So its our 3 yr house-iversery today and I'm feeling a bit bummed cause we haven't really done anything on the house for a while.
So I hit on the idea to finally redo the stairs off of our back porch. In order to get the deck 'normalized' I need to rebuild the stairs with code compliant guard rails, width and rise-run which it is not compliant with now.
As you can see the back stairs are a bit wonky being supported by a tacked in place post and that weird cross beam.
Stair Math: The cities code for stair cases is the minimum individual run for the stair case can be 9" and the maximum individual rise can be up to 8". I've got to figure out how to fit a stairway that does not exceed those numbers into the given constraints of total rise-run.
If I guess that I am going to need 10 risers I get (total rise)/(number of steps)= 81"/10= 8 1/10" individual rise...that's too high a riser by 1/10th of an inch! I don't want to risk an anal inspector so I'll have to make 11 risers work. That gives me an individual rise of 81"/11= 7 4/11". 4/11"? geez that sounds convenient! Dang. The math for the individual run works out better thank goodness... individual run = (total run)/# of risers= (99 1/4")/11=9 1/44" individual run. I think I can fudge the landing 1/4" so I can use an even 9".
Here's what I don't understand. The stair building section in my Taunton deck book says that the total # of treads will either be = to the number of risers or 1< # of risers depending on how the stringers are attached to the deck framing. Cept it doesn't really explain that at least not to me? So hopefully I'll have 11 treads and 11 risers right?
So it looks like I can make it a code compliant stairway without intruding into the side yard! It'll be steepish but we had a similar layout for the back stair on our last house and it wasn't too bad.
So, once someone confirms my math I figure I'll need 3 12' 2byb12's for the stringers and using a 1" nosing my treads will be 10" deep. For the treads I'll have to use a 1by8 and a 1by3 with a 1/4" of spacing in between to get the 10" actual...that'll look weird.
I still don't have any idea about what type of guard rail I'll need but I figure I'll use 3 4by4 posts, one on each end and one in the middle to support it.
Does anybody have any ideas on easy guardrail designs? I plan to build the entire thing out of brown pressure treated wood. (hope they make 1by3's in pressure treated.)
Any helpful input would be greatly appreciated.