Abstract: A guide track for the bottom ends of the pickets of a folding door or the like comprises a galvanized steel elongated channel member having upwardly diverging sidewalls extending from a basewall, and a securing flange inclined downwardly and outwardly from the top of each sidewall. The free edge of each sidewall is lipped and lies substantially in the plane of the basewall, the lips extending outwardly and upwardly from the securing flanges. The guide track is disposed in a recess in the floor with the concrete or like flooring material surrounding the securing flanges and lips, filling the space between each securing flange and the respective sidewall to support the sidewall, and encasing the lips to prevent dislodgement of the guide track.