Why Trex? It's outdoor living, elevated. Trex is one of the world's top decking & railing brand and the inventor of wood-alternative composite decking. From the beginning Trex has committed to helping both homeowners & contractors create a low-maintenance, high-performance backyard retreat that can handle the outdoors without depleting them, and will do so for decades. Because your weekends should be spent relaxing on your deck, not repairing.