We use many different species of timber when constructing staircases. Some timbers that we comonly use include:Tasmanian Oak, Spotted Gum, Black Butt, American Oak, and Victorian Ash. The timber that we use for jobs is great quality and, if you treat your stair with care, the timber should last for a very long time. E.g. A timber floating stair with glass balustrade and stainless steel fixings.