- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 27 Apr 2018
Topsoil is the first, upper layer of soil, typically measuring between 5 - 20 cm (2 - 8 inches) deep. It can also be measured as the depth from the surface level to the subsoil, i.e. the distance to the first densely-packed layer of soil.
The topsoil is where the majority of the biological soil activity occurs, as it contains the highest concentration of organic matter and microorganisms, due to decomposition from animals, plants, and so on. The topsoil contains the highest concentration of plant roots, as plants acquire the majority of their nutrients from the topsoil layer.
The main elements that make up topsoil composition are:
- Organic matter.
- Mineral particles.
Water run-off results in minerals from the topsoil migrating down into the subsoil which can lead to mineral deficiencies in the topsoil. The knock-on effect of this is that roots have to dig deeper for nutrients. During construction it can be necessary to strip topsoil, although it should be considered that by exposing the subsoil, the rate of erosion of soil minerals increases.
 Related articles on Designing Buildings Wiki
Featured articles and news
Consistently one of our most popular articles - so just how much do you know about BoQ's?
Significant updates encourage whole building life cycle assessment and recognise products with Environmental Product Declarations.
Gustavo Giovannoni’s role in integrating modern planning requirements into historic town centres.
Desipite Hackitt's recommendations, the government are to consult on combustible cladding.
People or density - can we create urban liveability at ever-increasing densities?
3D printing is the computer-controlled sequential layering of materials to create 3D shapes.
Hackitt review calls for a radical rethink of the whole system and how it works.
Life cycle assessment is used to total up the environmental impact of a product’s supply chain. But why building LCA?
The government warns building owners of a performance issue with Grenfell fire doors.