Hi, I am trying to drain 40 sq meters of patio using 100mm ag pipe. I do not know how deep to dig the trench and how much metal / sand ?? I should be using. Also, what fall is appropriate to this product over about 40 meters? Any help would be greatly appreciated. Thanks, Gerry. (atrik)
It depends on where you con. and what kind of weather you have. If it is cold go about 42′, if it is good warm weather all yr. then go from your connection point and try to give it a 1/4″ to the ft. Put down a 6″ bed of sand to lay pipe on and cover with 12′ and the rest of way with dirt, let me know if you need anymore help.