Why Roofing Contractors Don’t Like Roof-Overs

When the time comes to have your roof replaced, an ongoing debate arises whether to go with a complete tear-off or a roof-over. However, professional roofing contractors generally advise against the latter, which involves installing a new roof directly over an old one. Here are a few reasons why.

Undetected Structural Damage

A roof replacement project in which the old roof is removed allows the pros to perform a thorough inspection of the decking. This crucial step helps reveal signs of damage that must be addressed before a new roof is applied. Going the roof-over route skips this step, increasing the likelihood of serious structural issues since any deterioration or rot present will continue to worsen under the new layer of roofing material.

Additional Weight Concerns

The combined weight of old and new roofing materials is a significant burden on your home’s structure. The added stress may lead to compromised roofing support and that can cause major problems, especially in areas with high precipitation or wind events that are common in the area.

Ventilation and Warranty Complications

A roof-over project can also trap heat and moisture, compromising attic ventilation. This increases the risk of moisture damage, mold growth and reduced energy efficiency—all factors that affect the longevity and performance of your roof. Furthermore, many manufacturers void warranties if new roofing materials are installed over existing layers, as this contravenes installation guidelines designed to optimize roof performance.

Hidden Leak Sources

Troublesome leaks are harder to locate when they have to penetrate double layers of roofing. Water can enter through the new metal panels, permeate the old shingle layer and pool in unexpected areas—complicating the detection and repair process. Local weather patterns can exacerbate these issues, leading to more frequent and severe leaks that are difficult to resolve when obscured by a roof-over.

Persistent Underlying Issues

Merely covering an old roof doesn’t solve existing problems; it may mask them for a while, but they will inevitably reemerge. Homeowners seeking lasting solutions and peace of mind will find it more prudent to address issues directly during a complete roof replacement rather than opting for a temporary cover-up.

Comparing Roofing Materials

When contemplating different roofing materials, like metal versus asphalt shingles, a few factors must be considered, including durability, energy efficiency and aesthetic appeal. Diving into the intricacies of each option with the guidance of an expert contractor can ensure the chosen materials suit the specific needs of the home.

Rather than put your home at risk years down the line because of a roof-over, you’ll want to go with the safer route that is a complete roof replacement involving a tear-off. For that, you can always count on Triangle Home Exteriors to do it right the first time. When you work with us, you can rest easy knowing that you’re collaborating with a skilled, knowledgeable and trustworthy contractor that’s dedicated to making sure your home gets the protection it deserves. Call us at (919) 615-1101 or fill out this contact form to get an estimate.