Why is plastic not used in home construction? | Science Questions ... Feb 26, 2014 ... Plastic materials are used in several ways in home construction. ... Here we are using the common meaning of the word "plastic": a synthetic moldable solid. ... Plastic siding such as vinyl is often shaped to look like wood ... Pure plastic is not used as the beams, planks, and wall studs that hold up a house for...trex vs veranda decking - green composite decking Products Case. Seventrust Vs. Veranda Decking | eHow. Seventrust Vs. Veranda Decking. Seventrust and Veranda are two name brands in the newest family of wood composite materials.