When it comes to flat roofs, selecting the appropriate material is crucial to ensure longevity, durability, and protection against the elements. One option that has been commonly used for many years is tar paper. Tar paper, also known as roofing felt or roofing underlayment, is a thin layer of material impregnated with bitumen (a black, sticky substance). In this article, we will discuss whether tar paper can be applied to a flat roof, exploring its benefits, drawbacks, and alternative options.
Benefits of Tar Paper on a Flat Roof
1. Water resistance
Tar paper is known for its excellent water-resistant properties. By creating a barrier between the roof surface and the elements, tar paper can effectively prevent water infiltration, protecting the underlying structure from potential damage caused by leaks.
2. Added insulation
Tar paper provides an additional layer of insulation to a flat roof. This can help to regulate temperature fluctuations inside the building, enhancing energy efficiency and reducing heating or cooling costs.
3. Protection against UV rays
One of the primary causes of roof degradation is prolonged exposure to harmful ultraviolet (UV) rays. Tar paper offers a certain level of protection against UV rays, extending the lifespan of the roofing material and minimizing the need for repairs or replacements.
Drawbacks of Tar Paper on a Flat Roof
1. Vulnerability to tears and punctures
While tar paper provides some degree of protection, it is relatively prone to tears and punctures. When subjected to foot traffic or other sharp objects, the material can easily be damaged, compromising its effectiveness in preventing leaks.
2. Limited lifespan
Compared to other roofing materials, tar paper generally has a shorter lifespan. Depending on the quality and environmental factors, it may last anywhere from 10 to 20 years. This relatively short lifespan may necessitate more frequent maintenance and replacement, resulting in increased costs over time.
Alternative Options for Flat Roofing
1. Modified bitumen roofing
Modified bitumen roofing is a modern alternative to tar paper. It consists of multiple layers of polymer-modified bitumen applied to a flat roof, providing enhanced durability and protection against various weather conditions. This roofing system is highly resistant to tears, punctures, and UV rays, making it a preferable choice for many flat roofs.
2. EPDM roofing
Ethylene Propylene Diene Monomer (EPDM) roofing is another popular alternative for flat roofs. It is a synthetic rubber material that is both durable and flexible. EPDM roofing is resistant to water, UV rays, and extreme temperatures, making it a long-lasting option for flat roofs.
3. Built-up roofing
Built-up roofing (BUR) is a traditional method that involves alternating layers of tar or asphalt and roofing felt, followed by a layer of gravel or another protective material. This system offers excellent durability and protection against leaks and punctures. BUR is often used for larger flat roofs and can provide a long lifespan with proper maintenance.
While tar paper can be applied to a flat roof, it is important to consider its drawbacks and alternative options. Tar paper provides water resistance, insulation, and protection against UV rays, but it is susceptible to tears and punctures and has a limited lifespan. Modern alternatives like modified bitumen roofing, EPDM roofing, and built-up roofing offer increased durability and longevity. Consulting with a roofing professional can help determine the most suitable choice for your flat roof, ensuring optimal protection and longevity for your property.