Solarboard has a radiant barrier glued on on side of 7/16" or 1/2" of OSB sheets, which will bounce back the sun radiation by 99% before it will penetrate the home and/or structure.
Solarboard is a radiant barrier sheathing product for roofs and exterior walls that consists of heat-reflecting foil laminated to OSB.
We have not used it, but here is the link to the product’s spec sheet for anyone that is interested:
http://www.norbord.com/na/cms/wp-content/uploads/2015-Norbord-OSB-SDS-ver1.2.pdf