For an outdoor staircase it needs to be durable and able to stand-up to the elements. There are varied materials used from treated pine, hardwood and galvanised steel. The most common design would be an open rise staircase, which is a staircase without riser boards. The reason for this is so water cannot pool on the stair which could promote premature aging. No risers in a stair can also give a more open feeling. Care should be taken to fully coat the stair with a paint finish or related sealer to preserve and protect for many years to come.
GS7	GS8	GS9

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