Thread: Stair stringers and tread thickness

Blocklayer, when I do stairs the floor becomes the top of the 1st tread and the top floor is the top of the last tread so when you divide the rise into the No of treads you get the rise to the top of each tread.

Don't take the thickness of the tread from the rise. It is part of the rise.

That's the way it is set up now Rat52, but I think he means that when you cut the stringer, you need to adjust the cuts down by the thickness of the tread, so when you place the treads on the tops of the stringer cuts, the top of the tread is at the correct height.
So, as he suggested, with a total rise of 3'3", you'd have 6 rises of 6 1/2". But, if the treads are 1" thick, the first cut in the stringer would need to be (vertically) at 5 1/2" so when the tread goes on it ends up at 6 1/2".
Is this what he means?

At the moment, you can choose from 'Concrete' and enter concrete thickness to give formwork dimensions, or 'Stringer Width' to give the actual stringer measurements. I was thinking about adding a 'Tread Thickness' input, and if its > 0 and 'Stinger Width' is selected, to adjust the running stringer measurements down for the tread thickness.
This would only be for stringers where the treads are placed on top of the cuts.
What's the go?

I don't think he knows enough about it to build a staircase. He says that he's either got an inch too much at the top, or an inch too much at the bottom, so he must have plugged an extra inch into his original calculations somehow.
It's like rat says. He should forget about the tread thickness and only concentrate on the top of the tread for marking out, then mark the thickness of the tread down from that.

Just had a quick look at your calculator, and it is correct.As Pawnhead said, the rise is taken to the top of the tread, and then material thickness is taken from that after setting out the rise.He must be attempting to set out a cut stringer rather than a housed stringer.If he wants a cut stringer, then he needs to cut the thickness of the tread down from the set out.

tools

Since your stringer layout isn't the actual timber dimensions, I think you're good to go. I'd avoid any complications with entry of the tread thickness. Perhaps just add a note that timber dimensions should be adjusted for the thickness of the tread. One would think that a real carpenter would be able to make his/her cuts from the work points you've provided, with allowance for the treads.

Joe

Looking at the calculator now - Thanks for the link

GMC