I have been laying hardwood flooring throughout the house and I am looking to do the stairs next. These stairs are newly built and currently just have 2x4's nailed across them with plywood risers. The videos and information I am finding all talks about redoing stairs that already have plywood treads and risers on it so I am not sure how to approach this. I have purchased 1" treads and matching hardwood risers.

Do I just pull out the 2x4's and put the treads directly on the stringers with only the sides supported then face nail them in?

Or should I pull the 2x4's out then nail on 1/2" plywood or something on the stringers then put the hardwood treads and risers on that?

I guess the main thing I am unsure of is whether the 1" treads will be supportive enough that they will feel good while walking on them. Here is a picture to hopefully better show what I am up against. Note that it's an older picture and drywall/painting etc is done now but the stairs are the same as they are in the picture.

Can anyone help? I am also wondering how to nail these. I assume I just face nail them?

Seems we lack stair builders here great-one.

I would pull the 2x4's and just placed the treads on the step supporting area. Glue and pin nail out of sight.

Heck, everything would have to come off, wouldn't it? The existing looks like 2 x lumber on the riser. Otherwise the final tread nosing would not come out far enough?

Any more pics?

Thanks for the reply. I will have to take a look tonight and see what that riser is. You may be right it might be too thick. From what I am reading the treads need to be at least 10" (9" + 1" nosing). The risers should be no taller then 7 3/4 with a variation no more then 3/8 throughout. I will measure tonight and see what I am up against. The treads I bought are pretty wide so I might just leave the existing risers there just to add some width to the steps and put the hardwood risers right on them with some liquid nails and nail them in.

I've been reading different places where they recommend using trim screws on the treads to give them more of a grip. Since I won't be able to glue them in place or anything being right on the stringers I think I might go this route. I need to go to the hardware store and see how big trim screws are to see how much bigger a hole they will need.