"Dave Painter" wrote
"JennyC" wrote

What if there are no joists ?
My flat roof is made by flat concrete panels.........
Jenny

Then you will probably need a buildings inspector/surveyor.
The problem could be:-
The roof cracks
The roof collapses
The wall holding up the roof slips/slides/subsides
The foundations of the wall subside

You are unlikely to get a warning of any of these things until it is
too
late.

Window boxes are probably OK
grow bags against the wall are usually OK

Full blown raised beds, pots and other garden designs tend to
require a
building survey.
Which is where I came in.

Dave
BTW I do know of a decent survey service if you are reasonably close
to
Shropshire.

See my other post Dave.............
Also Shropshire is not close to Rotterdam :~))
Jenny