Abstract: The floor system comprises spaced parallel horizontal planks, each including a metal inverted channel comprising a deck member having two spaced depending structural flanges and two laterally projecting edge channels thereon, each having a depending leg and an in-turned lower leg with a slot between each lower leg and the adjacent structural flange. U-shaped connectors extend between the planks and have upturned flanges with in-turned hook members received in the slots and interlocking with the edge channels. Soft rubber-like cylindrical stops are tightly fitted into the slots adjacent opposite ends of the connectors to prevent sliding movement thereof. Each inverted channel has a heat insulating resinous plastic cushioning cover with a top wall over the deck member, side walls enclosing the depending legs, and in-turned horizontal flanges clamped to the lower legs. Depending drip lips extend along the lower edges of the side walls of the cover.