As a homeowner, you probably want the best bang for your buck when it comes to a new roof. More and more people have decided to take the plunge and convert their roof from asphalt shingles to metal. It’s a good decision, considering the increased durability, environmental friendliness, and long life you’ll get.


But if you decide to have a metal roof installed, what happens to your old asphalt shingles? The good news is, your metal roof can be installed right on top of the old roof. The vast majority of metal roof installations are placed over the old asphalt. Here’s a few reasons why:

  • Believe it or not, but from a weight standpoint, the metal roof on top of the asphalt is lighter. Remember that steel shingles weigh only 1/4th of the weight of asphalt, and aluminum shingles are only 1/8th the weight of asphalt. It probably weighed more when the last layer of asphalt was originally installed. 
  • It’s more environmentally sound to cover up shingles instead of ripping them out and throwing them away in a landfill. Did you know it takes almost 300 years for an asphalt shingle to decompose in a landfill? That’s not exactly sustainable. On the other hand, metal roofs can be recycled immediately and turned into new materials. Neat!
  • Having asphalt shingles uninstalled is an unnecessary cost. Why spend that money when you can put it towards a nicer roof?
  • By layering the metal roof over the shingles, the thermal resistance of the roof assembly is boosted and energy efficiency to the home is increased.
  • During heavy rain storms and high winds, old shingles or parts of the roof can be torn off. A durable metal roof causes this to become a non-issue.
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