Staircases and steps are often essential for access to various areas of your deck or living space. A staircase should not only be aesthetically pleasing, but it is also critical to the safety of the structure. Easy passage is essential, so the riser heights are designed to allow easy access. Risers that are too steep or treads that are too small can make the staircase difficult to use as well as un-safe (especially when going down the steps). Pine and Meranti timber is generally used for internal staircases and durable hardwood timbers are used for external staircases.