A concrete foundation can refer to a variety of concrete items like, a slab, or a footing, or a pile cap, or a foundation wall. Since this is such a broad term, we’ve outline some of the common thicknesses applicable for a ‘concrete foundation’. Typically if reffering to a slab then the thickness is usually at a minimum 4″ to 6″ total. There are other elements that make up a concrete foundation, such as a foundation wall, grade beam, pile cap and more… so it really depends on what sort of concrete elements you are specifically asking about for thickness.
Foundation Walls
Firstly a concrete foundation wall varies in thickness according to the structural requirements of the building. Commonly 8” or 200mm or 10” / 250mm for a foundation wall, but in some cases, may be thicker. Foundation walls are vertical concrete foundation elements, and as the size of the building increases and structural requirements increase, thickness can increase accordingly.
Concrete Slabs
Concrete slabs, such as slabs on grade, are often 6” or 150mm at a minimum for structural purposes. Thicker concrete slabs will typically seen at subsequent levels above main floor, known as suspended slabs.
Grade Beams
Concrete grade beams are designed like beams, hence the name grade beam, so commonly are 8” / 200mm and thicker, such as 12” / 300mm. They are commonly much deeper than that in overall height. They are built like a beam would be built in the way that width is much less than height.
Pile Caps
Pile caps are also foundation items for concrete structures. A pile cap is like a cube, so the depth is the main consideration here, commonly up to a 2 feet thick. They can be even larger/deeper, or smaller and this depends on the elevation of the pile below, as the pile cap must be embedded on top of the pile. Pile caps are essential components of buildings or structures with piles acting as support infrastructure for the superstructure.
Concrete Footings
Concrete footings are elements that sit under concrete foundation walls, supporting them. The thickness of concrete footings again, as they are rectangles, is really the depth. They can be 8” / 200mm and vary from there. It can really depend on the footing.
Most structural elements like grade beams, foundation walls, pile caps piles and footings can vary greatly in dimensional characteristics dependent upon the structure being supported. Typically slab-on-grade (SOG) construction is fairly consistently at a minimum of 150mm or 6”.
All in all concrete foundation elements vary greatly in size and thickness depending on the project, design, and determination of engineer, architect, or contractor.
For all your commercial or residential concrete foundation projects, call on the professional team from Deluxe Concrete Services. Their experts will help you in both ensuring you get a high quality outcome from your foundation pour, but also at an attractive price.
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