2 Different Types of Concrete Foundations

There are a variety of reasons to be interested in the different types of available concrete foundations. Knowing the differences between types of foundations can save you time and money, both in the short term and in the long term, as there are many advantages and disadvantages to the different types. Different types of concrete foundations can also fit better with what their owners prefer. What follows is a summary of the practical differences between the different types of concrete foundations.


T-shaped foundations are a very common concrete foundation. They are primarily seen in areas where the ground freezes because they are designed to resist damage from frozen ground. In t-shaped foundations, a flat section of footing is placed deep under the ground, parallel to the surface.

The foundation is then placed. The foundation is a slab that is parallel to the footing, but it is taller and thinner. The relationship between these two parts is how t-shaped foundations get their name, because the shape they create resembles an upside down letter T.

Immediately below the surface, t-shaped foundations have a layer of gravel. Above that, wire mesh is used to pour flat concrete. This section is bolted to the t-shaped construction. Overall, the effect is a highly stable foundation that is able to survive anything that is thrown at it, including frozen ground. T-shaped foundations resist frost by keeping their important parts buried deep below the point in the ground that actually freezes.

Slab on Grade

Slab on grade foundations are also used very widely, but generally they are only used in areas that do not get cold enough for the ground to freeze.

Slab on grade foundations also have a layer of gravel below them that provides drainage; however, even the single slab of concrete for which this kind of foundation is named is more complicated than it appears at first.

They are thicker at the edges than in the center. The thicker part of the foundation is connected to the thinner part by a gradual incline. In addition to this feature, slab-on-grade type foundations have a variety of features that increase their stability and strength. For one thing, the slab contains a wire mesh for increased durability. The slab is also reinforced by metal rods.

Slab-on-grade type foundations are used only in areas in which the ground does not freeze. It is possible to insulation them in such a way that they become resistant to frost and frozen ground. As a result of this, you will sometimes see slab on grade concrete foundations in areas with winters cold enough to result in the ground freezing.