According to the National Institutes of Health and many other sources, the stress response is caused. by hormones. Hormones are chemicals, produced by glands and carried through the bloodstream, that. affect the activities of organs in the body.
Composite Decking Costs. 1  Average: $35 per square foot. 2  For polythylene-based composite decking, the average cost per square foot is $7.82. 3  For polypropylene-based decking, the average cost is $8.68 per square foot.
Some composites look plastic while others have more of the appearance of wood. Typical costs: A composite deck can cost $25-$70 or more a square foot, or $8,000-$22,400 for 16'x20', depending on the brand, project complexity and whether construction is done by casual labor or a licensed contractor.