jerry,
what is a relieving arch comprised of. is there a definition of how to make one and what type of material is it made of? dirt,concrete,wood? is there a definition in the i.p.c.? we still use the u.p.c. and it simply calls for sleeving or protection of piping thru or under walls and the commentary(not code) just shows a pipe run thru the dirt under the footing. so jerry i don't understand why a relieving arch can,t be made of dirt when a pipe is run say 12"s below the bottom of the footing?splain it to me