Protection of below ground structures against water ingress. Code of practice

Protection of below ground structures against water ingress. Code of practice

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1   Scope

This British Standard gives recommendations and provides guidance on methods of dealing with and preventing the entry of water from external sources into structures that are partly or wholly below ground.
It covers the use of:
  1. a) waterproofing barrier materials applied to the structure;
  2. b) structurally integral watertight construction; and
  3. c) drained cavity construction.
It refers to the evaluation of groundwater conditions and consideration of harmful ground gases, risk assessment and how to manage these risks in below ground structures.
This British Standard includes guidance on the drainage outside the structure and recognizes the risk of water entering a structure through openings.

NOTE 1 Structures that are partly or wholly below ground can include occupied rooms, tunnels, plantrooms, car parks, residential or commercial spaces, and service ducts. These structures can consist of any combination of solid masonry, concrete and steel as the primary ground retaining structures. This British Standard is relevant to structures below buildings or that are fully underground and covered by buried roofs, podium decks, or tunnel roofs.

Structures are generally characterized as “deep” if they have more than one storey below ground level, or “shallow” if they have only a single storey below ground. This British Standard is applicable to both.

NOTE 2 The principles for achieving waterproof underground spaces in this standard are relevant to most forms of underground space. However, it is recognized that deep tunnels, rock caverns, mines, pipelines and some water containment structures might follow design principles that are different to the approach set out in this British Standard. In these types of structures, the acceptable levels of water ingress can be very different to those defined in this standard.

NOTE 3 Standards and guidance for the protection of buildings against flooding by means of property level flood resistance and resilience measures are given in BS 85500.