Hello, today In this article we are going to discuss footing depth for 1, 2, 3, 4, and 5-storey buildings. We build our buildings or any type of house with a lot of desires, and emotions. So, we must think about each step carefully. The footing of a building is like the soles of a human, and we all know how important it is. We will learn here, what should be the depth of footing for 1,2, 3, 4 and 5 storey buildings.
What is footing?
Footing is the first step in the construction of any building. First earth is excavated then lay the foundation for the new building with the help of concrete, steel bars, bricks, etc is known as footing. The footing is a risky part of the construction work because it handles the weight of the complete buildings.
What is Foundation?
Foundation is the part, connected to the footing which sends the load of the building to the ground via footing. It helps the building to stand strong.
Depth of footing.
The depth of footing is a very important part of building construction. It is decides by several things. Like the soil’s capacity, how many columns has taken, The total load and other things. The minimum suggested depth for the footings is 12 inches.
Depth for the foundation.
The approx suggested depth for the foundation is 1-1.5 meters below the actual ground. It is based on many terms like types of soil and on the excavation’s layout and more, Foundation is the part below the plinth. Normally footing size is considered as (1.5 × 1.5)m to (2 × 2) m. Where the load would be 300KN/ floor & Secure bearing capacity would be 250KN/m2.
Depth for footing & foundation.
Depth for footing varies from 3 to 9 ft depending on the types of soil and the building’s floor. For the building having higher loads, the depth of footing shouldn’t be less than 3 feet. And also the bearing capacity of the soil should be strong. The depth & width of the foundation formed on the terms of Secure Bearing capacity (SBC).
If we know the type of soil and load on it we can find exactly the footing depth. But if we don’t know these things exactly we can only assume the depth of the footing.
Footings are basically made of concrete. But brick, stone, or wood also uses to make footings.
What is the bearing capacity of soil?
The bearing capacity of soil is the capacity to support the loads, Which applies to a building that stands outside the ground.
There are some points that should follow while building construction.
The building should make exactly straightforward that should be the first priority to avoid overturning while the building’s construction.
As loads of a building are much heavier and difficult to stand properly. Buildings need the plane surface to control the weight properly of the buildings. So the buildings should construct on the plane surface because buildings have to withstand earth pressure, water pressure, or others.
According to the practice result of the United Kingdom (England), the Depth of the foundation can be around 450 mm(0.45m) minimum. It is a safe depth position in a building construction to prevent damage.
Practical results for depth of foundation in the US.
The practical result of foundations according to the US says about the depth of the foundation should be 0.75 m (750mm) in low-type soil (clay). In medium-type soil, it can be 0.9m(900mm). Whereas the UK research says that the depth of foundation is 1m minimum for the risky areas. And at the site where the trees are present near the foundation then the foundation depth should be 3m (3000mm).
What should be the footing depth for 1,2,3,4 & 5 storey buildings?
As we know that there are many factors in the way of building construction. we have to take care of all the things but for every floor of a building the weights get increasing and the load goes to land via foundation & footing. Here we will know about the depth of footing for 1, 2, 3, 4, and 5 storey buildings.
Depth of footing for (G+0) 1st-floor building
For the 1st-floor buildings, according to the practical result of building construction the thickness of the wall should be 9 inches, and the depth of the footing should be 1m or 3.5 feet for the 1st-storey buildings. The footing depth of 1m suggests for the soil having a higher bearing capacity.
So the footing size considers as 1m × 1m × 1m for the 1st storey buildings. The materials uses for 1st storey building Fe500 of [email protected]″C/C and the concrete should use M20 grade and the column size should be 9″×9″.
Depth of footing for (G+1) 2nd Floor building
For the 2nd-floor buildings, according to the practical result of building construction the thickness of the wall should be 9 inches for 2nd-storey buildings and the depth of the footing should be 1.2m or 4 feet for 2nd-storey buildings. The footing depth of 1.2m suggests for the soil having a higher bearing capacity.
So the footing size considers as 1.2m × 1.2m × 1.2m for 2nd-storey buildings. The materials used for 2nd storey buildings is Fe500 of [email protected]″C/C and the concrete should be used of M20 grade and the column size should be 9″×12″.
Depth of footing for (G+2) 3rd-floor building
For the (G+2) floor buildings, according to the practical result of building construction the thickness of the wall should be around 9 inches and the depth of the footing should be 1.5m or 5 feet for 3-storey buildings. The footing depth of 1.5m suggests for the soil having a higher bearing capacity.
So the footing’ size is considered as 1.5m × 1.5m × 1.5m for 3-storey buildings. The materials used for 3rd storey buildings is Fe500 of [email protected]″C/C and the concrete should be used of M20 grade and the column size should be 12cm×12cm.
Depth of footing for (G+3) 4th-floor building.
For the (G+3) floor buildings, according to the practical result of building construction the thickness of the wall should be around 9 feet and the depth of the footing should be 1.8m or 6 feet for 4th storey buildings. The footing depth of 1.8m suggests for the soil having a higher bearing capacity.
So the footing’ size is considered as 1.8m × 1.8m × 1.8m for 4th-story buildings. The materials used for 4 storey building are Fe500 of [email protected]″C/C and the concrete should be used of M20 grade and the column size should be 12″×16″.
Depth of footing for (G+4) 5th-floor building
For the (G+4) floor buildings, according to the practical result of building construction. The thickness of the wall should be around 9 feet, And the depth of the footing should be 2m or 7 feet for 5 storey buildings. The footing depth of 2m suggests for the soil having a higher bearing capacity.
So the footing’ size is considered as 2m × 2m × 2m for 5th storey buildings. The materials used for 5 storey buildings is Fe500 of [email protected]″C/C and the concrete should be used of M20 grade and the column size should be 12″×18″.
Also, Read This:
Conclusion
In this article, we have discussed The depth of the foundation & footing for 1, 2, 3, 4, and 5 storey buildings. And also about the land and soil condition for the best site for construction action.