One of the main reasons to ensure that your windows are watertight is to keep dampness out of the walls. Once inside a wall, moisture can cause pest problems, mold and rot. Here, we’ll identify three of the most common mistakes that occur during window installations, which can lead to leaky windows.

3 Common Causes of Leaky Windows

  1. No Overhangs: You may have bay windows, arched windows and/or tall windows in your home. All would be fine if they were installed with every bell and whistle (sealants and flashings) to prevent water from leaking in. However, sections of a wall where there are no overhangs can present a problem. Homeowners typically think that the main functions of an overhang are to drain water from the roof and create shade, but it also prevents leaky windows by keeping wind-driven rain from entering walls.
  2. No Flashing: If flashing tape isn’t installed correctly, water can get behind siding and then drip behind the outermost edge of the window frame (mounting flange) and into the walls. In addition to flashing tape, it’s a good idea to seal windows with caulking.
  3. No Paint Seal: When the exterior molding that holds windows in place is painted, the paint should overlap slightly onto the glass. You might think that this is wrong, but the continuous film of the paint from the molding onto the glass creates a seal that helps prevent leaky windows. Smart DIYers and professional painters already know this.

At Dry Foundation Technologies in Asheville, NC, we offer basement waterproofing systems, foundation stabilization, and crawlspace moisture control systems. We look forward to helping you prevent the damaging effects of water on your property!