Concrete wall and floor not joining

[elisag23]

Hi,  I can't join these walls and floor together. Why does it happen? The structure of both categories seems correct..

[ToanDN]

Join the balcony floor with the lower wall, join the lower wall with the upper wall.  Switch join order if needed.

[barthbradley]

I can't get close to what you show by switching join order. I thinking something else is going on.  Post the File. 

[elisag23]

Here it is

[blank...]

You're using different materials. If this is what you're after, white layer material has to be the same one.

[barthbradley]

It's modeled wrong. Structural layers aren't going to be supported by Finish layers. The Floors need to physically contact the Structural core of the Walls.  Right now, they don't.