On Sep 5, 10:00 pm, grasshopper wrote:
Suppose a house has radiant barrier housewrap, then 1 x 2 furring
strips on the outside and topped with 4 x 8 hardie concrete siding.
Would there be any problem if I installed foil backed fiberglass in
the wall cavity with the foil facing the interior?

Just what exactly is your target?
What are you trying to achieve?