My house is antique and I would like the stairs rebuilt because they are too steep. I know the first thing to make the stringers is calculate the total rise. But my problem is the floor where the first stair on the first floor begins is about 1.25" lower than the floor directly under the landing of the second floor.
So, I can't just measure from the second floor to the floor beneath. Would I have to use a long level and run it from the floor at the first step to a point below the second floor landing, mark where it is level below the landing and then take that measurement from the level mark to the second floor landing?
I hope this makes sense, I am attaching a picture of the problem.