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.
Composite decks tend to cost more up front, but require less maintenance and care over time, making them cheaper in the long run. The average 16-by-20 foot composite deck costs $15,437, which breaks down to just under $50 per square foot.omposite decks tend to cost more up front, but require less maintenance and care over time, making them cheaper in the long run. The average 16-by-20 foot composite deck costs $15,437, which breaks down to just under $50 per square foot.