Concrete is a strong and durable material, but it can crack if it is not properly supported. The thickness of concrete plays an important role in its ability to withstand weight and pressure. In general, concrete needs to be at least four inches thick in order to provide adequate support. However, the specific thickness will vary depending on the type of project. For example, driveways and sidewalks can usually be built with four-inch-thick concrete, while thicker slabs may be needed for parking garages and other structures that will bear heavier loads. In addition, the type of soil and climate conditions can also affect the thickness of concrete that is required. Soil that is sandy or rocky will require thicker concrete, while cold weather conditions can cause thinner concrete to crack. As a result, it is important to consult with a professional like Gresham Concrete Contractors before beginning any concrete project.