3d image of single brick  with mortar

3d image of single brick  with mortar

3d image of single brick without mortar

3d image of single brick without mortar

From the above 2 images, what you learn? You can notice some. I have listed below.

• Size of brick is 9’’X 4.25’’X 3’’ and volume is 114.75 cubic inches.
• Size of brick with mortar is 9.5’’X 4.5’’X 3.5’’ and volume is 149.625 cubic inches
• Each brick having 6 faces (2 header,2 stretcher,2 bed)
• Out of 6 faces, only 3 faces are covered with mortar.(1 header, 1 stretcher, 1 bed)

Points to remember:

• Brick masonry is consist of Bricks and Cement  mortar. If we divide the total volume of masonry volume by 1 brick with mortar volume, we can arrive total number of bricks.
• If we deduct 1 single brick volume from 1 brick with mortar volume, we can arrive mortar volume for 1 brick. Then we can multiply with total no of bricks. Then we can achieve the total volume of mortar.
• We have already Total masonry volume (76.25 cft). Also we have volume of 1 brick with mortar (149.625 cubic inches).Also we have volume of 1 brick without mortar (114.75 cubic inches)

 Brick work Calculation:

131760/149.625= 880 nos

From the above image, we can achieve the brick numbers is 880 nos

34.875 X 880 + 17.76 cft

From the above image, we can arrive the wet mortar volume as 17.76 cft

Cement and sand :

Now, we have only wet volume. In order to convert it to dry volume, you need to multiply with a constant of 1.27. The question is why?.

You can understand the concept from following pictures.

wet volume + 27% = dry volume

Now, we can easily arrive the cement and sand quantities.

cement mortar ratio

Dry volume = 1.27 X 17.76= 22.56 cubic feet.

Sand is 5 part of total 6 part. So 5/6 * 22.56 = 18.80 cft

Cement is 1 part of total 6 part. So 1/6 * 22.56 = 3.76 cft.

                                                  ( 50 kg = 1.25 cft of cement) = 150.6 kg.

Materials Needed

sl.no	Description	Quantity for 76.25 cft
1	Brick	880 nos
2	Sand	18.86 cft
3	Cement	150.6 kg

 Labour needed:

To workout labour requirement some points must be considered.

• Labour task or out turn is not uniform. It depends upon various factors like labour skill, where the work site etc.
• All over the world, there are different types of anatomy.
• Even though, let us take Indian labour condition.

1 no means 1 labour work for 8 hrs in a day.

Sl.no	Description	Quantity for 76.25 cft
1	Mason 1st class	0.10
2	Mason 2nd class	1.5
3	Male Mazdoor	1.5
4	Female Mazdoor	1.5
5	Water man	0.43

What we learn:

There may be so many types of brick bonds, so many thickness of wall like 9’’ wall, 4.5’’ thick wall, half brick wall, full brick wall. First of all, analyse the structure and understand the concept. Then, take the volume for 1 brick with and without mortar. From that you can Evaluate the entire quantities.