Stairs by floor height · 3.40 m · L-shaped, winders
L-shaped stairs with winders for a 3.40 m floor height
19 risers of 17.9 cm and 18 treads 27 cm deep, at 34°. 1.00 m wide, it takes 3.16 m × 2.89 m of floor. Three winders carry it round the corner, each taking a riser, so it needs no landing.
Open this stair in uCADWhat it’s made of
More or fewer steps
3.40 m (340 cm) can be climbed in fewer, higher steps or more, lower ones. Each opens in uCAD as this stair with that many risers.
| Risers | Each riser | Going | Pitch | Run of a straight flight | How it walks | In uCAD |
|---|---|---|---|---|---|---|
| 17 | 20 cm | 25 cm | 39° | 4.00 m | steeper, fewer steps | open |
| 18 | 18.9 cm | 25 cm | 37° | 4.25 m | steeper, fewer steps | open |
| 19 | 17.9 cm | 27 cm | 34° | 4.86 m | comfortable (drawn here) | open |
| 20 | 17 cm | 29 cm | 30° | 5.51 m | comfortable | open |
Limits differ by country: England’s Approved Document K allows a rise up to 220 mm and a pitch up to 42° in a home, Germany’s DIN 18065 up to 200 mm, and both ask for 2.0 m of headroom. Check the code that applies to yours.
What it’s made of
Drawn as it’s built, in timber with open treads: treads housed in the stringers, posts under the turns, a railing on its newels. 240 parts in all, every bolt and weld among them. Sizes in millimetres, length × width × thickness.
| Part | Qty | Length | Width | Thickness |
|---|---|---|---|---|
| stringer (shaped) | 1 | 3821 | 448 | 50 |
| stringer (shaped) | 1 | 3475 | 450 | 50 |
| tread (shaped) | 1 | 1180 | 582 | 40 |
| stringer (shaped) | 1 | 2598 | 263 | 50 |
| tread (shaped) | 1 | 1195 | 572 | 40 |
| tread (shaped) | 1 | 1346 | 507 | 40 |
| stringer (shaped) | 1 | 2263 | 263 | 50 |
| tread | 15 | 1030 | 295 | 40 |
| post, timber 90x90 | 1 | 2960 | 90 | 90 |
| post, timber 90x90 | 1 | 2018 | 90 | 90 |
| post, timber 90x90 | 1 | 1379 | 90 | 90 |
| handrail, round 50 mm (shaped) | 1 | 2472 | 49 | 49 |
| post, timber 90x90 | 1 | 1197 | 90 | 90 |
| handrail, round 50 mm (shaped) | 1 | 2148 | 49 | 49 |
| baluster, steel square bar 18 mm (shaped) | 28 | 847 | 18 | 18 |
Fixings: 4 × tie rod M10x1127, 45 × washer M10, 34 × nut M10, 28 × stud M8x80, glued, 28 × screw 5x45, 3 × bracket, concealed post base 90, 8 × anchor bolt M10x100, 6 × stud M10x117, 2 × anchor bolt M10x200, 2 × bracket, steel angle 100x100x8, 2 × stud M10x85, 11 × bolt M10x170, 11 × nut M10, barrel.
Closed risers, a steel frame, another width or railing: change it in uCAD, and the parts are worked out again, with a cut list of the boards to buy. Sizes of the structure are the library’s defaults for a house stair, not an engineer’s calculation for yours.
Another height or width
Will it fit your room?
Open it in uCAD, draw your walls round it and look: turn it the other way, move the turn up or down, change the width. Or tell the AI: “a stair for 3.40 m in a 2 × 3 m stairwell”, and it draws one that fits.
Same height: Straight · L-shaped, landing · U-shaped, landing · U-shaped, winders · Spiral · Square spiral
This stair for 3.35 m · all heights