It's absolutely OK to install a metal roof over the shingles. People are used to thinking that metal roofs are heavy or cumbersome. In fact, metal roofs are very beneficial because they are very light. They install quickly and come in large sheets instead of individual tiles.
In almost all cases, the answer is yes, you can put a new metal roof over an existing tile roof. This is one of the many reasons why metal roofs continue to grow in popularity: their installation does not require completely tearing off the existing roof, which is a time-consuming and costly job. Installing metal roofs over shingles is by far the best option when it comes to metal roofing. The added layer of protection and support provided by shingles creates a win-win situation.
The only time this configuration would not be recommended is if local codes or your HOA do not allow the installation of a metal roof over pre-existing tile roofs. Metal roofs can be installed over the existing roof without tearing off the shingles, provided local building codes allow it. While shingle removal is the preferred route, starting up is messy and increases labor cost. Yes, you can install a metal roof over existing asphalt shingles.
As long as you meet all the requirements of the local construction department, there is no need to remove the shingles before installing the metal roof. This is the fastest way to install, but it does not provide the flattest surface for the installation of metal roofs. Be sure to check local building codes before installing a metal roof directly over old shingles. It is always best to lay a subfloor and a sliding sheet before installing metal ceilings on plywood.
Metal roofs are found in conventional homes, thanks to increasing availability and improved manufacturing processes. You might think that a metal roof will attract lightning, but this is not confirmed by facts or statistics. If you are trying to reduce costs when it comes to pre-installing your metal roof over shingles, you should take these steps. Metal roofs should be laid flat on a vapor barrier because the steel condenses if there is any air gap underneath.
To get the highest quality roof possible, you should always start with a clean cover and replace all crucial roofing materials. Costs aside, one of the benefits of removing the old roof is that it allows contractors to assess the condition of the roof structure. Metal roofs have a number of benefits on their own, including their lifespan, exterior appeal, environmental friendliness, and durability. This allows the new underlayment to act as a line of defense should water somehow enter under the metal roof.
A standing seam metal roof system is a series of panels that lock together at the seams or are mechanically joined together. Metal roofs are isolated structural components, with no direct path to the ground inherent in their design.