Metal flashing materials include, lead, aluminum, copper, stainless steel and zinc alloy. Metals can also have a coating such as galvanised steel, lead-coated copper, or anodised aluminum.
We always ensure sufficient expansion joints on long runs to prevent deformation due to expansion and contraction. Copper and lead cannot be used in contact with aluminum, zinc, or coated steel without an increased risk of premature corrosion.
Adhesive backed materials are useful during installation but adhesive will not last as long as metals, so we always recommend metal flashing when the budget allows.