Stairs by floor height · 11 ft 9 in · L-shaped, landing
L-shaped stairs with a landing for an 11 ft 9 in floor height
20 risers of 7 1/16″ and 19 treads 10 5/8″ deep, at 34°. 36″ wide, it takes 10′ 11 5/8″ × 10′ 11 5/8″ of floor. 10 risers up to the landing, 10 from it to the floor above.
Open this stair in uCADWhat it’s made of
More or fewer steps
11 ft 9 in (141″) 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 13/16″ | 9 13/16″ | 39° | 13′ 11 5/16″ | over the IRC’s 7¾″ riser | open |
| 19 | 7 7/16″ | 9 13/16″ | 37° | 14′ 9 3/16″ | treads under the IRC’s 10″ | open |
| 20 | 7 1/16″ | 10 5/8″ | 34° | 16′ 9 15/16″ | comfortable (drawn here) | open |
| 21 | 6 11/16″ | 11 7/16″ | 30° | 19′ 3/8″ | 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. 332 parts in all, every bolt and weld among them. Sizes in inches, length × width × thickness.
| Part | Qty | Length | Width | Thickness |
|---|---|---|---|---|
| landing (shaped) | 1 | 36 9/16″ | 36 9/16″ | 1 9/16″ |
| stringer (shaped) | 1 | 119 1/2″ | 10 3/8″ | 1 15/16″ |
| stringer (shaped) | 1 | 117 13/16″ | 10 3/8″ | 1 15/16″ |
| stringer (shaped) | 1 | 115 1/16″ | 10 3/8″ | 1 15/16″ |
| stringer (shaped) | 1 | 114 5/8″ | 10 3/8″ | 1 15/16″ |
| tread | 16 | 37 3/16″ | 11 5/8″ | 1 9/16″ |
| tread (shaped) | 2 | 37 3/16″ | 11 5/8″ | 1 9/16″ |
| post, timber 90x90 | 1 | 116 9/16″ | 3 9/16″ | 3 9/16″ |
| stringer | 1 | 32 5/8″ | 11″ | 1 15/16″ |
| stringer (shaped) | 1 | 32 5/8″ | 11″ | 1 15/16″ |
| post, timber 90x90 | 1 | 80 3/4″ | 3 9/16″ | 3 9/16″ |
| post, timber 90x90 | 2 | 71 7/8″ | 3 9/16″ | 3 9/16″ |
| handrail, round 50 mm (shaped) | 2 | 110 1/16″ | 1 15/16″ | 1 15/16″ |
| beam, timber 50x150 | 1 | 32 13/16″ | 5 7/8″ | 1 15/16″ |
| post, timber 90x90 | 1 | 54 5/16″ | 3 9/16″ | 3 9/16″ |
| beam, timber 50x150 | 1 | 32 1/4″ | 5 7/8″ | 1 15/16″ |
| post, timber 90x90 | 1 | 47 1/8″ | 3 9/16″ | 3 9/16″ |
| baluster, steel square bar 18 mm (shaped) | 34 | 33 3/8″ | 11/16″ | 11/16″ |
Fixings: 5 × tie rod M10x1041, 67 × washer M10, 48 × nut M10, 34 × stud M8x80, glued, 34 × screw 5x45, 5 × bracket, concealed post base 90, 12 × anchor bolt M10x100, 10 × stud M10x117, 2 × anchor bolt M10x200, 2 × bracket, steel angle 100x100x8, 2 × stud M10x85, 19 × bolt M10x170, 19 × nut M10, barrel, 4 × bracket, joist hanger 50x150.
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 9 in in a 7 × 10 ft stairwell”, and it draws one that fits.
Same height: Straight · L-shaped, winders · U-shaped, landing · U-shaped, winders · Spiral · Square spiral
This stair for 11 ft 6 in · 12 ft · all heights