Transcript PowerPoint® Presentation Unit 63 Types of Stairways Basic Stairway Arrangements • Stairway Components Unit 63 — Types of Stairways Interior stairways lead to upper or lower levels within.

PowerPoint® Presentation
Unit 63
Types of Stairways
Basic Stairway Arrangements •
Stairway Components
Unit 63 — Types of Stairways
Interior stairways lead
to upper or lower levels
within a building.
Unit 63 — Types of Stairways
Exterior stairways lead
to entrances or decks.
Unit 63 — Types of Stairways
Stairway arrangements are
based on room design.
Unit 63 — Types of Stairways
Stairways may be enclosed
by walls or railings.
Unit 63 — Types of Stairways
A stairway is
composed of many
components. Main
stairways are
commonly outfitted
with balusters and
newel posts.
Unit 63 — Types of Stairways
A stringer provides
the main support for a
stairway. Treads and
risers are fastened to
the stringers.
Unit 63 — Types of Stairways
Four types of stringers
are cleated, dadoed,
cut-out, and housed.
Cleated or dadoed
stringers are used for
stairways to basements
and other uninhabited
areas of a building. Cutout or housed stringers
are usually used for
other stairways.
Unit 63 — Types of Stairways
The total rise of
a stairway is its
total height and
the total run is
its length. The
unit rise is the
riser height and
the unit run is
the tread depth.
Unit 63 — Types of Stairways
Preferred angles for
stairs fall between
30° and 35°.
Unit 63 — Types of Stairways
Riser height is calculated first,
followed by tread depth
calculations. In this example,
the total rise of the residential
stairway is 8′-11″ and the total
run is 12′-4 3/4″.
Unit 63 — Types of Stairways
Square gauges are
positioned on a framing
square to ensure
accurate tread and riser
measurements. In this
example for a
residential stairway, the
risers are 7 1/4″ high
and the treads are 10
1/2″ deep. The stairway
has seven treads and
eight risers.
Unit 63 — Types of Stairways
When dropping the stringer, all riser heights will be
equal when a finish floor is placed.
Unit 63 — Types of Stairways
Stringers must be securely fastened at the top and
bottom since the stringers carry the main load of the
stairway.