Copper And Aluminum Corrosive Gutter Flashing

Additionally the use of galvanized nails screws flashing or drip edge on copper roofing or copper gutters should likewise be avoided as such less noble.

Copper and aluminum corrosive gutter flashing.

When this is not possible choose a second metal that is not likely to lead to galvanic corrosion or use a physical barrier to separate the two metals. Use aluminum flashing and fasteners in contact with aluminum copper flashing and copper nails with copper roofing gutters etc. This type often called erosion corrosion occurs when rain falls on a non copper roof such as tile slate wood or asphalt. When water collected over a large surface is diverted or collected by a relatively small copper flashing or gutter the copper may deteriorate.

The farther two metals or alloys are separated on the table faster the corrosion of the less noble of the two will. Additionally the use of galvanized nails screws flashing or drip edge on copper roofing or copper gutters should likewise be avoided as such less noble. Salts increase the electrical conductivity of water. Zincalume steel in contact with or receiving of run off water from lead is prone to corrosion.

Pure zinc or aluminum are suitable alternatives although neither are as workable as lead. For example rain water run off from a copper roof going into aluminum gutters and downspouts will result in traces of copper salts in the run off wash accelerating corrosion of the aluminum. For example rain water run off from a copper roof going into aluminum gutters and downspouts will result in traces of copper salts in the run off wash accelerating corrosion of the aluminum. When water collected over a large surface is diverted or collected by a relatively small copper flashing or gutter the copper may deteriorate before it develops a protective patina.

The discharge from drain pipes on rooftop air conditioning units can be very corrosive particularly if the piping is copper and the drainage goes into galvanized steel scuppers conductor heads or gutters. Another type of corrosion occurs at the drip edge of inert roofing material conducting water into a copper gutter or valley. Anodized aluminum is considered compatible with all other metals.