This depends on the r values of insulation installed design of the building and other factors.
Roof sheathing with radiant barrier.
The most effective radiant barrier sheathing is a structural roof sheathing panel which consists of an osb panel with heat reflecting foil laminated to one side.
Thermostat radiant barrier roof sheathing can help you earn leed points under the nahb green building standard.
Radiant barrier sheathing can lower your home s energy consumption by up to 17.
Rbs radiant barrier sheathing weyerhaeuser radiant barrier sheathing rbs comes pre fabricated with a reflective foil layer that reflects up to 97 of the sun s radiant energy minimizing heat transfer through the roof and insulation to interior living spaces.