Er.Roshan Kr. Chaudhary

Faculty of construction engineering

R.A.G.C, Thane

Stairs

Terminologies

1.Baluster:The vertical member fixed between

string and hand rail.

Terminologies

Balustrades-The combined frame work of

baluster and hand rails.

Flights : Unbroken series of steps between

landing.

Terminologies

Hand rail: it is inclined rail ,provided over the

stings.

Head Room: vertical distance between nosing of

one flight and bottom of flight above it.

Terminology

Landing : The horizontal Platform between 2

flights.

Terminologies

Newel post: Vertical member at the ends of the

flight.

Terminologies

Nosing : Projected part of the tread beyond the

Riser.

Terminologies

Pitch:

Terminologies

Riser: The vertical front member of a step.

Tread: The horizontal upper portion of the tread.

Winders: special type of steps which are used in

place of landing

FOR DESIGNING YOU MUST KNOW Pitch:25-40 degree

Standard size of tread and riser:

Type of building Tread Riser

Residential

building

25 16

Commercial

building

27 15-16

factories 18 25

Different types of stairs:

Straight flight stair

Dog legged stair

Quarter turn and half turn stair

Spiral stair

Circular stair

Bifurcated stair

Open newel stair

Geometrical stair

Straight flight stair

Dog legged stair

Flights run in opposite direction and there is no

space between the two flights in plan.

Quarter turn and half turn stair. Stair turning through 90 degree.

Spiral stair

A Type of circular stair with a vertical column in

centre.

Circular stair

Circular in plan , winders are used in instead of

landing.

Bifurcated stair

Quarter turn stair with two branches divided after

landing.

Open newel stair

Similar to dog legged stair but there is some gap

between two flights.

Geometrical stair

Similar to open stair but two flights are connected

by each other by means curved winders instead

of landing.