How can I protect my underground sprinkler PVC pipe from tree roots?
PVC pipe is the most common pipe used for sprinklers, but in areas that require a lot of bends, there is also something known as "funny pipe".



Funny pipe example

This flexible pipe is not the same as drip irrigation pipe.  It is thicker and a slightly different material.  Some brands are UV resistant and it can be used above ground in flower beds or in shallow areas where it may get uncovered.

Tree roots may still kink this pipe over time, but the should not break it because it will just bend and flex out of the way.