Piled Foundation

Foundations that transfer loads from a structure through weak surface soils to deeper, more competent strata via long slender columns (piles) driven or bored into the ground. Mini-piles (80–300 mm diameter, bored by small rig) are often used in residential construction where access is restricted or where tree root barriers and shrinkable clay demand a deep foundation. More expensive than strip foundations but sometimes the only viable option.