Stair Design Guide
Original design - File:Stairs.fcstd
Stairway for SeedHome v2
The top of the 2nd story sub-flooring is 121.125" from the top of the sill. We then need to add 1.5" from the basement slab to the sill plus another 1/4" for the flooring, making the total rise from the slab to the top of the flooring 122.875"
The actual stairway rise will depend on the height of the stair landing:
If made with 2x6s plus 3/4" planks it will be 6.25", making the needed rise 116.625"
If made with 2x8s plus 3/4" planks it will be 8", making the needed rise 114.875
15 steps of 7-3/4" (the maximum allowed by code) is 116.25"
15 steps of 7-5/8" provides 114.375"
Steps are 42.125" wide, 11.25" deep
Stairs with 7 3/4" rise
File:Stairs detail.fcstd - Detailed design file - 7.75" rise
File:Stairs simple.fcstd - Simple object for merge
Stairs with a 7 5/8" rise
File:7 625 stairs detail.fcstd - Detailed design file - 7.625" rise
File:7 625 stairs simple.fcstd - Simple object for merge
File:7 625 stairs example.fcstd - First floor example