No enough info.

It depends on the size of the horizontal cross piece supporting the roof.
The bigger the header, the longer the span.

Is there a snow load to be carried in the winter?

Steve


"donald" wrote in message
...
I am going to build a roof over an existing sandbox which is 12'x10'. How
many posts will be required for construction? I was thinking three posts
on
the long end and two on the short end. Is this sufficient or could I
actually get by with four?

Thanks in advance.