High terrace walls are often mortared for better stability. Today, new walls are built for landscape conservation reasons of stone from local quarries. Wall depths and foundations are based on the planned height. Walls two metres high are - if not on bedrock - built on very large stones, or on a concrete foundation of 100 cm × 60  cm depth and height. An uphill oriented gradient to help stabilise the wall can be achieved by angled construction, or the stacking of stones that are repeatedly set back from the bottom upwards. The stones are set alternately 2 to 1 and 1 to 2 and each lies on at least 3 points of its surface. For one cubic metre of wall around two tons of stone has to be used.
