Putting Metal Roofing Over Shingles: How to Do It Right

Compared to shingle roofs, metal roofs are more durable and have a longer lifespan. Sometimes, a homeowner may want to keep their existing shingles but replace them with metal roofing. Building codes in some areas only allow one roof layer before requiring a complete tear-off. It can save time and money for homeowners.

Preparation

If you wish to build a metal roof over shingles, there are various issues to consider. These include addressing any potential long-term issues exacerbated by covering up a problem area with another layer of roofing and ensuring the new metal roof is not too heavy for your existing structure. Your roofing contractor must conduct a complete roof inspection to identify structural damage. They must also repair any leaking areas and ensure the gutters work correctly. They should also trim any overhanging branches that could fall on the roof during installation.

Underlayment

Your roof is a crucial component of your building envelope and is responsible for resisting air, water, heat, light, and noise. The right underlayment must be in place for your metal roof to protect it from damage during installation. A layer of felt underlayment is installed on top of your existing shingle roof, serving as an extra barrier against moisture infiltration. Felt also helps to reduce the noise that can come from metal panels. They can also install a slip sheet, an additional protection layer. It is recommended for particularly windy areas. It provides extra protection from dents or scratches during storms or high winds.

Panels

Due to its toughness, environmental friendliness, and stylish design, metal roofing is a fantastic home choice. It can be installed over shingle roofs as long as the old shingles are in good condition. Installing a metal roof saves the labor costs of removing the shingles and prevents them from being thrown in landfills. It also provides an extra layer to help further insulate your home. A roofing company carefully installs metal panels to ensure a tight fit and proper ventilation. They also offer there are no gaps or leaks before finishing the work. Then, they clean up the work area to leave your home pristine.

Flashing

Metal roofs can look great, but they are a significant investment. They also tend to have a more dramatic appearance than shingles, which may or may not be appealing to you. Building codes often limit how many roofing layers you can have on a structure before needing a complete tear-off. It can be problematic if you want to re-roof with metal but already have two layers of shingles on your existing roof. The problem is that the shingle layers can trap moisture and air between them. It can damage the metal roof over time, leading to leaks and other issues in your home.

Overlaps

As we’ve discussed before, installing metal roofing over shingles requires an experienced roofer who can assess the current structure of your home and resolve any issues that could compromise the durability of your new metal roof. It includes inspecting the underlying plywood layer to ensure it’s in good condition. After securing the battens, your contractor can begin installing the metal panels. They’ll also install an outside closure strip, which can be solid or vented. The vent strip allows airflow and prevents shingle granules from damaging the metal panels. As a result, the roof will last longer than it would have otherwise.

Ridge Cap

The ridge cap is the final piece to complete the metal roof over the shingles. It keeps water from seeping through during rain and storms. This piece is attached by closing rubber or foam closure strips. Employing a qualified roofing contractor is essential for this endeavor. Choosing someone experienced in residential metal roof installation will ensure your roof looks great and functions well for decades. A quality roof is an essential part of any home. A top may be kept in good shape with appropriate care and frequent inspections. It includes prompt repair of any leaks or other issues.