Metal Roof Over Shingles?

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Alex Sparks
Alex Sparks
Updated - May 26, 2024

Metal roofs are a symbol of durability, energy efficiency, and lasting beauty. They're a dream come true for many homeowners. But what if your dream home already has a shingle roof? While installing a metal roof directly over your existing shingles might seem like a quick fix, it can lead to hidden problems that turn into a costly headache down the road.

Why Skipping Shingle Removal Can Be a Costly Mistake

Here's why experts strongly advise against installing a metal roof over shingles:

  • Building Code Violations and Uneven Surfaces: Many areas have building codes that prohibit this practice. Even if legal, achieving a level surface for proper installation over uneven shingles is difficult. This unevenness can lead to leaks, improper drainage, and future problems.
  • Reduced Longevity and Trapped Moisture: Metal conducts heat and cold more readily than shingles. Trapped moisture between the layers can cause condensation, leading to rust, mold growth, and premature deterioration of both the metal roof and your underlying shingles.
  • Ventilation Issues and Warranty Woes: Metal roofs require proper ventilation to prevent condensation. Modifying your existing ventilation system to accommodate a metal roof over shingles can be complex and expensive. Additionally, most metal roof manufacturers will void their warranties if the roof is installed over shingles.
  • Compatibility Issues, Aesthetics, and Extra Costs: Not all metal roofs are compatible with shingle substrates. The added weight of a metal roof might exceed your roof's structural capacity, especially if the shingles are old or damaged. Finally, a metal roof over shingles may not be aesthetically pleasing, and the additional labor required for proper installation can significantly increase the overall cost.

The Better Way: A Long-Term Investment

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For a successful and long-lasting metal roof, removing the existing shingles is the best course of action. This allows for a thorough inspection of the roof deck, proper ventilation installation, and a clean, secure base for your new metal roof.

Don't let your dream metal roof turn into a nightmare! Contact a professional roofer today to discuss the best approach for your specific needs and get a free consultation. They can help you achieve a beautiful, long-lasting metal roof that will add value and curb appeal to your home.