Stair Rail Parts Names

There are various components or parts of a staircase which have their own functions. Each components of a staircase and their details is discussed in this article.

Various Components or Parts of Staircase and their Details

Following are the various components of staircase:

Step

The step is composed of the tread and riser.

Tread

The part of the stairway that is stepped on. It is constructed to the same specifications (thickness) as any other flooring. The tread “depth” is measured from the outer edge of the step to the vertical “riser” between steps. The “width” is measured from one side to the other.

Riser

The vertical portion between each tread on the stair. This may be missing for an “open” stair effect.

Nosing

An edge part of the tread that protrudes over the riser beneath. If it is present, this means that, measured horizontally, the total “run” length of the stairs is not simply the sum of the tread lengths, as the treads actually overlap each other slightly.

Starting step or 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. The balusters typically form a semicircle around the circumference of the rounded portion and the handrail has a horizontal spiral called a “volute” that supports the top of the balusters.

Besides the cosmetic appeal, starting steps allow the balusters to form a wider, more stable base for the end of the handrail.

Handrails that simply end at a post at the foot of the stairs can be less sturdy, even with a thick post. A double bullnose can be used when both sides of the stairs are open.