Hi I can't seem to build a floor that seems to rest on my walls, it is above them. The floor was laid at top of a staircase so that sort of sets the height to be as high as the stairs.

What am I doing wrong? I am using wooden floors on metal walls - goes ok but for the gap between wall and floor/ceiling.

(and I laid down wooden floors on the house base - maybe that's the problem?)

Thanks!

If you are placing the second floor on top of a stair case then the gap could come from that. If you snapped the second floor onto the stair case it could be that

you are not using the elevated floor section, which is a bit thicker than the first floor pieces. I have built multiple mutli-floor structures with no gap,

it all about using the right pieces for the job.

I did just that yesterday and still had the gap OP mentions...wound up using a wood roof as flooring...none the wiser

You shouldn't have the gap unless you didn't use the right type of floor.

So I need a specific elevated floor thingy instead of normal floor? OK thanks?

I had gaps because of using the staircase section on an outside wall, its because the top of the staircase was a single floor rather than the double floor for the upper section. I moved the staircase to the middle of the house with no outside walls and seems to have fixed it.