Tree Roots: Cut Out or Go Around?

[jbell36]

ran into a zone not coming on yesterday...the customer said they could hear a hissing type sound by a tree right next to the zone...dug down and found all kinds of roots pinching the poly lateral...now, the question is, do u guys usually just cut the roots out or try to re route the pipe?

these are pretty good size roots, i don't want to hurt the tree...a friend in town who does strictly irrigation says to cut them out, he never has issues with the tree suffering...i'm a little reluctant, but if this is common practice then i will get the sawzall