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Can Metal Roofs Be Installed Over Shingles? Debunking the Myths

When it comes to upgrading your roof, the notion of installing a metal roof over existing shingles might raise some eyebrows. However, the truth is that metal roofs can indeed be installed over asphalt shingles, offering homeowners a convenient and efficient way to revamp their roofing system. Let's delve into the details of this process and the two methods used for installation.


Method #1: Direct to Deck – A Waterproof Shield


The first method is known as direct-to-deck. This approach involves installing a waterproof membrane directly over the existing asphalt roof. This membrane serves as a protective shield against moisture, safeguarding your home from potential leaks. Once the waterproof layer is in place, the metal roof is then installed over it. This method offers a seamless transition from the old to the new, ensuring your property remains well-protected and visually appealing. Additionally, this method eliminates the need to strip the existing roof, reducing waste and landfill impact.


A picture of a metal roof being installed directly over top of an asphalt roof
Direct to Deck Method

Method #2: Wooden Strapping – A Delicate Balance


The second method involves placing wooden strapping over the existing shingles before installing the metal roof. While this method is an option, it's worth noting that it comes with certain drawbacks. Wood is not a permanent material, and if not properly installed or maintained, it can deteriorate over time. This can lead to structural issues and even rot, compromising the integrity of your new metal roof. Additionally, installing a metal roof over wooden strapping introduces air space between the two layers, resulting in increased noise during rainfall.


A picture of a metal roof being installed over an asphalt roof using wooden strapping
Wooden Strapping Method

The Noise Factor and the Valley Metal Roofing Approach


Metal roofs, while highly durable, can generate noise when rain hits them directly due to their solid surface. However, when installed with proper insulation and underlayment, this noise can be significantly reduced. The situation changes when a metal roof is installed over wooden strapping. The air space created between the layers amplifies the noise, resulting in a less pleasant acoustic experience during rain showers.


At Valley Metal Roofing, we prioritize both functionality and comfort. That's why we only advocate for the direct-to-deck method. This approach not only eliminates the increase in noise but also eliminates the need for wooden products under the metal roof. By bypassing wooden strapping, we ensure your metal roof installation is a seamless process that maximizes both protection and tranquility.


The question of whether metal roofs can be installed over shingles has a clear answer: yes, they can. However, the method of installation matters greatly. At Valley Metal Roofing, we stand by the direct-to-deck method as the superior option, offering not only effective protection but also a quieter and more comfortable living environment. When considering a metal roof upgrade, choose a method that ensures lasting durability, environmental responsibility, and peace of mind.

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