How many steps for a 96 inch (8 ft) rise?
A total rise of 96 inches (8 ft) works out to 13 risers of 7.38 inches each, with 12 treads if the top riser lands on the floor or deck. At 10-1/2 in per tread the stairs run 126.0 inches (10.5 ft) horizontally, the stringer cut line is 158.4 inches, and you need 3 stringers cut from 14 ft 2 × 12s for a 36 in wide stair. The stair sits at 37.3 degrees.
Stair options for a 96 inch rise
| Target riser | Risers | Actual riser | Treads | Total run | Stringer board |
|---|---|---|---|---|---|
| 7 in | 14 | 6.86 in | 13 | 136.5 in (11.4 ft) | 16 ft 2×12 |
| 7.25 in | 13 | 7.38 in | 12 | 126.0 in (10.5 ft) | 14 ft 2×12 |
| 7.5 in | 13 | 7.38 in | 12 | 126.0 in (10.5 ft) | 14 ft 2×12 |
| 7.75 in | 13 | 7.38 in | 12 | 126.0 in (10.5 ft) | 14 ft 2×12 |
With 10-1/2 in treads and the top riser landing on the upper floor. Every option here is within the residential code limit of 7-3/4 in per riser.
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Lumber for a 96 inch rise, 36 inches wide
- Stringers: 3 pressure-treated 2 × 12 × 14 ft. Cut one, test fit it, and trace the rest from it.
- Treads: 12 treads. For a deck, two 5/4 × 6 boards per tread (24 pieces at 36 in, or 6 boards of 12 ft); for interior stairs, 12 pre-cut 11-1/2 in oak or pine treads.
- Risers: 13 riser boards at 36 in if the stair is closed, cut from 1 × 8 (5 boards of 8 ft).
- Hardware: stringer hangers or a ledger at the top, a 2 × 4 cleat anchored to concrete at the bottom, and 3 in structural screws. Deck stairs also need a landing pad: see the concrete calculator.
- Handrail: required with four or more risers, so yes for this stair: about 14 ft of rail with posts every 4 to 6 ft.
Checking a 96 inch stair against code
The 7.38 inch riser is under the 7-3/4 in maximum, the 10-1/2 in tread meets the 10 in minimum, and twice the riser plus the tread comes to 25.3, inside the 24 to 25 comfort range. If you have room, 11 in treads make the stair noticeably easier to climb: the run grows to 11.0 ft and the stringer board becomes 16 ft. If the run of 10.5 ft is too long for the space, a landing with a turn is the usual answer; steeper risers past 7-3/4 in are not allowed in a house. Headroom must be at least 6 ft 8 in measured plumb from the tread nosings.
Common questions
How many steps do I need for a 96 inch rise?
13 risers of 7.38 inches each, giving 12 treads when the top riser lands on the floor. With 7-3/4 inch risers at the code maximum it is 13 risers.
How long should the stringers be for a 8 ft rise?
The cut line is 158.4 inches with 10-1/2 in treads, so buy 14 ft 2 × 12s. With 11 in treads the board is 16 ft. Three stringers for a 36 in stair, four for 48 in.
How much floor space does a 8 ft rise staircase take?
About 10.5 ft of horizontal run with 10-1/2 in treads, or 11.0 ft with 11 in treads, plus a landing of at least 36 in at the bottom.