Introduction to Pier Foundation:
In this type of foundation, the dry area is dug into a cylindrical hole of large diameter up to the desired depth. It is then installed by backfilling with concrete.
When the foundation of a building of heavy structure is located at a greater depth than the hard bed stratum for foundation and foundation in soft or sandy soil, the pier foundation is used to transmit the load to the strong stratum.
What Is Pier Foundation?
The Pier Foundation is a collection of various posts dug into the ground. Hence it is sometimes referred to as the “Post Foundation”. It is mainly installed at the intersection of the walls of the house. In a pier foundation, the vertical column is installed in a larger cross-section than the pile to the desired depth.
In this type of foundation, a deep shaft is made up to the hard bed and then filled with freshly mixed concrete with reinforcement. Thus, a rigid stratum of concrete piles is prepared.
Pier foundation is used in sites where it is difficult to dig up a traditional foundation as a strong foundation. And is done to protect the house from rising tides near the sea.
The difference between a cast-in-situ pile and a pier is related to their diameter. A cast-in-situ pile of more than 0.6 m in diameter is known as a pier.
How to Build a Pier Shed Foundation?
The idea of creating a foundation for your shed is always good. This prevents your building from coming into direct contact with the ground. Which prolongs the life of your shed. This article gives you a brief overview of how to create a Pier Shed Foundation.
Pier shed foundation can be a very effective option for your shed. For that, you should seek the help of a professional constructor. Which contractor is able to perform various tasks for your pier shed foundation.
For that, you need to determine the right number and location of pillars to suit your shade. Then, according to the location, the pillars have to be dug or drilled, and filled with concrete. Of particular importance is the addition of anchor bolts or galvanized post bases to the pier before concreting.
What Is a Concrete Pier Foundation?
A concrete pier foundation keeps your shed away from direct contact with the ground. A concrete pier foundation may be an excellent choice if water accumulates in your shed location area. This prevents moisture from coming into contact with the wooden floor of the shed. Since the concrete pier shed foundation extends about 2 feet above the ground, it helps to get a level for your shed.
Sometimes the ground is very soft so you should dig 6 inches deeper than the snow line to support the pillars. In addition, if the snow line is deep, you will need to go 6 inches deeper than the snow line for the pier of the shed.
The approximate concrete pier cost can range from 3 to $ 7 per square foot, depending on the size of your project, foundation depth, and type of foundation.
Pier Foundation Details
Pier Foundation Spacing
In the pier foundation, all piers are installed at the same level. The pier foundation is usually kept 1-1,5 feet above the ground. Which is necessary to prevent moisture coming from the ground into the floor of the house.
Pillars Shape & Size in the Pier Foundation
Pillars for pier foundation can be designed in different shapes.
A circular cross-section is usually used for the pier foundation of a house. The diameter of the pillars in the pier foundation can be made in 6 inches, 8 inches, 10 inches, 16 inches as required.
Materials Used in Pier Foundation
Building materials such as wood, brick, concrete, etc. can be used to make a pillar in a pier foundation. But reinforced concrete is used as the most suitable material for pier foundation. It is more resistant to compressive stress and high tension than other building materials.
Construction of Pier Foundation: Step by Step
Step:- 1. Planning for the Pier Foundation
Two factors play an important role in the planning of the Pier Foundation. First, the number of concrete posts will be determined by the size of your shed. Second, the diameter of the piles is determined according to the weight corresponding to the use of the shed.
If you want to use heavy items in your shed, you need more support, so the shed will need more than one pillar for a riding lawnmower.
The structure of the shed can also be an important factor for your shed. It determines how many pillars you will need, depending on the size of the joystick and its strength. If you want to limit the number of piles as the large joist of the shed can carry more weight in the long run, the size of the joist should be increased.
It is usually better to have more pillars for your shed than very few. More piles than your design may need is more support, but that’s not a bad thing for the stability of the shed. In fact, it can prevent the floor of your shed from bouncing and prevent damage to the structure. It gives you the strength to store more weight inside your shed in the future.
Step:- 2. Require for Drawing of Foundation Plan
Before you start digging for the pier foundation of your shed, you need to plan the foundation according to the needs of your shed. This plan will help you determine the number of piles and their locations for your pier shed foundation.
