How Do I Install A Metal Roof Over Shingles?
Metal roofing is one of the best roofing options for most homeowners. Not only are these roofing systems visually appealing but are much more durable than the shingles. Considering to install a metal roof over the existing shingle is one great way contractors help build homes that not only maximize longevity but also save on the roof tear and wear expenses.
Can Metal Roofs Be Installed Over Shingles?
In the simplest terms, yes, one can be able to install a metal roof over the shingles. However, before considering this step, it is ideal checking with your local building department. In some areas, they will only allow re-roof over one-layer shingle, in others over two layers of shingles while in others it will not be an issue when one goes over the one-layer shingle.
Advantages of Metal Roofs Over Shingles
- By placing metal roofing over shingles, one can easily save on the labor costs of ripping the shingles off while also preventing them from being thrown into landfills.
- Installing the metal roofs over shingles also can help provide an extra layer covering your home, thus helping to further insulate it.
Tips for Installing the Metal Roof Over Shingles.
There are several ways in which metal roofs could be installed over the shingles. Here are some of the three ways that homeowners can consider when they need installing a metal roof over the shingles;
Remove the Shingles Before Installing the Metal Roof
The first critical way to use when installing the metal roof over the shingles is by removing the old shingles before adding the new metal roof. One of the key advantages of doing this is that one can be able to determine the presence of any rotten plywood that could need replacement before the installation of a new roof.
To identify the potential of these rotten or deteriorating plywood, the roofers could walk around the roof and feel the soft spots. When you have a bad leak in the roof, then it could be easy to get to the attic and look into the roof to see if you can see any plywood that could need replacements. With this done, you can be sure of having a strong metal roof installed over shingles as opposed to rotten wood.
Install Underlayment Right Over the Shingles Before Installing the Metal Roof
The second way of installing the metal roof over the shingle is through the application of the underlayment right over the old shingles. The key advantage of doing it this way is that this process is usually fast and requires minimal needs for it to be accomplished. Installing the metal roof over the shingles will need placing a barrier between however this is not usually highly recommended.
The metal roof could heat up or cool down causing contraction and expansion moving the barrier on the roof. The shingles could end up acting like sandpaper to the back of the metal roof. It gradually scraps away from the back and even exposing it to the bare steel.
Install 1×4 Purlins Down Over the Shingles Before Installing the Metal Roof
This is one of the most common methods that can be used in installing metal roofs over the shingles. The only thing that one needs to pay attention to is the plywood under the shingle roof to ensure it is in a good condition.