Stair Treads

mwj · Oct 21, 2024

I have a 42" wide staircase in my entry way. The stair contractor has one 2x12" stringer on each side with 5/8" OSB for the stair treads which will get 3/4" engineered oak treads glued and nailed on top of the OSB treads. There are 5/8" riser boards. Will the treads sag in the middle without a middle stringer?

C.J. · Oct 21, 2024

I don’t like that much. The 5/8” OSB by itself is worthless. 3/4” treads would be decent if you had a middle stringer. 3/4” + 5/8” = 1.375”, which itself would prolly span 42” adequately, but you don’t have 1.375”, you have two pieces that together add up to 1.375. It’s not the same thing. I guarantee you you’re gonna get a squiggles worth of adhesive and a few nails to hold the treads in place on the 5/8”. That’s not the same as if those 2 pieces of wood were fully glued together as one piece. I would want a middle stringer.

Tile Tom · Oct 24, 2024

I agree. I would want a middle stringer there as well

highup · Oct 26, 2024

36" and I think you'd be ok.
If the treads were a high quality 3/4" plywood you might be OK.
These stairs will be there for eternity.
36" probably fine, but I agree with the others. A middle stringer should have been installed.......
.....IF, the contractor knew this product was being installed.
Had he not known ......
....aw hell, what's the cost of an additional stringer on a $450,000 starter home. Just do it.

Stair Treads

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Stair Treads

Help Support Flooring Forum:

mwj

New Member

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C.J.

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Tile Tom

Professional

highup

Will work for food

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