What type of flashing is recommended for headwalls and sidewalls?

Counter-flashing is specifically recommended for headwalls and sidewalls because it is designed to prevent water penetration at the intersection of different building elements. This type of flashing is installed over the top edge of the base flashing or roof membrane and is typically used where walls meet roof surfaces. The primary purpose of counter-flashing is to direct water away from the wall and into the drainage system, ensuring that any water running down the wall does not seep behind other building materials.

Properly installed counter-flashing can significantly enhance the weatherproofing of these critical junctions, reducing the risk of water damage, mold, and deterioration of structural elements. In contrast, other types of flashing serve different functions; for example, base-flashing is typically placed at the base of walls or parapets, step-flashing is used around roof penetrations and chimneys, and seal-flashing is used to create a watertight barrier around windows and doors, which may not provide the same level of protection against wall and roof intersections as counter-flashing does.