The message
from "JennyC" contains these words:


"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 I`m of no use whatsoever. I`m a timber engineer. Chances are tho
that the design requirements are the same. BS codes have that effect
now. If it`s old then I`d be very carefull.

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