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.
Even with a composite deck, the load-bearing supports are made of natural wood because it is sturdier. Composite decks generally cost about $30 to $45 per square foot installed. For a 16x20-foot deck, that works out to $9,600 to $14,400.