Open Tread Staircases
An “Open Tread” is a staircase with openings where there are normally risers. Open Tread Staircases are slightly more expensive than closed staircases as they take longer to manufacture, however they have a much more modern look to them.
Cut String Timber Staircases
A Cut String staircase is when the board that forms the side of the stair, is cut out level with each tread. This makes the edge of each board (tread) stick out past the side of the stair. With this type of stair the tread is visible from the side elevation.
Closed Riser Timber Staircases
A “Closed Riser” staircase contains boards between each stair tread meaning that the underside of the tread is not visible. This type of staircase is seen as the most popular and allows for full carpet coverage or even just a carpet runner.