Many companies offer to install new shingles or roofing materials over an existing roof, a practice known as a “roof overlay” or “layover.” However, this approach presents several significant issues. First, without removing the old materials, there’s no way to properly inspect the roof deck, potentially masking or creating underlying problems. If your roof develops a leak, diagnosing the issue with multiple layers in place becomes much more difficult, leading to unsuccessful repair attempts. Additionally, it’s hard to address ventilation concerns without tearing off the old roof.

Furthermore, overlays do not usually involve replacing flashings or accessories, which have a limited lifespan. This can compromise the long-term performance of your roof, as the new materials are more susceptible to environmental stress and wear out faster.

Another downside is the negative impact on your home’s value and curb appeal. In many regions, including the Pacific Northwest, a roof overlay can reduce your home’s resale value, potentially offsetting any initial cost savings. These reasons are why Valentine Roofing always recommends a full tear-off and replacement for any roof installation, ensuring a thorough inspection, proper ventilation, and a longer-lasting, more attractive result.