Tilt of low-rise buildings with particular reference to progressive foundation movement


Guidance is given on the assessment of the significance of the tilt of low-rise buildings caused by foundation movement, when no significant building distortion occurs. The amount of tolerable foundation movement is governed by: the building's purpose; ownership of the building; the building superstructure; the foundations; and the nature of the ground conditions. The consequences of ground movement can be classified into three categories: aesthetics; serviceability; and stability. Advice is given on the design of stiff raft foundations when constructing new buildings, and on issues relating to the tilting of existing buildings. Once tilt has been confirmed, the causes of ground movement must be established and ongoing tilt should be monitored when a tilt greater than 1/250 is present, to establish whether there is progressive ground movement. The need for remedial action can then be assessed. 10 refs.

Source: BRE Dig.

             Digest 475,2003,8pp


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