What is a necessary consideration for the design of deck stairs in addition to slope?

In the design of deck stairs, drainage is a crucial consideration in addition to slope. Ensuring proper drainage helps to prevent water accumulation on the stairs, which can lead to safety hazards such as slipping or falling. Effective drainage also aids in prolonging the life of the materials used in construction, as excess moisture can cause rotting, warping, or other forms of deterioration over time.

While factors like color matching, material selection, and cost are important in the overall design and selection process, they do not directly impact the safety and functionality of the stairs concerning their ability to handle rain or other water exposure. Proper drainage systems, such as incorporating sloped surfaces or drainage channels, are essential for maintaining safe and durable stairs.