Level outer wall on foundation wall: Bottom Plate AND Top Plate?

[b8q]

I will start framing the exterior walls of the new entrance I am building. The extension is not large, 2 x 3.5 m. The foundation consists of a cast slab in the basement and subsequently built-up lecablock walls.

According to all the construction drawings I have seen, it is recommended that the upright wall studs (170x45 in my case) be placed on and attached to a top plate, which lies on the cross floor joists. See e.g. http://www.traguiden.se/TGtemplates/popup2spalt.aspx?id=4553&contextPage=5947

But on the other axis, which the drawing does NOT show? What should the top plate rest on then? Two longitudinal floor joists, i.e., with only 8 cm between them? Or can the wall studs perhaps be placed directly on the bottom plate, or would that result in too much point load on the base wall then?

 

[huggan]

I had only had undersyll on those two pages.

 

[b8q]

Thank you, that's what I thought too, (that's how you do it on slab on grade..), but I became a bit hesitant when I couldn't find a single drawing of it.