Online calculator for calculating monolithic concrete slab foundation

Information on the purpose of the calculator

Online calculator for monolithic concrete slab foundation is designed to calculate the dimensions, formwork, the number and diameter of reinforcement and the volume of concrete required for arranging this type of foundation for houses and other buildings. Before choosing the type of foundation, be sure to consult with experts whether this type is suitable for your conditions.

A slab foundation is a monolithic reinforced concrete foundation laid under the entire building area. It has the lowest ground pressure among other types. It is mainly used for light buildings, since with an increase in the load, the cost of this type of foundation increases significantly. With a small depth, on sufficiently heaving soils, it is possible to evenly raise and lower the slab, depending on the time of year.

Be sure to have good waterproofing on all sides. Insulation can be both sub-foundation and located in the floor screed, and most often extruded polystyrene foam is used for these purposes.

The main advantage of slab foundations is the relatively low cost and ease of construction, since, unlike strip foundations, there is no need to carry out a large amount of excavation. Usually it is enough to dig a pit 30-50 cm deep, at the bottom of which a sand cushion is placed, as well as, if necessary, geotextiles, waterproofing and a layer of insulation.

It is imperative to find out what characteristics the soil under the future foundation has, as this is the main decisive factor in choosing its type, size and other important characteristics.

The following is a complete list of the calculations performed, with a brief description of each item.

General information on the results of calculations

• Slab Perimeter
- The length of all sides of the foundation
• Slab foot area
- Equals the area of the required insulation and waterproofing between the slab and the soil.
• Side area
- Equal to the area of the insulation of all sides.
• Volume of concrete
- The volume of concrete required to pour the entire foundation with the given parameters. Since the volume of ordered concrete may differ slightly from the actual one, as well as due to compaction during pouring, it is necessary to order with a 10% margin.
• Concrete weight
- The approximate weight of concrete is indicated by average density.
• Soil load from foundation
- Distributed load over the entire support area.
• minimum diameter of reinforcing mesh bars
- The minimum diameter, taking into account the relative content of reinforcement from the sectional area of the slab.
• minimum diameter of vertical rebars
- Minimum diameter of vertical rebars .
• Grid cell size
- The average size of the cells of the mesh of the reinforcing cage.
• Reinforcement overlap
- When fastening segments of rods with an overlap.
• Total length of reinforcement
- The length of the entire reinforcement for knitting the frame, taking into account the overlap.
• Total weight of reinforcement
- Reinforcing cage weight.
• Form board thickness
- Estimated thickness of the formwork boards, for the given parameters of the foundation and for a given step of the supports.
• Number of formwork boards
- The amount of material for formwork of a given size.