4.4 Raft, pile, pier and beam foundations

Also see:

5.15.38.1

4.4.5 Services and drainage

Raft, pile, pier and beam foundations shall take account of new and existing services. Issues to be taken into account include:

  1. provision for new services
  2. adequate protection of existing services and drainage.

Provision for new services#

Where services are to pass through, above or under foundations, openings should be provided using suitable ducts, sleeves or lintels that:

  • are detailed so as not to impair structural stability
  • do not affect the ability of the foundation to carry loads
  • make suitable provision to allow for movement
  • have sufficient space to maintain line and gradient of drainage where movement occurs.

Existing services and drainage#

Existing services or drains should:

  • be supported and protected
  • be bridged, to prevent any load carrying
  • not be rigidly encased in concrete, masonry, etc.

Land drains should be diverted to a suitable outfall; other drains should be diverted or bridged.

Last updated: 2nd January 2024

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