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