Aluminum Window Head Detail Leaks Are Usually a Sequencing Problem
The leak usually starts above the stain When an aluminum window shows damp at the top corners or a brown line under the head reveal, the first instinct is to blame the frame seal or the glass. On site, that guess is often wrong. The water that shows up inside usually entered somewhere else in the assembly, then traveled until it found the lowest-pressure exit. An aluminum window head detail that is built as a layered system can keep that water moving outward. A head detail built as a single bead of sealant cannot. ...