Leaking Metal Roof? 4 Effective Repair Options

A leaking commercial metal roof doesn't always require replacement. Here are 4 effective options from least to most comprehensive.

Option 1: Targeted Sealant Repairs

For isolated leaks at specific fasteners or seams, targeted sealant application is the fastest and lowest-cost fix. Clean the area, apply compatible metal roof sealant, and seal the specific failure point. Best for: one or two isolated problems on an otherwise sound system.

Option 2: Reinforced Tape System

Reinforced fabric tape embedded in compatible sealant is used to seal longer seam runs, flashing transitions, and areas with multiple small failures. More comprehensive than point repairs but still targeted. Best for: a section of roof with concentrated failures.

Option 3: Silicone Coating Restoration

A full silicone coating restoration seals the entire roof simultaneously — all fasteners, all seams, all rust spots — under a continuous new waterproof membrane with a 10–20-year renewable warranty. Best for: roofs with widespread fastener and seam failures across large areas. Cost: $2.50–$5.00/sq ft.

Option 4: Spray Foam Plus Silicone

When insulation improvement is also needed, spray foam applied before the silicone topcoat adds R-6.5 per inch. Best for: metal roofs with both leak and insulation problems, particularly when the building has high energy costs. Cost: $4.00–$8.00/sq ft.

When Replacement Is Required

If the metal panels themselves are structurally compromised — severe corrosion, panel collapse, or structural failure — replacement is necessary. Get a structural assessment before investing in restoration.