Structural Rust, Floor Pans and Sills
Symptoms
Perforated metal underneath the car. Soft, crumbling steel. Visible rust from inside the cabin (carpet lifted).
Cause
Water ingress through deteriorated seals, combined with road spray from underneath, attacks the floor pans and sills relentlessly over six decades. The enclosed sill cavities trap moisture and rust from the inside out.
Fix
Cut out the rusted metal and weld in new panels.
Reproduction floor pan sections and sill panels are available from Rare Spares and similar suppliers.
Budget $2,000-5,000 per side for sills, $3,000-8,000 for full floor replacement.
This is skilled work, poor welding repairs are worse than the original rust.
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