The rectangular design of Lumber Loc fasteners have the greatest edge contact with the decking groove and fit many brands of grooved deck boards
Lumber Loc fasteners are black, rectangular polypropylene biscuits that screw straight down into the joists rather than diagonally. The rectangular design has the greatest edge contact with the decking groove. Each clip has Y-shaped tabs at each end to gauge deck-board spacing, and the tabs compress under pressure to hold the planks while still allowing for expansion without buckling. The tabs stand proud of the fastener surface and come close to the face of 3/4-in. and thinner decking material. The single size fits many brands of grooved deck boards as well as custom-biscuited or custom-grooved wood deck boards.