Steel roofing can be installed over shingles, but most roofers do not recommend it. Installing steel directly on top of your old shingles can trap moisture underneath and cause rot. The best practice is to remove your old shingles first, then install steel roofing on a clean roof deck. Steel roofs last 40 to 80 years, making them a smart long-term choice. According to RubyHome, metal roofing costs between $10.00 to $17.05 per square foot for standing seam metal panels. This is more than basic shingles, but you get decades of protection.
Why Remove Old Shingles First?
Old shingles trap air and moisture under your new steel roof. This causes wood to rot and your roof to fail early. Steel roofing works best on a solid, flat surface.
Roofers prefer a clean deck because it allows proper fastening and ventilation. Moisture gets trapped when you layer materials.
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What Does Steel Roofing Cost?
Steel roofing costs more upfront than asphalt shingles. According to RubyHome (2025), basic asphalt shingles cost $4.25 to $4.95 per square foot. Steel shingles cost $8.00 to $12.65 per square foot. For a 1,700 square foot roof, steel installation ranges from $6,800 to $68,000 depending on materials and complexity.
However, steel roofs last much longer. According to RubyHome, metal roofing lasts 40 to 80 years, while asphalt shingles last only 20 to 30 years. This means fewer replacements over time.
How Long Does Steel Roofing Last?
Steel roofs are built to last. Most steel roofs stay strong for 40 to 80 years. Some metal roofing systems last even longer with proper care.
| Roofing Material | Lifespan |
|---|---|
| Basic Asphalt Shingles | 20 years |
| Architectural Asphalt Shingles | 30 years |
| Steel Shingles | 40-80 years |
| Concrete Tiles | 100+ years |
Should You Remove Old Shingles or Reroof?
Reroofing means layering new material on top of old shingles. Removing old shingles means stripping them first. For steel roofing, removal is the better choice.
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According to RubyHome (2025), 33% of homeowners replace roofs due to leaking, and 33% face storm damage. Proper installation prevents both. Removing shingles costs more upfront but saves money later by preventing leaks and rot. Your steel roof will perform better and last longer when installed on a clean deck.
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If you need help with your roof, reach out to a trusted roofing company for clear pricing and reliable service.