Counter Flashing

Counter flashing is a roofing component who’s job is to keep water from entering a roof-to-wall intersection.  It works by covering the top portion of an angle flashing (aka wall flashing).  Depending on the type of wall surface, a riglet is commonly cut into the wall.  This provides an embedded area for the top of the counter flashing to reside.  This top portion is then sealed with a high quality flexible caulk to keep water out.
Wall flashing & shingles in place.

Wall flashing & shingles in place.

Riglet cut into brick and ready for counter flashing.

Riglet cut into brick and ready for counter flashing.

Counter flashing installed

Counter flashing installed (but lacking sealant).

Completed counter flashing install on a job.

Completed counter flashing install on a job.

Side view

Side view

A side benefit to counter flashing is that its color hides the bright and shiny wall flashing.  Wall flashing comes standard in a galvanized finish.  Pictured above is also a kick-out flashing at the very bottom. There are other various flashing designs to keep water from entering a roof-to-wall intersection.  Angle flashing concealed by a counter flashing is one of the better approaches however.  The flexible sealant at the top allows the two materials (your wall covering and the counter flashing) to expand and contract.  Since the upper portion of the counter flashing is embedded it makes it very tough for water to penetrate the system.
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