Originally Posted by mrgins
Calculate your total height from finished basement floor to finished first floor. I would place the stringers on top of the floor sheathing. Lumberyard material is already kiln dried enough for this project. The only adding/subtracting to be done is taking off the thickness of the tread from the bottom of the stringers, and adding it to the rise of the top of the stringers
Thanks for the quick response!
Finished basement floor would be measured from the top of the carpet pile?
The reason I hesitated to place the stringers on the AdvanTech is that it will be sitting on top of the dimpled membrane.
So, if I build the stair on top of the sheathing, I don't need to take into account the fact that the finished floor (carpet in this case) is sitting higher than the bottom of the stringer?