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Building Regulations

Plain-language guides to Approved Document A (Structure). Each one has a 3D build you can play step by step, and the pages of the Approved Document it relies on, highlighted and explained.

Strip foundation: the finished build GUIDE 01

Strip foundation

Approved Document A · Foundations · Section 2E

A cavity wall for a two-storey house, built up from a concrete strip foundation in medium-shrinkage clay. It shows how deep and how wide the strip goes, how thick it must be, and how the two leaves, cavity and ties above it are set out. Getting the depth wrong on clay is one of the commonest causes of cracking in houses, so it is one of the first things building control checks on site.

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Coming next

  1. 02Cavity wall and ties
  2. 03Solid wall thickness
  3. 04When the simple rules apply
  4. 05Lateral restraint straps
  5. 06Openings and chases
  6. 07Masonry chimney
  7. 08Timber floors
  8. 09Steel beams and engineered design
  9. 10Re-covering a roof
  10. 11Robustness

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