Stairs by floor height · 11 ft 6 in · U-shaped, winders
U-shaped stairs with winders for an 11 ft 6 in floor height
20 risers of 6 7/8″ and 19 treads 11″ deep, at 32°. 36″ wide, it takes 6′ 3 7/8″ × 9′ 5 1/8″ of floor. Six winders carry it round the half turn, each taking a riser, so it needs no landing.
Open this stair in uCADWhat it’s made of
More or fewer steps
11 ft 6 in (138″) 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 |
|---|---|---|---|---|---|---|
| 18 | 7 11/16″ | 9 13/16″ | 38° | 13′ 11 5/16″ | treads under the IRC’s 10″ | open |
| 19 | 7 1/4″ | 10 1/4″ | 35° | 15′ 4 1/4″ | comfortable | open |
| 20 | 6 7/8″ | 11″ | 32° | 17′ 5 7/16″ | comfortable (drawn here) | open |
| 21 | 6 9/16″ | 11 13/16″ | 29° | 19′ 8 1/4″ | comfortable | open |
The IRC (US homes) allows risers up to 7¾″ and asks for treads of at least 10″, 6′8″ of headroom and a width of 36″; states and towns amend it. 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. 267 parts in all, every bolt and weld among them. Sizes in inches, length × width × thickness.
| Part | Qty | Length | Width | Thickness |
|---|---|---|---|---|
| stringer (shaped) | 1 | 135 11/16″ | 16 5/16″ | 1 15/16″ |
| stringer (shaped) | 1 | 121 1/16″ | 16 1/4″ | 1 15/16″ |
| stringer (shaped) | 1 | 81 3/16″ | 13 3/4″ | 1 15/16″ |
| stringer (shaped) | 1 | 91″ | 10 3/8″ | 1 15/16″ |
| tread (shaped) | 1 | 43 5/16″ | 21 9/16″ | 1 9/16″ |
| tread (shaped) | 1 | 48 3/4″ | 19 1/8″ | 1 9/16″ |
| tread (shaped) | 1 | 42 3/4″ | 21 11/16″ | 1 9/16″ |
| tread (shaped) | 1 | 43 11/16″ | 21 1/4″ | 1 9/16″ |
| tread (shaped) | 1 | 43 1/8″ | 21 3/8″ | 1 9/16″ |
| tread (shaped) | 1 | 48 11/16″ | 18 11/16″ | 1 9/16″ |
| stringer (shaped) | 1 | 77 1/2″ | 10 3/8″ | 1 15/16″ |
| post, timber 90x90 | 1 | 128 11/16″ | 3 9/16″ | 3 9/16″ |
| tread | 13 | 37 3/16″ | 12″ | 1 9/16″ |
| post, timber 90x90 | 1 | 85 13/16″ | 3 9/16″ | 3 9/16″ |
| post, timber 90x90 | 1 | 84″ | 3 9/16″ | 3 9/16″ |
| post, timber 90x90 | 1 | 68 1/2″ | 3 9/16″ | 3 9/16″ |
| post, timber 90x90 | 1 | 54″ | 3 9/16″ | 3 9/16″ |
| post, timber 90x90 | 1 | 46 7/8″ | 3 9/16″ | 3 9/16″ |
| handrail, round 50 mm (shaped) | 1 | 86 7/16″ | 1 15/16″ | 1 15/16″ |
| handrail, round 50 mm (shaped) | 1 | 73 3/8″ | 1 15/16″ | 1 15/16″ |
| baluster, steel square bar 18 mm (shaped) | 26 | 33 3/8″ | 11/16″ | 11/16″ |
Fixings: 26 × stud M8x80, glued, 26 × screw 5x45, 5 × bracket, concealed post base 90, 12 × anchor bolt M10x100, 54 × washer M10, 38 × nut M10, 10 × stud M10x117, 2 × anchor bolt M10x200, 2 × bracket, steel angle 100x100x8, 2 × stud M10x85, 16 × bolt M10x170, 16 × 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 11 ft 6 in in a 7 × 10 ft stairwell”, and it draws one that fits.
Same height: Straight · L-shaped, landing · L-shaped, winders · U-shaped, landing · Spiral · Square spiral
This stair for 11 ft 3 in · 11 ft 9 in · all heights