Proper window flashing is essential for preventing water intrusion around windows in new construction. Window flashing involves creating a waterproof barrier system that directs water away from the window openings and prevents it from entering the wall assembly. Here’s how to effectively flash windows in new construction projects:

Types of Window Flashing

There are several materials used for window flashing, including:

• Self-adhering flashing tape: This is a popular choice because it is easy to apply and forms a tight seal. It is made from a bituminous or butyl-based adhesive backed with a polymer film.

• Metal flashing: Durable and traditional, metal flashing (usually aluminum or copper) is used especially in climates or facades where extreme conditions are expected.

  Integration with the Water-Resistive Barrier (WRB)

  Proper integration with the building’s WRB is crucial. The flashing should be layered in a way that complements the WRB, ensuring that water moves down and away from the window, rather than behind the flashing.

  Sealing and Testing

  • Seal all penetrations: Use compatible sealants around the flashing, especially at corners and joints.

  • Inspect and test: Once installed, it’s a good practice to inspect the flashing for any gaps or incomplete seals and test with water if possible to ensure there are no leaks.

  Following these guidelines will help ensure that the windows in new construction are well-protected against water damage, enhancing the durability and comfort of the building. Proper window flashing is a critical aspect of building construction that contributes significantly to the overall performance and longevity of the structure.