U-shaped winder stairs (switchback, half turn staircase 180°) on stringers — Construction calculators online

U-shaped winder stairs (switchback, half turn staircase 180°) on stringers

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Calculation results

Staircase dimensions
  • Pitch (Angle): 32.01 °
  • Rise: 16.67 mm
  • stepWidth: 34.17 mm
  • Going: 26.67 mm
  • Number of Steps: 17 pcs.
  • Stairs Width: 100 mm
  • Minimum Stringer Throat depth (width): 15.87 mm
Bottom Stringers of Winder Steps Block
  • fractureNorm: 23.97 mm
Upper Stringer of Winder Steps Block
  • fractureNorm: 21.49 mm
Middle stringer
  • fractureNorm: 21.49 mm

Materials for construction

Bottom Stringers (straight flight)
  • Maximum Width: 30 mm
  • Stringer Length: 155.11 mm
  • Thickness: 6 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.056 m3
Bottom Winder Stringer (lower)
  • Width: 40 mm
  • Length: 112.11 mm
  • Thickness: 6 mm
  • Quantity: 1 pcs.
  • Wood Volume: 0.027 m3
Middle stringer
  • Width: 40 mm
  • Length: 216.06 mm
  • Thickness: 6 mm
  • Quantity: 1 pcs.
  • Wood Volume: 0.052 m3
Upper Winder Stringer (upper)
  • Width: 37.52 mm
  • Length: 110.76 mm
  • Thickness: 6 mm
  • Quantity: 1 pcs.
  • Wood Volume: 0.025 m3
Upper Stringers (straight flight)
  • Width: 30 mm
  • Length: 198.6 mm
  • Thickness: 6 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.071 m3
Bottom Winder Step
  • Width: 66.2 mm
  • Length: 100 mm
  • Thickness: 4 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.013 m3
Middle Winder Step
  • Tread Depth: 68.78 mm
  • Tread Length: 139.03 mm
  • Tread Thickness: 4 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.019 m3
Upper Winder Step
  • Tread Depth: 56.68 mm
  • Tread Length: 119.73 mm
  • Thickness: 4 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.014 m3
Steps of Straight Flight
  • Tread Depth: 34.17 mm
  • Tread Length: 100 mm
  • Tread Thickness: 4 mm
  • Quantity: 11 pcs.
  • Wood Volume: 0.15 m3
Risers of Straight Flight
  • Width: 12.67 mm
  • Length: 100 mm
  • Thickness: 2.5 mm
  • Quantity: 10 pcs.
  • Wood Volume: 0.032 m3
Riser of Bottom Winder Step
  • Width: 12.67 mm
  • Length: 100 mm
  • Thickness: 2.5 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.006 m3
Riser of Middle Winder Step
  • Width: 12.67 mm
  • Length: 106.3 mm
  • Thickness: 2.5 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.007 m3
Riser of Upper Winder Step
  • Width: 12.67 mm
  • Length: 105.99 mm
  • Thickness: 2.5 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.007 m3
Balustrade
  • Handrail Width: 8 mm
  • Handrail Thickness: 4 mm
  • Baluster Length: 369.01 mm
  • Wood Volume: 0.012 m3
Balusters
  • Baluster Width: 5 mm
  • Length: 86.85 mm
  • Quantity: 11 pcs.
  • Wood Volume: 0.024 m3
Corner Newel Post (bottom turn)
  • Baluster Width: 8 mm
  • Length: 156.67 mm
  • Quantity: 1 pcs.
  • Wood Volume: 0.01 m3
Corner Newel Post (upper turn)
  • Baluster Width: 8 mm
  • Length: 106.67 mm
  • Quantity: 1 pcs.
  • Wood Volume: 0.007 m3
Supporting Posts
  • Width: 10 mm
  • Length: 859.33 mm
  • Wood Volume: 0.086 m3
Joists Supporting Stair Turn
  • Width (material): 15 mm
  • Length (material): 80 mm
  • Thickness: 5 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.012 m3
  • #1 Joist Width: 15 mm
  • #4 Joist Width: 15 mm

Initial parameters

Display
  • Units: cm mm
  • Color drawing: paint mm
Type of winder steps connection to Newel Post
  • Dado joint (notched post): 1 mm
  • Newel Post mounted on the surface of winder steps with a fastener (without notching): 0 mm
Flight
  • Total Rise: 300 mm
  • Total Run: 260 mm
  • Stair Width: 100 mm
Calculate Length of Stairwell Opening along:
  • Upper stair flight: 1 mm
  • Intermediate stair flight: 0 mm
  • Bottom stair flight: 0 mm
Steps of Straight Flights
  • Number of steps, bottom flight: 5 pcs.
  • Number of steps, Intermediate flight: 0 mm
  • Number of steps, upper flight: 6 pcs.
  • Thread Thickness: 4 mm
  • Nosing (Tread Overlap): 5 mm
Risers
  • Riser Thickness: 2.5 mm
Stringers of Straight Flight
  • Thickess: 6 mm
  • Width: 30 mm
Stringers of Winder Steps Block (turn part)
  • Thickess: 6 mm
  • Width: 40 mm
Joists Supporting Stair Turn
  • Thickness: 5 mm
  • Width: 15 mm
Supporting Posts
  • Post Width: 10 mm
Upper Floor Slab
  • Slab Thickness: 20 mm
Balustrade
  • Handrail Height: 90 mm
  • Baluster Width: 5 mm
  • Handrail Thickness: 4 mm
  • Handrail Width: 8 mm
Wall
  • Wall Thickness: 20 mm
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Specify sizes
Display
DU
cm
CL
color
Type of Stair
LF
RG
Type of winder steps connection to Newel Post
LOC
INT
Flight
Y
X
Z
Calculate Length of Stairwell Opening along:
FTP
FMD
FBT
Steps of Straight Flights
QB
5
QM
0
QT
6
SW
SF
SP
Risers
H
HT
Stringers of Straight Flight
T
WI
Stringers of Winder Steps Block (turn part)
IT
IW
Joists Supporting Stair Turn
JT
JW
Supporting Posts
SB
Upper Floor Slab
ST
Balustrade
RH
BA
RT
RW
Wall
WT