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 decking price will be around $4,000 as well for a 400 square foot deck. Also remember that you may have to include design accessories such as railings and stairs. Include deck railing prices in your estimates before beginning to build. How much does it cost to build a deck also depends on the size.