Stair Design Guide

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Original design - File:Stairs.fcstd


Stairway for SeedHome v2

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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

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File:7 625 stairs example.fcstd - First floor example