Listed below are market average prices per foot for aluminum galvanized galvalume and copper gutter.
Do not mix aluminum gutters with galvanized.
Anodized aluminum is considered compatible with all other metals.
Installation is fairly easy because aluminium is lighter than galvanized steel.
The magical number in this chart is 0 65 or less and you are fine.
Salts increase the electrical conductivity of water.
The copper particles which help the roof resist algae growth may cause corrosion of the aluminum when moisture is present.
0 is the lowest on the scale.
Aluminium gutters resist rust better than galvanized steel gutters and the metal won t thin over time.
Aluminum gutters however cannot be installed on roofs that use algae resistant shingles 3 or copper flashing 4.
Aluminum with mild steel is 0 35.
Galvanized steel gutters can be installed nearly anywhere and with any roofing material.
Prices vary by state and gutter company but these averages are what you can expect to see in your market.
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.
While both materials can be customized to form seamless gutters aluminium is slightly easier to work with.
I have a reference document that looks for corrosion between different metals.
Aluminum with galvanized steel is 0 1.
Mild steel and galvanized steel are not very reactivewith each other.