Radiant Barrier Roof Decking
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A radiant barrier can be effective with an asphalt shingle roof only when installed inside the attic either to the underside of the roof decking or to the underside of the roof rafters.
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.
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Radiant barrier roof decking. Radiant barrier applied either under the roof rafters or under the roof sheathing is probably the most common application of a radiant barrier but many homeowners shy away from it because they dont fully understand what radiant barrier is or how it works. Other kinds of radiant barriers combine reflective materials usually aluminium foil with materials like plastic films cardboard and kraft paper. There is a misconception that if the heat is coming in through the roof shingles and. This reflection insulation also has high mechanical properties making it perfect for load bearing applications in construction.
Some of thefacts they list are. Radiant barrier installation attic radiant barrier installation most of the heat entering a home comes through the roof. It reduces attic temperatures by up to 30 degrees fahrenheit and it blocks up to 97 of radiant heat. In these attic space applications there is an air space below the radiant barrier.
Installed in over 15 million homes in the united states lp techshield panels also lower attic temperatures up to 300 f. As the original 1 brand of radiant barrier sheathing lp techshield panels vaporvents technology prevents moisture buildup during and after construction while blocking up to 97 of radiant heat in roof panels. Radiantguard radiant barrier foil insulation installed in an attics can reduce attic temperatures by up to 30 degrees when stapled with a staple gun to the underside of roof rafters by reflecting up to 97 of the radiant heat that strikes its surface thereby reducing heat. For a shingled roof there isnt really a way to add a radiant barrier unless you were re decking or building a new roof on top of the old one the new roof being metal or tile with the required air space minimum the foil needs.
Manufacturers of this installation method often tout the savings in labor costs in using a product that serves as roof decking and radiant barrier in one. The osb techshield radiant barrier osb is engineered to improve energy efficiency.