Black Stains Around Windows from Flashing Tape: Causes, Solutions, and Prevention
Window flashing tape is essential for watertight window installation, but homeowners and builders occasionally encounter an unsightly problem: black, tar-like stains oozing from the edges of windows. This phenomenon, commonly caused by rubberized-asphalt (modified-bitumen) flashing membranes, can mar the appearance of a home and signal potential performance issues. Understanding why these stains appear, how to […]
