Many homeowners go for the roof-over, a roof replacement method often seen as an efficient and cost-effective. Here, the new roof is installed over the old one — a stark contrast from the typical tear-off method in which the old roof is removed, leaving the structural supports intact to accommodate the new roof.
While the immediate appeal of lower costs and quicker completion times can be tempting, many roofers advise against roof-overs. Local roof repair and replacement contractor The Great American Roofing Company explains why.
No Chance of Repairs
A roof-over does not allow for a thorough inspection of the decking and underlayment, which are critical components of your roof’s structure. Once the new roof is installed over the old one, there’s no way of telling if the existing roof structure has underlying issues. Moisture, leaks, and structural issues can be concealed beneath the old shingles, allowing problems to persist or worsen over time.
Increased Weight and Structural Concerns
A new layer of shingles adds significant weight to a roof’s structure. Add snow buildup and strong winds to it, and the extra load can pose a real risk. This, in turn, puts the roof’s framing and decking beyond their limits. Roof replacement contractors are wary of these risks, understanding that a secure and long-lasting roofing solution requires meticulous attention to the load-bearing capacities of a home’s structure.
Roof Ventilation Issues
A roof-over can disrupt existing ventilation, resulting in a temperature imbalance and moisture buildup. Blocked vents can result in decreased energy efficiency and increased potential for ice dams in winter. The risk of ice dams and the subsequent water damage can be a significant concern as well. A tear-off, meanwhile, provides the perfect opportunity to ensure proper roof ventilation.
Warranty and Longevity Concerns
Manufacturers may not offer a warranty on shingles installed over existing layers, and even if they do, the coverage is often significantly reduced. A new roof installed on top of an old one might not be eligible for the same level of warranty protection. The diminished protection and potential for earlier roof failure make roof-overs a less desirable option.
Let’s Get Started!
For all your residential roofing needs, turn to The Great American Roofing Company. Our team does more than just fix a roof leak; we provide services that ensure the durability and weather performance of your roofing system. As a GAF Master Elite® roofer, we are proud of our proven reputation for completing quality work, are properly licensed and insured, receive ongoing training to remain the best in the business, and care about your satisfaction with the process.
To discuss your roof replacement needs, give us a call at (201) 825-2955, or fill out our contact form to request a free estimate.
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