The frost line in Maryland is 30 inches deep. The frost line is the depth in the ground that ground water will freeze. It is also referred to as the freezing depth or frost depth.Know More
A 30-inch frost line means that a building's foundations must be properly anchored at least 30 inches below ground. Because ground water freezes and swells, the foundation can be compromised if it is not installed at an adequate depth. To protect a building from damage, its foundation must be able to withstand the changing temperatures associated with Maryland's winters, as well as combat the high water table and frequent rainfall in the area.
The footings of the foundation are what supports the entire building. These must be constructed below the frost line, so the slope and elevation of the land must be considered. A stepped footing system takes those slopes into account and ensures that all the footings remain below the frost line. The type of soil is also an important factor in building a safe, well-established foundation. Some soils in the Maryland area are more susceptible to ice formation, making the frost line depth even more crucial in the footing, foundation and building process. Local building code guidelines should be referenced when constructing a new structure in Maryland.Learn more about The South
As of 2014, the frost line depth for the majority of North Carolina is 6 inches. The extreme southeastern coastline has no seasonally frozen ground. Frost lines are often referred to as frost depth or freezing depth.Full Answer >
The average depth of the frost line in Iowa is 58 inches. In the northern part of the state, the frost line can be up to 70 inches deep, while in the southern part the line may be less than 40 inches deep.Full Answer >
The frost line in Illinois is 40 inches, so the water in the soil has not been known to freeze deeper than that point. In Chicago, building codes require that concrete supports be poured at a depth of at least 3 feet 6 inches.Full Answer >
Cleveland's frost line is 42 inches, according to the city's building code. The frost line is measured to determine how deep footings must be for newly constructed buildings. Structures built too far above the frost line may suffer damage from frost heave.Full Answer >