Can Hidden Drainage Be Applied in Aluminum Window Frames?

Hidden drainage channels in aluminum windows maintain clean, uninterrupted sightlines while efficiently shedding water. Instead of visible weep holes, frames incorporate internal gutters that collect infiltrated rainwater. Water is directed downframe into concealed vertical drainage cavities, exiting at discreet slots or vents hidden beneath panel joints. These internal cavities align with the rainscreen air cavity behind metal facade panels, allowing back-ventilated drying. Seals between the window and panel closures are designed to channel any residual moisture into the hidden drainage tracks. For ceiling integrations—in soffits or overhangs above windows—the same drainage detail extends into the ceiling panel support rail, preventing water from pooling behind ceiling carriers. Maintenance hatch access panels can be integrated flush with ceiling panels to allow inspection of the drainage network. With proper gasket compression and slope (minimum 2 % pitch toward outlets), hidden drainage keeps both aluminum window and facade systems dry and free of staining, all without compromising minimalist aesthetics.