Does any one know what the requirements for stringer size are?

I've not made my mind up whether to go for an open or closed stringer. So I'm after a few things.

I'm after the min throat (distance between the corner where the rise and run meet and the back of the stringer) for open stringers.

For closed stringers is the a minimum amount of material that has to be left when the tread and risers are routed out.

I'm looking at a U shaped stair top section is about a 3.1 span and bottom section 2.3m span.
is there specific sizes required for those spans. I'm looking at making the stringers out of pine.

Thanks for all your help.


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