Best Practices for Window Flashing

Proper window flashing relies on correct layering sequence rather than appearance, with each layer designed to shed water downward onto the layer below it. Hidden moisture damage can occur behind well-looking trim for years, making disciplined flashing installation critical to preventing wall deterioration.

Today’s durable exterior trim materials can make a poorly flashed window look fine for years, even though moisture is damaging the wall behind it. That makes window flashing less about surface appearance and more about disciplined sequencing: Every layer needs to shed water onto the layer below it.…

This story was originally published by JLC Online.