Thread: Stair stringer stock size

Hi All,

First time posting in this forum.

I'm looking at replacing my staircase and need some advice on stock size for the stringers. The total rise is 2620mm, run is 3250mm with 14 risers and 250mm going on the treads. Staircase is 900mm wide.

I've located tables that give sizes for different stringers depending on the stringer span, but it's not clear how the span is measured. Is it the horizontal run (so 3250mm) or the length of the stringer?

I'd appreciate any assistance you can provide.

Oh yeah, should have mentioned that I'm planning a closed stringer.

Common size for stringers is Ex 50x300 but sometimes a 38x300 is used.
Treads are normall ex 38mm material either 260 or 300 wide
risers are ex 25x200.
don't ask me the finished size - Just used to sell sawn Meranti to manufacturers.

The span is the length of the member from support to support.
regards inter