Radiant foil acts like the reflector you put in your car windshield to keep your seats cool in summer. Radiant Foil is the only True Radiant Barrier, Spray on radiant barrier will eventually flake off and be less effective over time. Radiant foil create a air channel that diverts the heated air up and out to the ridge while rejecting 97% of the radiant energy AWAY from your attic. Ask us to come inspect YOUR Attic and see if Radiant Foil is right for you.