The minimum depth for any foundation is 900 mm; however, depending on how near the tree is to the proposed addition, this depth might be substantially increased. The foundations are designed to be taken down to such a depth that they will not be damaged by tree roots. The deeper the better!
It is important to remember that the purpose of the foundation is to resist pressure from below as well as above. So, the deeper the better! But, you should also consider the soil conditions under the tree as well as its location in relation to other trees and buildings before setting your depths. For example, if there are stones under the tree located close to the surface, they should be included in your calculations about depth requirements.
Also, keep in mind that larger trees require stronger foundations than smaller ones. This is because their weight distributes over a greater area. The maximum recommended depth for most fruit trees is 1.5 m, but check with your local authority on specific requirements for where you live. They may have specific guidelines regarding tree height and distance from property boundaries etc.
Finally, check your local building regulations before you start work. Some countries require building permits for major structural changes to existing homes or buildings. Others require only minor modifications like adding rooms or replacing windows without lifting the whole house up off its foundations.
In conclusion, the deeper the better!
A realistic minimum depth of foundation should not be less than 50 cm to allow for removal of top soil and fluctuations in ground level. As a result, the ideal suggested depth of foundation is between 1.00 and 1.5 meters from the original ground level. The deeper the better as more stable temperatures and humidity are achieved this far down.
The decision on how deep to make foundations depends on several factors. If you plan to use the house as its own foundation, then the deeper the better. This will help prevent problems with dampness under the house when it rained recently or heavily before drying out again.
If you plan to have someone else build or repair the foundation, then they will need time to complete their work without having to start from scratch every time the ground shifts due to rain or other natural forces.
So generally, if you want a stable base for your house, go as deep as you can. However, if you need to save money or time, then just enough depth will do.
Now that we know how deep foundation should be, let's look at some examples.
A foundation that is only 30 cm deep will most likely become unstable over time due to swelling and shrinking of the ground underneath it. This means that you will need to replace the flooring every few years at least until the house is sold or demolished.
For a modest residential construction, the minimum depth of foundation is roughly 5 feet from ground level, or at least 1.50 times the width of the footing. Because of the possibility of frost action, the depth of footing is kept at a minimum of 1.50m below the surface in cold areas. Where freezing occurs, it is important for the soil to be frozen as hard as possible before any concrete is placed in order to avoid damage to the concrete when it is thawed by water from within the block after it has set.
The purpose of the foundation is to transfer load from the building to the earth and back again. The deeper the foundation, the more resistance there is to movement from an earthquake or similar event. So the depth required depends on how strong you want your house to be against such forces.
You should also ensure that the footing is wide enough to accommodate any floor joists that might pass through it. This will help to prevent any bending or breaking of these members under pressure from people walking across them.
The minimum depth of footings should be sufficient to allow for the installation of various types of anchors if needed. This would include metal anchors for tying down heavy objects like furniture that might be placed upon the foundation.
If the footing is not deep enough, then it is possible that some parts of the structure could fail under certain conditions.
A deep foundation is a foundation that is installed at a greater depth under the ground surface and transmits structural loads to the soil at depth. Such a foundation's depth to breadth ratio is frequently more than 4 to 5. Deep foundations are commonly used in areas where no other kind of foundation would be appropriate, such as on grade beams, large concrete slabs, or heavy timber.
There are two basic types of deep foundations: solid rock and hollow tubes. Hollow-tube deep foundations consist of an array of cylindrical tubes filled with dirt and buried deep under ground. The open ends of the tubes are then covered with stone or some other material. These foundations can only handle vertical forces; they cannot support horizontal loads such as those caused by floors. In addition, hollow-tube deep foundations are difficult to inspect for damage after they have been buried for several years. Solid-rock deep foundations are made of stacked stone or brick walls that are built down into the ground over time. They can support both vertical and horizontal loads and provide excellent visibility since their bottom surfaces are always visible.
The depth of a deep foundation depends on several factors including but not limited to the load it will have to bear and the climate in which it will be used. Generally, deep foundations should be at least as deep as the highest expected floor level plus 20%.
Shallow foundations are used when the good load-bearing soil is at a shallow depth. The foundation depth must fulfill the breakdown's safety criteria, such that once the load is applied, the whole structure settlement is within permissible limits. Shallow foundations are commonly used for light frame single family homes, two-story structures, and small apartment buildings.
Why use shallow foundations? Shallow foundations are less expensive than deep foundations and they do not require heavy equipment to be excavated. Also, shallow foundations can be placed over existing soil without disturbing it too much, which makes them ideal for developing land. On the other hand, shallow foundations have several limitations: they cannot handle large loads, they cannot be placed in hilly or rocky soil, and they cannot withstand earthquakes.
How are shallow foundations constructed? First, the area where the building will go is cleared of all vegetation and any existing structures. Then the foundation wall is poured into the hole, usually around the perimeter of the property first to give it time to set up before the center is filled. When the foundation wall is done, the hole is backfilled with suitable material such as gravel or dirt and some type of surface layer is placed on top of the backfill. This is called the base course.