Hi all hope someone can help me with my calculations,
I'd sunk the posts for a pergola but as I've gone all grand designs I decided this shape would look good, especially with the polycarbonate tinted roof, however the conundrum is what is the minimum difference in height for a&b to c&d for the correct rain water run off?
Sorry for the terrible drawing.
Thanks for your help
I'd sunk the posts for a pergola but as I've gone all grand designs I decided this shape would look good, especially with the polycarbonate tinted roof, however the conundrum is what is the minimum difference in height for a&b to c&d for the correct rain water run off?
Sorry for the terrible drawing.
Thanks for your help