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Also referred to as brick flashing, this is metal work that ties a roof area together with a masonry wall. The shingles or other roofing material, and "step flashing", must be installed prior to the installation of the counter flashing.
It is highly recommended to precede the installation of the roof materials in crucial portions of the roof with "Ice & Water Shield". This is a self-adhering waterproof membrane that provides an invaluable level of protection against ice dams and wind-driven rain infiltration. Such areas would include chimney saddles and valleys that dead-end into a wall. It is also often used along eaves, to prevent infiltration into soffits during periods of heavy snow or ice accumulation.
It is easy to confuse the term "stepped counter flashing " with "step flashing". Stepped counter flashing looks like a staircase on the side of the wall. Step flashing is each individual piece of copper, aluminum or galvanized steel that is bent to a ninety-degree angle and inserted between each shingle or slate at each roof-to-wall junction. Counter flashing is then installed so as to overlap and seal the step flashing. We recommend the use of copper step flashing when using copper counter flashing, to prevent corrosion due to the contact of dissimilar metals.
Note: Due to potential issues that can arise with shingled roof saddles (shingled by others), we no longer perform the installation of counter flashing on chimneys, unless they are configured without a saddle (ridgeline chimney, rake chimney, etc.). If you would like to consider the installation of a custom copper chimney saddle in place of shingles, we would then be able to assist with counter flashing such a chimney. We apologize for any inconveniece this may cause, but we stand behind all our copper work with a limited ten-year warranty, and this policy allows us to continue to do so.
Counter flashing can be installed by the straight method or the stepped method. Both methods are depicted below.