U-Shaped Mono Stringer Metal Staircase with Double Winders Calculator

Two Quarter-Turn Steel Mono Stringer Staircase with Winders

U-shaped staircase - the best choice when the opening is very limited, a 180° turn allows you to almost halve the length of the staircase.

Winder steps - the most perspective type of turning, in terms of opening space saving.

This design allows installing a more steps per flight, compared to the variant with a landing.

The main weakness of the construction is the turning space - winder steps have different tread depths, which reduce from the outside to the inside. At the point of connection to the support post, the tread depth is minimal, causing problems when persons movement in opposite directions, and quite traumatic.

Compared to standard designs on two stringers, when building stairs on one central stringer (mono stringer) it is important to pay attention to the width and thickness of the bearing beam - frequently there are situations when the stringer begins to deform and sag.

U-shaped, 180° (Half Turn)
  • Straight
  • L-shaped, 90° (Quarter Turn)
  • U-shaped, 180° (Half Turn)
  • Spiral
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SVG vector drawings, 3D AR augmented reality
Display
DU
cm
  • mm
  • cm
  • m
  • inch
  • ft
CL
color
  • monochrome
  • color
Staircase Type
LF
RG
Staircase Dimensions, Stairwell
LB
LT
MD
Staircase Construction Mode
EX
EB
EM
ET
Staircase Dimensions, Stairwell
SH
SW
Steps
MW
MF
DH
SC
SF
SO
SP
Risers
HV
HT
Stringers
STH
STW
QT
3
  • 1
  • 2
  • 3
  • 4
  • 5
Upper Floor Slab
ST
Walls
WT
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SVG vector drawings, 3D AR augmented reality
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SVG vector drawings, 3D AR augmented reality
Distance: 0
Calculation results
Staircase Dimensions, Stairwell
  • Angle (Slope/Pitch): 33.12 °
  • Comfortable Staircase Formula (R + G): 44.7 cm
  • Blondel's Formula (2R + G): 62.35 cm
  • Rise (Step Height): 17.65 cm
  • Going: 27.06 cm
  • Number of Steps: 16 pcs.
  • Stairway Width: 100 cm
  • Correct a Going (Lower Stairway): 0 cm
  • Correct a Going (Middle Stairway): 0 cm
  • Correct a Going (Upper Stairway): 0 cm
Materials for construction
Step № 1
  • Length: 100 cm
  • Tread Depth: 31.69 cm
  • Thickness: 4 cm
  • Volume: 0.013 m3
Step № 2
  • Length: 100 cm
  • Tread Depth: 31.7 cm
  • Thickness: 4 cm
  • Volume: 0.013 m3
Step № 3
  • Length: 100 cm
  • Tread Depth: 39.35 cm
  • Thickness: 4 cm
  • Volume: 0.016 m3
Step № 4
  • Length: 109.04 cm
  • Tread Depth: 51.42 cm
  • Thickness: 4 cm
  • Volume: 0.022 m3
Step № 5
  • Length: 145.02 cm
  • Tread Depth: 57.23 cm
  • Thickness: 4 cm
  • Volume: 0.033 m3
Step № 6
  • Length: 151.42 cm
  • Tread Depth: 46.25 cm
  • Thickness: 4 cm
  • Volume: 0.028 m3
Step № 7
  • Length: 120.85 cm
  • Tread Depth: 45.49 cm
  • Thickness: 4 cm
  • Volume: 0.022 m3
Step № 8
  • Length: 105.21 cm
  • Tread Depth: 39.16 cm
  • Thickness: 4 cm
  • Volume: 0.016 m3
Step № 9
  • Length: 100 cm
  • Tread Depth: 39.64 cm
  • Thickness: 4 cm
  • Volume: 0.016 m3
Step № 10
  • Length: 109.94 cm
  • Tread Depth: 50.7 cm
  • Thickness: 4 cm
  • Volume: 0.022 m3
Step № 11
  • Length: 145.5 cm
  • Tread Depth: 56.05 cm
  • Thickness: 4 cm
  • Volume: 0.033 m3
Step № 12
  • Length: 151.42 cm
  • Tread Depth: 48.55 cm
  • Thickness: 4 cm
  • Volume: 0.029 m3
Step № 13
  • Length: 119.26 cm
  • Tread Depth: 47.72 cm
  • Thickness: 4 cm
  • Volume: 0.023 m3
Step № 14
  • Length: 103.99 cm
  • Tread Depth: 38.54 cm
  • Thickness: 4 cm
  • Volume: 0.016 m3
Step № 15
  • Length: 100 cm
  • Tread Depth: 32.66 cm
  • Thickness: 4 cm
  • Volume: 0.013 m3
Step № 16
  • Length: 100 cm
  • Tread Depth: 32.65 cm
  • Thickness: 4 cm
  • Volume: 0.013 m3
Riser № 1
  • Length: 100 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.002 m3
Riser № 2
  • Length: 100 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.002 m3
Riser № 3
  • Length: 100 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.002 m3
Riser № 4
  • Length: 101.44 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.002 m3
Riser № 5
  • Length: 114.84 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.003 m3
Riser № 6
  • Length: 141.42 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.003 m3
Riser № 7
  • Length: 115.37 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.003 m3
Riser № 8
  • Length: 101.71 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.002 m3
Riser № 9
  • Length: 100 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.002 m3
Riser № 10
  • Length: 101.71 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.002 m3
Riser № 11
  • Length: 115.38 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.003 m3
Riser № 12
  • Length: 141.42 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.003 m3
Riser № 13
  • Length: 113.78 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.003 m3
Riser № 14
  • Length: 100.97 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.002 m3
Riser № 15
  • Length: 100 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.002 m3
Riser № 16
  • Length: 100 cm
  • Width: 13.65 cm
  • Thickness: 1.8 cm
  • Volume: 0.002 m3
Initial parameters
Display
  • Units: cm
  • Color drawing: color
Staircase Type
  • Left Turn:  selected
Staircase Dimensions, Stairwell
  • Length (along Lower Stairway): 200 cm
  • Length (along Upper Stairway): 200 cm
  • Opening between Stairways: 80 cm
Staircase Construction Mode
  • Fixed Total Run:  selected
Staircase Dimensions, Stairwell
  • Total Rise: 300 cm
  • Stairway Width: 100 cm
Steps
  • Minimum Tread Depth at the Connection to the Support Post: 10 cm
  • Minimum Tread Depth at the Connection to the Stringer: 4 cm
  • Rise: 18 cm
  • Thickness: 4 cm
  • Tread Overhang (Nosing): 3 cm
  • Tread Overhang (Side): 3 cm
Risers
  • Thickness: 1.8 cm
Stringers
  • Tube Height: 6 cm
  • Tube Width: 4 cm
  • Quantity: 3 pcs.
Upper Floor Slab
  • Thickness: 20 cm
Walls
  • Thickness: 20 cm
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