competency: 305.02 design and draw stair systems objective: 305.02 identify the parts and standards...

Competency: 305.02

Design and Draw Stair Systems

Objective: 305.02

Identify the parts and standards used to construct a stair system.

Stair Systems Elements

Headroom Nosing Rise Riser Run

Total rise Total run Tread Stairwell

Stair Systems

Supporting structure Housed stringer Plain stringer Landing

Railing members Guardrail Handrail Balusters Newel

Stair Systems

TOTAL RUN

RISER

TREAD

GYPSUM BOARDFIRE RETARDANT

UNDER STAIRUSEABLE SPACE

STRINGERS

SOLID BLOCKING

AND STAIRFOR FLOORSUPPORT

IN BACK GROUNDLINE OF GUARD RAIL

KICKBLOCK

ABOVE NOSING38" MAXIMUM34" MINIMUMHANDRAIL

VERTICAL RAILS( TYP. 4" CLEAR MAX.)

FLOOR JOIST

INDIVIDUAL

RUN

(TYPE 'X') @ ALL

Stair Systems - Types

Straight run Most common No turns Require long open space

Stair Systems - Types

L stairs One landing with a turn Requires less space

Stair Systems - Types

Double-L stairs Two 900 turns, with two landings Not U-shaped Often used in residential construction

Stair Systems - Types

U stairs Two flights of parallel stairs Introduce landing midway the run Open or closed Types

Narrow U Wide U

Stair Systems - Types

Winder stairs Used in place of a landing Pie-shaped steps Mid-point width equals regular tread

width Least safe

Stair Systems - Types

Spiral stairs Rise in a circle about a point Decorative styles Requires little space

Stair Systems - Types

Circular stairs Trapezoid steps (treads) Irregular curve or arc Custom made Requires much space Expensive to build

Stair Systems

Main stairs Extend between main floors Assembled for high quality, prefabricated parts Provides focal point in two-story homes

Service stairs Frequent or heavy use Extend to basement or attic