All About Composite Decking | This Old House.When the less demanding plastic-composite decking appeared on the scene in the 1990s, homeowners happily adopted it, despite the higher price and limited .. Solid. Can be face-fastened or edge-fastened and has two usable sides. 2.5 pounds per foot. Starting at $4.60 per square foot; evergrain.com. 3. Open flange.