Hello- Having a little problem on building stair stringers. The vertical rise is 31" and the hortizontal span is 81". I have tried working it out on paper and the only thing I could come up with is the treads to be 11 1/2" and the risers to be 4 1/2". When I took a 2 x 12 and tried to lay it out I ended up running out of space do to the tread length. What I mean is that I was running out of wood space. I did take a stringer I bought from lowes and kinda used that as a template. The treads on it was 10" and the risers are 6 1/2". Maybe that is what is messing me up.I just need some help on this or ideas on what to do.Thanks

There are building regulations regarding stair construction, so you may be wise to get building permission that is if you are installing new stairs.

The normal relationship between the dimensions of the rise and going is detailed in Approved Document K, which states that twice the rise plus the going (2R+G) should be between 550mm and 700mm.

Your stairs are going to come in under that

As for the technicalities there is no reason why you can't make a very wide stringer by gluing two pieces together.

I've just sketched this out and you should be able to fit the treads within the 12" stringer

OK Thanks Guys. I must be sketching it out backwards or some thing. Can any one do a full sketch and put it on here. Maybe the problem is that my trade is plumbing but I do feel as if I able to do this.Thanks again

As I said in my earlier post it would appear that you have 7 risers and seven treads which just won't work, I have worked it out usingbased on 31" total rise and 81" total going with your 4.5" (112.5mm) rise which gives six goings of 343mm which will fit easily into a 12" deep stringer as you can see



If not this may make it easier to visualise



Hope that its all clear now

Jason