All grades are virtually knot-free, and tight grain patterns make this wood impervious to water. Requires predrilling for fasteners. But delivery can take up to three weeks. Use stainless-steel screws. Virtually indestructible, plastic-wood composites blend 30 to 50 percent recycled plastic with wood fibers for skid resistance and stainability.
Composite lumber is low-maintenance, and resists rot, insects and UV rays.
It's also splinter-free and easy to work with. Deck screws sink in and disappear. Trex, TimberTech and DuraWood EX come with 10-year warranties, while ChoiceDek and DuraWood PE are backed for 20 years. During construction, sawdust and shavings must be collected in a drop cloth because they aren't biodegradable. Composite lumber weathers to a light gray and can be painted or stained, though protective sealers aren't required.