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How to Install a Metal Roof Over Shingles: 3 Ways to Make This Project a Success

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If you’re looking to make the switch to a metal roof, but you’re on a budget, you may find yourself wondering: do I first have to remove my existing roof? After all, shingle removal adds time to your project and can be expensive. Feel free to raise the roof, because the great news is that you can install a metal roof without lifting a single shingle. 

Though, as always, we do recommend that you check your local regulations, as some building codes may not permit the installation of a metal roof without removing shingles first. But if this is an option for you, then here are our top three tips to get you started: 

1. Check Your Existing Roof’s Compatibility with Metal Roofing

While it definitely is possible to install a metal roof over shingles, unfortunately, it is not an option for every shingled roof to be topped with a metal roof. There are a few key things to evaluate about your existing roof. Once you consider these, you’ll be able to consider if installing a metal roof over your shingles is an option for you. 

Firstly, you’ll want to make sure that your existing roof is in good shape. If there is leaking or damage of any kind, you’re going to need to remove your shingles first. 

Similarly, you’ll want to assess the slope and shape of your current roof. A metal roof won’t be an option if your base is a shingled roof that has bumps, divots, or is generally misshapen or unbalanced. This is because the metal roof requires a smooth and even plane to be installed correctly. 

You’ll also want to make sure that your shingles were not installed on top of another roof. If you have multiple roofs already, the metal roof may not be able to be securely fastened to the actual building. 

Similarly, you’ll want to verify that your shingles are not too bulky or thick because this can hinder the successful attachment of the metal roof. 

2. Make Sure Metal Roofing is Right for You

There are a lot of reasons to go for metal roofing. For instance, metal roofs on average last significantly longer than shingle roofs, so even though they may cost more upfront, metal roofs might actually save you money down the line. They’re also practically fireproof and aren’t going to rot or become damaged by insects. 

But as great as metal roofs are, there are a few things to consider before you make the switch. 

This is especially true if you are contemplating layering a metal roof over a shingle roof, because the roofings options you have may be limited. 

For instance, you’ll need to make sure that you’re okay with the metal panel look. It’s a great choice that many people love, but it is also the only option if you are installing your metal roof without removing your shingles. Metal shingles exist and look great, but they can’t be put on top of existing roofing. 

You’re also going to want to look at photos and examples of metal roofs, to make sure that you like the pronounced continuous ridge vent. This is a feature of other roofs, but on a metal roof, it tends to be very distinctive, which may be a pro or a con, depending on your personal taste.

Additionally, while metal roofs are often considered to be tougher and more resistant to the elements than other types of roofing, they still have their own vulnerabilities. Large pieces of hail can harm your metal roof, so this could be a problem if you live in an area that is particularly prone to heavy hailstorms. Of course, this can also be a problem for shingles, but it's worth noting that if you expect lots of hail, then you might want to do research on your options before committing to a metal roof. 

3. Prevent Water Vapor From Getting Trapped

If you’re installing a metal roof over a roof with shingles, then you’ll definitely want to make sure that it is properly ventilated. Otherwise, water vapor could become trapped between the old and the new roof, and this can lead to nasty issues down the road. If moisture accumulates, then the shingles may start to rot, or your roof could even start to develop a mold problem. 

Luckily, there are a couple of ways to make sure that you aren’t bothered by these kinds of issues. 

One excellent solution is to install a metal roof that is vented. This will allow the water vapor to escape so that it doesn’t get stuck and cause you problems down the line. 

Alternatively, you can elevate your metal roof with furring strips. By placing these underneath your new roof, you can create space for air to flow and water vapor to escape. 

Are you ready to make a change to your roof or help your clients achieve a new look? Get a quote today!

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