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.
1 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. The 2013 Cost vs. Value survey by Hanley Woods Remodeling magazine estimates average regional prices of $14,126-$16,811 for a 16'x20' composite deck with a simple linear pattern, railings, three steps, and a built-in bench and planter, installed by a licensed contractor (about $44.74-$52.54 a square foot).