I am wanting to use a thin layer of styrofoam outside of the sheathing of my house as a thermal barrier... what i see out there (here in canada) is the standard pink (extruded) stuff and the white 'duro-foam' covered in a green vapor barrier which is quite a bit cheaper. I can tell that the durofoam is more likely to break, but assuming that i can install it in one piece, is there any difference in the lifespan/performance of these products? (mold? rot? disintegration?) the r-values are very close.
also would i still need to use housewrap outside of the styrofoam?