Foundations are what your house or other structures are built upon. Subsidence, heaving or rotation of footing systems is primarily caused by poor founding soils that compact and compress under load or clay soils that swell and contract with changes in moisture content of the soil. Although some compaction, settlement and landslip occurs in Queensland the majority of soil movement effecting houses is caused by moisture related shrinkage or heaving. The propensity of a soil to shrink or heave due to its moisture content is primarily related to its clay content.
To find out more about footing failures and foundations click on the PDF's below.