Technical Design Question, Wooden walls still need Tension band?

[CrawDaddy]

Thanks for the reply,

I was not planning on using plywood to sheath the roof, rather 1x6 t&g cedar as the exposed ceiling, covered by

insulation

and

moisture

barrier and metal roofing. So the roof assembly would not be quite as rigid as if I used plywood panels, but rigid enough to prevent racking I'm pretty sure. I am definitely planning to block between the rafters at the plate and also lock in the ends with solid 2x fascia.

So the force at the top of your 2x4 wall would be vertical, not angular.

Is this really the case? If you have your forces, as in weight of the roof, coming to the wall at an angle, doesn't there have to be some kind of horizontal component resisting the thrust? This is achieved by the tension band in yurts and most commonly in my experience with rafter ties on a gable roof for instance. This is the part I'm confused about, because I know that the top plate could be fashioned as one continuous piece of wood, but don't know how strong that would be. Also, unless I used brackets, hurricane clips or the like, the only connection resisting outward thrust would be the toenails through the rafters into the top plate.