"JennyC" wrote in message
...

"Christopher Norton" wrote in message
...
The design requirement for a man load on flat roof joists will mean
it
can carry almost as many growbags as you require.

Loading is almost certainly not a factor in this case. If you want
me to
check then get the size of the flat roof joist, with the longest
distance between supports and I`ll do a quick calc to prove the
loading
for you. 8-)


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.