These custom-engineered structural concrete insulating panels for floors, rooftops, interior and exterior walls have a 45-degree welded-wire truss design. They provide R-40 insulating performance and sound co-efficient protection of STC 50+. The Green Sandwich Panels are made of 40 percent recycled material by weight, 60 percent by volume. The waste is 100 percent recyclable. The panels are pest, mold and termite resistant and offer impact resistance against hurricanes, earthquakes, floods and tornados. The panels are seismic rated for 8.0+ earthquakes and can withstand 200 mph winds.