Noticed a Small Hole in Your Window? Do Not Touch It, or It Could Cost You

That small hole at the bottom of a window frame is not a flaw, and sealing it could create more problems than it solves. The opening forms part of the window’s drainage system, allowing water and moisture inside the frame to escape safely.

Drainage holes can vary in size and shape. They usually sit along the lower section of the frame, although some designs conceal them. During repairs or sealing work, covering one can block the route intended to carry water out.

Trapped moisture may damage materials over time. It can contribute to corrosion in metal parts, deterioration of the frame and dampness around the wall. It can also lead to condensation problems, including fogged glass, and shorten the window’s service life.

The openings generally need little maintenance, but dust and small debris can eventually block them. If that happens, the obstruction should be removed carefully without damaging or widening the hole. Sealant should not enter the opening. Some windows have covers designed for drainage holes, but they should be used only when they still allow water and moisture to drain freely.