In-floor, adjustable, track assembly for sliding panels with a build-in weep system, including a track, extending upward from a base, for engaging the undercarriage of a vertically-oriented panel, and supporting rectilinear motion therealong, an upright splash guard, parallel to and spaced slightly apart from one side of the upright track and forming, with the track, a channel therebetween with the base, for directing moisture from the bottom of the panel into the channel, at least one collection pan mounted under the channel and accessible through an aperture to collect moisture from the channel, and a hose for drawing off the moisture from the channel.