Base flashing turns up a wall from a roof or deck, and counterflashing comes down from above to cover its top edge. It is set into a reglet, a mortar joint or a surface-mounted receiver and lapped over the base by a few inches. The two pieces can move independently, so the building can move without tearing the waterproofing.
Counterflashing came off in the wind and now the term bar is just sitting out in the rain.
Also heard as
- counter flashing
- cap flashing
Related terms
Flashing
Thin sheet metal or membrane installed at joints and interruptions in a wall or roof to direct water back outside.
Termination bar
A flat metal or plastic strip fastened along the top edge of a membrane to clamp it to the wall.
Shingle lap
Overlapping layers so each upper piece lies over the one below, sending water down and out like roof shingles.
Reverse lap
A lap installed the wrong way, with the lower layer over the upper, so water is channeled behind it.