Over the top roofing, often abbreviated as OTT roofing, represents a significant advancement in the construction and renovation industry. This method involves installing a new roofing system directly over an existing one, bypassing the need for a complete and costly tear-off. For homeowners and property managers facing roofing issues, understanding the intricacies of over the top roofing is crucial for making informed decisions that balance budget, time, and long-term performance.
The primary appeal of over the top roofing lies in its efficiency. A traditional roof replacement is a labor-intensive process that involves stripping away old shingles, inspecting and repairing the underlying deck, and then installing new materials. This process can take several days, is highly weather-dependent, and generates a significant amount of waste. In contrast, an over the top roofing project can often be completed in a single day. Since the existing roof remains in place, there is no exposure of the interior of the building to the elements, minimizing the risk of water damage during the installation process. This speed and reduced disruption make it an attractive option for commercial buildings, schools, and hospitals where operational continuity is paramount.
However, the decision to pursue an over the top roofing installation is not one to be taken lightly. It is governed by a set of critical conditions that must be meticulously evaluated by a qualified professional.
When the conditions are favorable, the benefits of over the top roofing are substantial. The most obvious advantage is cost savings. By eliminating the tear-off and disposal phases, labor costs are significantly reduced. Disposal fees for old shingles and materials, which can be considerable, are also avoided. Furthermore, the project timeline is compressed, meaning less time spent with a vulnerable roof and less inconvenience for the building’s occupants. From an environmental standpoint, over the top roofing is a form of recycling, as it reuses the existing roof layer as an added base, reducing the volume of waste sent to landfills.
The process of installing an over the top roof requires precision and expertise. It is not a simple matter of laying new shingles on top of old ones. The first step is a thorough inspection to confirm eligibility. Once approved, the contractor will meticulously prepare the existing roof surface. This involves cleaning the roof of all debris, replacing any loose or damaged shingles from the existing layer, and ensuring the surface is even. A key step is the installation of a new ice and water shield along the eaves (the edges of the roof) to provide an extra layer of protection against water infiltration, a critical upgrade that modern codes often require. Finally, new underlayment and shingles are installed directly over the prepared surface, following the manufacturer’s specifications to ensure the warranty remains valid.
Despite its advantages, over the top roofing is not a cure-all solution. There are distinct drawbacks that must be weighed against the benefits. One significant disadvantage is the inability to inspect the roof deck. During a full tear-off, contractors can identify and repair soft spots, rot, or other damage to the wooden decking. With an over the top installation, these problems remain hidden and could worsen over time. Additionally, the new roof will inherit any imperfections or unevenness from the old one, which can sometimes affect the final appearance and performance. The added layer can also make future repairs more complex, as locating the source of a leak becomes more challenging when there are two layers of roofing to navigate.
For homeowners, the choice often comes down to a trade-off between immediate savings and long-term value. An over the top roof may have a shorter lifespan than a roof installed on a clean deck. The National Association of Home Builders suggests that a properly installed asphalt shingle roof over an existing layer can last 20-25 years, whereas a new roof on a bare deck might last 25-30 years. Therefore, if a homeowner plans to sell the property within a decade, an over the top roof can be an excellent, cost-effective solution. However, for a forever home, the investment in a complete tear-off might provide greater peace of mind and longevity.
The concept of over the top roofing also extends beyond simple shingle-over-shingle applications. In the commercial roofing sector, it is a common practice for low-slope roofs. Systems like single-ply membranes (TPO, PVC) or modified bitumen can often be installed over existing built-up roofs (BUR) if the substrate is secure. This approach, known as a recover system, offers the same core benefits of speed, cost savings, and minimal disruption. Technological advancements have also led to the development of “cool roofing” materials that can be installed over the top, reflecting more sunlight and absorbing less heat, which can lead to significant energy savings for the building.
In conclusion, over the top roofing is a valuable and legitimate technique within the roofing industry. It provides a practical alternative to full roof replacement under the right circumstances. The decision to opt for this method should be made in consultation with a reputable, licensed roofing contractor who can provide a honest assessment of the existing roof’s condition and the structural capacity of the building. By carefully considering the pros and cons—weighing the immediate economic and logistical benefits against potential long-term limitations—property owners can determine if an over the top roofing solution is the right path to a secure and durable shelter over their heads.
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