How to build a half wall?

[RealRookie]

Hi. I want a half-wall to divide two rooms but still keep the light. The wall should not be larger than 120 x 120 cm and should be placed against a piece of protruding wall that remains from when the wall was demolished once. I am a complete beginner but still think that maybe - with a proper work description - I can try to build it myself. Can anyone suggest where I can find a good work description?
My main question is: do I need support against the ceiling when the wall is not larger than 120x120 cm? Or is some form of attachment to the floor (inside the wall which will be about 15 cm wide) sufficient? :S
Thanks in advance for answers and tips.

/Lena

 

[Jan-Å]

It depends on the load you will expose the wall to, and to some extent, what material it is. I imagine that a masonry wall needs less support than a wood-framed one, for example.
If you are building with studs that are covered with panels, I would recommend placing a post between the floor and ceiling at the outermost point to make it stable.
But the wall itself will stay up without it, it's mostly experience with running kids bumping into things or when you're in a hurry carrying something large and heavy and accidentally hit it that makes me want stable things

 

[Mats]

If you want it to be about 15 cm thick, I would use a frame of 45X95 along with a central rule. Then cover it with particle board/osb/plywood as the inner layer and then plasterboard on the outside.

 

[Magnus Brange]

Did it ever become a half-wall?

I'm thinking the same thing actually. How did you do it and how stable did it become?