Approved Document C
Site preparation and resistance to contaminants and moisture
About Approved Document C
Approved Document C gives guidance on preparing a site and protecting a building from harmful ground conditions and moisture. It covers contaminated land, radon and other gases from the ground, and how floors, walls and roofs resist damp and weather.
What it covers
- Clearing or treating unsuitable material on the site
- Resistance to contaminants, including radon and other gases from the ground
- Subsoil drainage
- Floors and their resistance to ground moisture
- Walls, including resistance to rain and condensation
- Roofs and resistance to weather
Approved Document C: site preparation and resistance to contaminants and moisture
Ministry of Housing, Communities and Local Government
Figures in the current edition
Diagram 1 Distribution of shrinkable clays and principal sulphate/sulphide bearing strata in England and Wales
Diagram 2 Example of a conceptual model for a site showing source–pathway–receptor
Diagram 3 Subsoil drain cut during excavation
Diagram 4 Ground supported floor – construction (see paragraph 4.7)
Diagram 5 Suspended timber floor – construction (see paragraph 4.14(a) (ii))
Diagram 6 Suspended floor – preventing water collection (see paragraph 4.14(a))
Related
Ministry of Housing, Communities and Local Government · Guidance
Ministry of Housing, Communities and Local Government · FAQ