01 May 1999
d. Repair Work by User. A common repair would be at a penetration or flashing that has loosened
or failed. Each type requires specific skill. See the SMACNA manual for recommended details and proper
gauges of metal for various applications.
e. Corrosion. Corrosion may be due to galvanic action such as from the use of the wrong fasteners.
Replace with copper, stainless, brass, etc., as recommended in the SMACNA Manual. Water flow from
up-slope copper roofs or flashings that contain copper salts will be corrosive to zinc and zinc-aluminum
(1) Joints. Transitions, penetrations, and flashings are subject to damage from movement, wind,
and foot traffic. Panel splices may be subject to leakage if roof traffic causes stress or distortion.
(2) Fasteners. Fasteners are subject to back out; washers to weather degradation or
overtorquing. Replace when necessary.
(3) Recoating. Terne coated metal requires field coating for corrosion protection. Recoat as
needed. (TCS does not require field coating.)