Simpson Strong-Tie says its Deck-Drive DCU Composite screw works in all kinds of composite decking including encapsulated boards. The head has inverted upper threads that seat the screw consistently and correctly; a “Quik Guard” coating allows the screw to be used with many types of treated wood framing; and the cap head is designed to prevent mushrooming. The screw is available in colors matched to most major composite decking brands and is an approved Trex fastener. It’s available in bulk and in a collated version for use with Quik Drive auto-feed driving systems. Simpson Strong-Tie, 800.999.5099,