back to back 90's or 45's to get down deeper
ok so my ground work plumbing has been istalled, inspection tomorow. i nedd to get the main sewer line deeper. it leaves the addition with proper coverage but then at 3' out the existing grade changes and doesnt leave enough coverage on the pipe so i want to get it deeper. currently the pipe passes thru the foundation and then 2' out has a clean out then a piece is just stubbed out 3' (plumbing inspection only does 5' past building)
my question is= is it better to use long sweep 90's for a vertical drop or is it better to use 45's for this? i am concerned the 45's would allow the liquid to leave the solids since it would be greater then 1/4" per foot....