When homeowners consider replacing a roof, one of the most important questions they face is whether they can install the new roof over the existing one.
Do I Need to Remove the Shingles First?
Technically, no. You can put a metal roof over a shingled one, and in some cases, it may be the only choice available to you. Still, the team at Authentic Restoration would not recommend it for several reasons.
Installing metal roofing over shingles has the potential for problems down the road. Underneath the shingles, there may be damage to the wooden roofing structure, as well as mold, rot, or water spots that could lead to further leaks and damage. As the years pass, you may need to remove the entire roof and replace it due to the problems caused by the shingles and underlayment.
Shingles also have abrasive surfaces, which can rub and wear on the metal’s backside as it naturally expands and contracts during hot and cold weather. This kind of wear can result in thin spots and leakage. It may also affect any warranties that Authentic Restoration offers on our work if we install the new metal roof.
Preventing Future Damage
When you install metal roofing over shingles, you increase the risk of future leak damage. As the metal roof heats and cools, moisture may become trapped between the new roof and the old roof. With no way to properly dry out, it may result in new mold and rot.
Inspecting the Underlayment Structure
Removing the old roof allows you to inspect the underlayment structure, including the rafters and sheets. In addition to detecting potential leaks, you can spot other signs, including buckling trusses.
Considerations When Installing Metal Roofing Over Shingles
If you do choose to install your metal roofing over your shingled roof, there are a few things you’ll want to consider as you prepare for the project.
First of all, before making any moves, you should consult your local building codes. Some areas will not permit multiple layers of shingles to be covered, while others require that all shingling be removed before a new roof may be put on.
It is also wise to choose a lightweight metal roofing material to avoid unnecessary stress on the trusses and damage to the decking and foundation. Aluminum and steel are two light options that may be used over an existing roof. As we noted before, however, Authentic Restoration does not recommend installing metal roofing over shingles.
Installing metal roofing over shingles has its disadvantages and may lead to severe problems and damage down the road. For many homeowners, it is the solution for their home’s roofing issues. In that case, taking time to consider the materials is vital, as is inspecting your roof for damage and potential problems. With proper preparation and attention to your roof, you can successfully install metal roofing and extend the life of your roof.
Get Help From the Pros
If you are interested in installing a new metal roof on your home, we at Authentic Restoration would love to help. Our Birmingham roofing company has the experience and knowledge to answer your questions and give you the right tips and information to safely and securely install your metal roofing.
Authentic Restoration is a fully licensed, bonded, and insured general contractor. Family-owned and -operated, we specialize in storm damage repair, restoration, and roofing replacement. For more information about metal roofing installation, or any other questions about your home’s roof repair and restoration needs, contact Authentic Restoration at (205) 982-5252 to schedule a free inspection.