Steel fasteners are corroding an aluminum louver frame
Dissimilar metals plus moisture can destroy the mounting holes. Replace the fasteners with compatible hardware and isolation per the louver/environment spec.
Do not mix random steel screws into aluminum exterior louvers without checking compatibility.
Check
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.
Steps
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.
Say this to your foreman
The aluminum louver at [location] has corrosion around the steel screws. I checked the material contact. Do you want compatible fasteners and isolating washers installed per the submittal?