Avoice Regs: UK building regulations, searchable and cited. Every answer carries the clause it comes from.

Technical booklet C

Site preparation and resistance to moisture

About Technical booklet C

Technical booklet C gives guidance on preparing a site and resisting moisture. It covers site investigation, unsuitable material and contaminants, and how floors, walls and roofs keep moisture out.

What it covers

  • Site investigation and unsuitable material
  • Radon and man-made contaminants
  • Subsoil drainage
  • Resistance of floors, walls and roofs to moisture