Question about using Radiant Roof Sheathing for my Screen Porch
I'm getting ready to finally cover in part of my deck for a screen porch. I live in Georgia and we definitely get some heat and sun. I've read about radiant roof sheathing and other materials for house roofs, but would using radiant sheathing be useful to keep the porch cooler or is the fact that it is completely screened (no windows) enough to keep the heat from the roof from making the porch hot.
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Radiant sheathing is used in homes to prevent solar heat from radiating into attic spaces. Southern California, and their 2013 energy code, Title 24 2013, requires that all new residential wood construction use Radiant-Barrier Sheathing at the roof. Radiant-barrier sheathing, made up of either plywood or oriented strand board (OSB) with a thin layer of aluminum facing on one side, is installed to the roof rafters with the aluminum layer facing down. The aluminum is not used for its reflective properties but for its low emitting properties. The sheathing absorbs the radiated heat, yet the aluminum facing does not allow it transmit into the attic space. In the winter, when you are heating your home, the reflective property of the aluminum facing will reflect the heat back into the house and so the design of the radiant-barrier benefits your home during cooler times as well. It would not help much for a screened in porch since you would already have air movement through the screens.
The screened in element would negate it.