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 Wood is the most traditional, common and easily available material for decks; it is typically easier to work with than composite materials. 2  Composite deck installation can cost $25-$70 or more a square foot (8,000 -$22,400 for 16'x20). Composite deck installation can cost $25-$70 or more a square foot (8,000 -$22,400 for 16'x20).