You often hear about radiant barriers, but what you don't hear is the importance of them being installed correctly. Master Builder, Matt Risinger, demonstrates the best way (and more importantly, the correct way) to install a radiant barrier on an exterior wall. Why should you use a combination of a radiant barrier with rigid foam insulation? If you remember back to high school science days, heat transfers three ways conduction, convection, and radiation. The rigid foam insulation addresses the conduction and convection and adding a radiant barrier addresses radiation.You'll find that adding a radiant barrier is best practice, but only when there is an air space. Without an air space," the technique is ineffective; you want to avoid using a radiant barrier when building homes with siding.Watch the complete video to learn more about the radiant barrier and rigid foam insulation combination.