Why do wrong fasteners corrode aluminum louver frames?

Field answer

Aluminum, steel, stainless, copper, and galvanized metals do not all play nice together in wet or coastal conditions. The wrong fastener can eat away the louver mounting holes and weaken the frame.

Check the louver material, support material, environment, and fastener schedule. Remove corroding hardware, clean damaged areas, and use manufacturer-approved compatible fasteners, isolating washers, coatings, or separation tape as required.

What to check first

• Look for white powder, rust stains, enlarged holes, or pitted aluminum.
• Identify fastener material and frame material.
• Check if the location is exterior, coastal, wet, or chemical exposure.
• Use compatible fasteners/isolation per project spec.
• Document damage before replacing hardware.

Why it matters

Galvanic corrosion can destroy mounting holes and compromise the louver support.

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Final direction belongs to the foreman, approved drawings/specs, manufacturer instructions, pressure/material schedule, employer policy, and AHJ/code requirements.