Quote Originally Posted by basswood View Post
Hi,

IMO, using flooring for stair treads is not the best idea. It can create both practical and code issues. Solid, full-size treads work best and are less work.

Remember if you add 3/4" to all the treads, you have to also add 3/4" to the landing at the bottom or the first rise is taller than all the rest by 3/4"... the code max riser variation is 3/8"

http://www.stairways.org/pdf/2006%20...C%20SCREEN.pdf

Also you have to cut all the original nosings off, since max nosing thickness is 1-1/4", etc.

Plenty of considerations. Stair cases are not a good place to get it wrong... falls can be a killer.

All the best,

Basswood

http://basswoodcarpentry.com/
Bass, if he's adding flooring on the 2nd floor,treads,and first floor the riser hgt is still going to be the same hgt as it is before he starts. Look at it this way, if he was going to use 3/4 flooring and the hgt from floor to floor was 100" before he added it. He would still have 100" in finished hgt after he added the flooring on the 2nd floor and 1st floor.
He can add the same flooring on top of all the existing treads and still have the same rise as he did before he started.
The treads will be solid, Ive seen it done many times over the yrs.
How do we know the stairs arent a pre-made common set of box stairs whipped up in some factory. The stringer may be routed out for the treads and risers with wedges pinned in. It could be a bigger night mare if he's a diyer novice. He would need to start from scratch. Im sure just adding the flooring on the treads and building out the riser towards the nosing will be less of a head-ache for him.