Should I use rigid foam plus fiberglass insulation for a finished basement? (re: PA UCC/”2018 I Code series”) – GreenBuildingAdvisor

My local township follows PA UCC codes which in turn follows “2018 I Code series”.

If I understand correctly, that requires basement walls to have R15/R19.

I was planning to use 1″ rigid foam (R-5) + fiberglass insulation (R-13) but I don’t think that meets code?

Does that mean I need 2″ rigid foam (R-10) + fiberglass insulation (R-13) for a total of R-23?

(I’m trying to learn myself the correct method because I’ve had 5 contractors each telling me different things and requirements…)

If I use rigid foam + fiberglass, do I need unfaced insulation?