Easy way to close "holes" between floor and walls

[Vanuan]

No description provided.

[Vanuan]

We need a way to relate walls to rooms. If walls become thicker, we'd want room area to be proportionally reduced.

[Vanuan]

Now, you can create walls and than double click wall surrounded area with a room tool. But then you can accidentely move floor. There should be a way to "stick" floor with walls.