In general, the spacing between the pillars corresponding to your shed is determined by the dimensions of the beam and joist of the structure of the shed.
The amount of concrete you need for your shed pier foundation is calculated based on the size of the pier forms. A drawing plan is needed to determine what materials will be needed for your shed. The quantity varies depending on the size of your shed and pile, so it is useful for you to calculate the estimate of a particular project.
Step:- 3. Place and Soil Preparation
You don’t rush to start the pier foundation of your shed. Properly preparing your site for the Pier Shed Foundation is a multi-step process.
Check the permission rules:
Before you start any work for your concrete pier foundation, you will need a permit. Check the building permit rules with your local building authority.
Find the frost line:
You will need to determine the depth of the snow line for the shed pier foundation. Whose information is available with the local building authority.
Step:- 4. Mark the Pier Location
Connect the perimeter of the outline of the shed with the help of a string by placing a peg in each corner to mark the pier locations according to the drawing plan.
Then check regularly to make sure the squares are made from your string. Otherwise, the piers for your shed may end up in the wrong place. The location of the pillars inside the shed foundation is determined based on the perimeter of the outline.
Step:- 5. Dig Holes for Concrete Piers
There are two options for digging holes in piles for pier foundation. manual method and towable hydraulic oger method. Alternatively, a towable hydraulic auger increases the cost of your project. But it does help reduce the time and effort required for the entire project. The holes in your shed pier foundation are kept about 2 inches larger in diameter than your form tube.
Concrete form tubes usually serve as a form for concrete in pier foundations. Also commonly known as Sonotube. Concrete form tubes for form for concrete can be easily found in the market in standard sizes.
The sonotube is measured and cut about 6 inches above ground level. Which keeps the top surface of the concrete above the water as it is above ground level and keeps the wooden post dryer.
Step:- 6. Install Sonotubes
Once the sonotube has been cut to size as needed, place it in the holes, and check that it reaches the base of the gravel. Then after it reaches the desired depth in the ground, you need to make sure that the sonotube is properly vertical.
Layer each sonotube, making sure it is completely straight and level. You may need to adjust the holes a bit as you move forward, which gives you the ability to move the tube. After each sonotube is properly leveled, backfill the space around the tube.
Step:- 7. Mix and Pour Concrete
You can then start mixing the material to fill the concrete in the sonotube. Prepare by mixing the right amount of water in the right proportion. Start pouring this finished concrete slowly into the sonotube.
Once you have reached the top of the concrete form, place a 4 ”x 4” or 6 ”x6” galvanized plate on top of it before the concrete is set. Repeat the above process for each pier.
Step:- 8. Curing
If you moisten the concrete by curing your concrete pier for seven days, it will gain about 50 percent more strength than a pier without curing.
How Much Does a Pier Foundation Cost?
The Pier Foundation Cost usually depends on the size of your home and the number of pillars required. Typically can range from about $ 7,500 to $ 21,000.
Advanategs of Pier Foundation
- Pier foundation is a comprehensive excavation and can effectively use concrete. So, pier foundation cost saves money and time.
- We can use different materials for pier foundation and it also keeps your project on a low budget.
- This type of foundation causes minimal disruption to the soil environment. Because different holes are made for this type of foundation.
- This pier foundation method is simple and requires a small number of materials and labor.
- This type of foundation raises the house above the ground. So the structure is not damaged by water.
- This type of foundation provides space between the house and the ground. So it is useful to install plumbing and electrical wires.
- This type of foundation provides enough space for workers to solve problems for plumbing and electrical.
- Due to the large diameter of this type of foundation pier, observation is possible and engineers can change the design when needed.
Disadvanategs of Pier Foundation
- This type of foundation tends to get wet in the crawl space. Therefore necessary steps should be taken to drain any water from the crawl space.
- Crawl spaces in this type of foundation can be attractive for insects and other animals to live in. Screens have to be installed on the openings to control this problem.
- During the winter months, when cold air enters due to crawl space, the whole house will get cold.
- In earthquake-prone areas, houses can move from their foundations on foundation pillars.