Stair Stringer – the main structural stair element, diagonal boards supporting and Keeping the treads and risers, transfers hundreds to the construction. Bare minimum stringer throat depth – stringer least width from the sting to the saw's tooth, it’s chargeable for the structural capability (don’t overcut stair stringer) Needless to https://stairfactory.co.uk/Products/staircase-with-a-wooden-stringer/