Estimation of foundation movement and design of footing systems on reactive soils for the effects of trees

The paper details the method of designing for the effects of trees as set out in a new informative Appendix H in the revised Residential Slabs and Footings Standard, AS2870, published by Standards Australia in February 2011. Background to the recommendations is given along with an introduction into research efforts that may improve designs in the future. In essence, the recommendations have been formulated in the light of more than 20 years successful use in South Australia of simple rules promulgated by the Footings Group (South Australia). Other evidence, generally from case studies of damaged houses, has been gathered in different climates, which supports the general premises of the recommendations and the extrapolation of the method to areas with wetter climates.