Deck2Wall Spacer model SWS is now approved for use with Spax Powerlags. The approved screws are available in 5/16-inch and 5/8-inch diameters and T-Star and hex-drive heads. The polypropylene spacers are designed to be installed between a deck ledger and the house to create a gap that allows water and debris to flow through, promoting circulation and drying while preventing rot and decay. A 12-pack of 5/8-inch-diameter spacers costs approximately $28.