Ground heave is a potential foundation design issue that can occur when moisture-sensitive soils expand and exert upward pressure on structures. This guide explains what causes ground heave, which ground conditions are most susceptible, and why it needs to be considered when designing foundations, reinforced concrete ground beams and pile caps.

Learn how ground movement can affect foundations and how compressible void formers and dedicated ground heave protection systems are used to help accommodate soil expansion. We explain how ground heave protection is installed beneath ground beams and pile caps to create a compressible zone between the concrete structure and the underlying ground. This space is designed to accommodate the anticipated upward movement of expansive soil, helping to reduce the transfer of heave pressure into the foundation.

The guide also looks at the factors that influence the required ground heave protection, including soil conditions, predicted ground movement, foundation design and structural loading. If you're planning a new build, extension or foundation project where ground heave may be a consideration, this guide provides a useful starting point for understanding the risks and selecting an appropriate protection system.