Stairs winding (spiral)

Hole in the ceiling - minimal for stairs with a diameter of 150 cm
Hole round 160 cm,
Hole square 160x160 cm,
stairs height 247,0-299,0 cm (landing flush with the upper floor),
stairs height 247,0-322,0 cm (landing below the upper floor),
height the step: not regulated 19,0/23,0 cm
width of the step: usable 650 mm (between the column and the railing)
stair treatment: left or right

Hole in the ceiling - minimal for stairs with a diameter of 160 cm
Hole round 170 cm,
Hole square 170x170 cm,
stairs height 247,0-299,0 cm (landing flush with the upper floor),
stairs height 247,0-322,0 cm (landing below the upper floor),
height the step: not regulated 19,0/23,0 cm
width of the step: usable 700 mm (between the column and the railing)
stair treatment: left or right

Hole in the roof-minimum: Round 180 cm, Square 180x180 cm, height 280,0-308,0 c,m height step: fixed 20,0/22,0 cm, width utility 750 mm,

Hole in the roof-minimum: Round 190 cm, Square 190x190 cm, height 280,0-308,0 c,m height step: fixed 20,0/22,0 cm, width utility 800 mm,

Hole in the roof-minimum: Round 200 cm, Square 200x200 cm, height 280,0-308,0 c,m height step: fixed 20,0/22,0 cm, width utility 850 mm,

Hole in the roof-minimum: Round 210 cm, Square 210x210 cm, height 280,0-308,0 c,m height step: fixed 20,0/22,0 cm, width utility 900 mm,

Hole in the ceiling - minimum for stairs with a diameter of 110 cm
circle opening 120 cm,
square opening 120x120 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 450 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 120 cm
circle opening 130 cm,
square opening 130x130 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 500 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 130 cm
circle opening 140 cm,
square opening 140x140 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 550 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 140 cm
circle opening 150 cm,
square opening 150x150 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 600 mm (between the post and the balustrade),
stair treatment: left or right

Opening in the ceiling - minimum for stairs with a diameter of 150 cm
circle opening 160 cm,
square opening 160x160 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 650 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 160 cm
circle opening 170 cm,
square opening 170x170 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 700 mm (between the post and the balustrade),
stair treatment: left or right

Opening in the ceiling - minimum for stairs with a diameter of 170 cm
circle opening 180 cm,
square opening 180x180 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 750 mm (between the post and the balustrade),
stair treatment: left or right

Opening in the ceiling - minimum for stairs with a diameter of 180 cm
circle opening 190 cm,
square opening 190x190 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 800 mm (between the post and the balustrade),
stair treatment: left or right

Opening in the ceiling - minimum for stairs with a diameter of 190 cm
circle opening 200 cm,
square opening 200x200 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 850 mm (between the post and the balustrade),
stair treatment: left or right

Opening in the ceiling - minimum for stairs with a diameter of 200 cm
circle opening 210 cm,
square opening 210x210 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 900 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 110 cm
circle opening 120 cm,
square opening 120x120 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 450 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 120 cm
circle opening 130 cm,
square opening 130x130 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 500 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 130 cm
circle opening 140 cm,
square opening 140x140 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 550 mm (between the post and the balustrade),
stair treatment: left or right

Hole in the ceiling - minimum for stairs with a diameter of 140 cm
circle opening 150 cm,
square opening 150x150 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 600 mm (between the post and the balustrade),
stair treatment: left or right

Opening in the ceiling - minimum for stairs with a diameter of 150 cm
circle opening 160 cm,
square opening 160x160 cm,
height of the stairs 280.0-322.0 cm (platform flush with the upper floor),
height of the stairs 300.0-345.0 cm (platform below the upper floor),
fixed step height 20.0/23.0 cm,
usable step width 650 mm (between the post and the balustrade),
stair treatment: left or right