Foundations - Basic Sizing

Basic Sizing ~ the size of a foundation is basically dependent on two factors

1. Load being transmitted, max 70 kN/m (dwellings up to 3 storeys).
2. Bearing capacity of subsoil under proposed foundation.

Bearing capacities for different types of subsoils may be obtained from tables such as those in BS 8004: Code of practice for foundations and BS 8103-1: Structural design of low rise buildings. Also, directly from soil investigation results.

The above widths may not provide adequate working space within the excavation and can be increased to give required space.