Buildings foundation design report

The foundation design report contains a geotechnical and structural study of the foundation works, compiled based on the geotechnical analyses and measurements carried out, presented in the form of drawings, descriptions and, where appropriate, calculations.

It is recommended that geotechnical investigations, which are usually carried out by means of weight sounding tests, be conducted at the corners of the building as well as along the wall lines at intervals of a maximum of 10 meters. Soil samples are taken to verify the soil information obtained from these tests. The building-specific geotechnical analysis usually includes soil sampling and laboratory testing.

It is recommended to terrain model the entire plot. This has the advantage that when the wall line of the building is modified, it is not necessary to do the modelling again. If necessary, a tree inventory and map are drawn up, if existing trees should be preserved on the plot.

The map and section drawings show the geotechnical analyses and measurements made, as well as the buildings foundation design and levels. The maps are typically in the 1:200 (1:500) scale and sections are displayed in the 1:100 or 1:200 scale.

The narrative section must include, inter alia, the following;

  • the geotechnical investigations and measurements performed
  • ground elevation levels
  • ground conditions
  • description of the groundwater level
  • buildings planned
  • presentation of the results of any calculations of load capacity, settlement and sliding surface. Where needed, the calculations are to be annexed to the foundation design report.
  • designed foundations of the buildings
  • any work instructions/compaction instructions for the foundation methods chosen
  • highest allowed foundation levels at geotechnical analysis locations (foundation levels also shown in drawings)
  • allowable bearing capacity
  • any piling work instructions
  • instructions for excavation and any groundwater pumping, if the foundation levels are below the groundwater level
  • if the drainage level of the building is below the groundwater level, a more detailed groundwater management report must be prepared
  • base floor building method (whether the base floors are load-bearing or ground-supported) and any presentation of the boundary of the building methods on the geotechnical analysis map
  • establishment of pipelines and, where appropriate, the presentation of the need to support the water supply lines
  • drainage of the foundations, surface drainage and presentation of base floor drainage
  • subsoil and subbases of yards and covered areas
  • presentation of the soil reinforcement needs of yards. The design of yard’s soil reinforcement is usually a separate assignment and plan
  • frost protection instructions
  • consideration of radon in structures
  • signature, training and contact details of the person compiling the buildings foundation design report