Wrap around stair calculations

[Naildrivingman]

I've recently taken on a project for my employer that involves an Ipe deck with a three rise continuous perimeter stair assembly.  When finished, the assembly will have two outside miters and one inside miter.  Essentially the assembly will be akin to roof framing in that it will have two hips (outside miter) and one valley (inside miter), with all the other stringers being commons.

The best way I can wrap my head around this is to cut the regular stringers and instal, then cut the hips/valleys as blanks with a plumb/seat cuts and temp fasten.  Once fastened, I can straightline off the commons, mark the corresponding rise and run, remove the blanks, connect the dots, cut and finish reinstall.

I'm sure there is a series of mathematical calcs that can be performed to accomplish this, but I don't them.  If anyone has suggestions/links, I would appreciate them.

Thanks,
Chris

 

[rizzoa13]

That's how I'd do it since I'm more of a visual carpenter than say a classically trained carpenter who goes by the math.

I don't really see how your going to cut stringers though to pick up the inside and outside corners. On the inside corners I'd install two stringers so the noses almost touch and then do solid blocking in between on all surfaces. Same with the outside corner I'd butt both stringers all the way out on the outside corner of the deck from either direction, straightline through from both directions and cut blocking to create a solid outside corner.

 

[Naildrivingman]

That's how I'd do it since I'm more of a visual carpenter than say a classically trained carpenter who goes by the math.

I don't really see how your going to cut stringers though to pick up the inside and outside corners. On the inside corners I'd install two stringers so the noses almost touch and then do solid blocking in between on all surfaces. Same with the outside corner I'd butt both stringers all the way out on the outside corner of the deck from either direction, straightline through from both directions and cut blocking to create a solid outside corner.

Yes, thank you.  I neglected to write that all corners would be composed of double stringers.  The "hips" would have the long point in the middle and the "valleys" would be the reverse.