This depends on the r values of insulation installed design of the building and other factors.
Roof sheathing with radiant barrier.
Other kinds of radiant barriers combine reflective materials usually aluminium foil with materials like plastic films cardboard and kraft paper.
Thermostat radiant barrier roof sheathing can help you earn leed points under the nahb green building standard.
Installed in over 1 5 million homes in the united states lp techshield panels also lower attic temperatures up to 30 f.
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.