A durable garden staircase consists of a concrete foundation, tread and riser. It is recommended to excavate the ground to a depth of around 80 centimeters and compact it, then create a foundation made of any material such as brick, concrete or paving and fill it with gravel. The stable foundation is very important for the stability and durability of the outdoor stairs. Stepping slabs made of sandstone, slate or other stoneware can be laid on top and fixed with mortar. Alternatively, concrete steps are cast using formwork and then covered with any other material.