Blocking water intrusion around windows and doors is a must for preventing wall damage. Properly installed GreenGuard Flashings help deflect water that would otherwise enter the wall. The GreenGuard line includes a choice of two types of self-adhered flashing, both of which get the job done. GreenGuard Flashing has a rubberized asphalt adhesive that works well in most applications. GreenGuard Butyl Flashing adheres across a broad range of install temperatures and is available as both a straight line and stretchable versions to cover all flashing challenges.