The railing system Ī spiral staircase with ornamental balusters. Scotia is concave moulding that is underneath the nosing between the riser and the tread above it. Today, special flexible, plastic trim is available for this purpose. Trimming a bullnose is a special challenge as the last riser above the lower floor is rounded. Shoe moulding may be used between the lower floor and the first riser. Within a flight of stairs there is no trim as the trim thickness will significantly eat into the tread width. quarter-round or baseboard trim) is normally applied where walls meet floors. There are typically two stringers, one on either side of the stairs though the treads may be supported many other ways. stringer, stringer board or sometimes just string - The structural member that supports the treads.When three steps are used to turn a 90° corner, the middle step is called a kite winder due to its similarity to a diamond-shaped kite.
A series of winders form a circular or spiral stairway. They are used to change the direction of the stairs without landings.
A double bullnose can be used when both sides of the stairs are open. The rounded portion of the step is called a "bullnose". bullnose - Where stairs are open on one or both sides, the first step above the lower floor may be wider than the other steps and rounded.If it is present, this means that horizontally, the total "run" length of the stairs is not simply the sum of the tread lengths, the treads actually overlap each other slightly nosing - An edge part of the tread that protrudes from the riser beneath.This may be missing for an "open" stair effect. riser - The vertical portion of the step between steps.The tread "length" is measured from the outer edge of the step to the vertical "riser" between steps.
It is constructed to the same specifications (thickness) as any other flooring. tread - The part of the step that is stepped on.The step is composed of the tread and riser. A straight stairway with tiled treads, a double railing and two landings.