Fiber-cement siding directly attached to reflective side of foil-faced polyiso?

I’m installing fiber-cement lap siding (Nichiha) directly over 1/2″ reflective foil-faced polyiso (no furring/spacer strips).  Should I be concerned with the foil reacting with the fiber-cement?  I cannot find anything… I’m installing fiber-cement lap siding (Nichiha) directly over 1/2″ reflective foil-faced polyiso (no furring/spacer strips).  Should I be concerned with the foil reacting with the fiber-cement?  I cannot find anything…Read MoreGreenBuildingAdvisor