Built-up roofing (BUR), also known as tar and gravel roofing, is a type of flat roof system widely used in commercial buildings for over a century. Its enduring popularity is owed to its multi-layer construction, which provides excellent durability, water resistance, and insulation.
Components of Built-Up Roofing
Built-up roofing comprises several layers of materials laid together to create a complete, sealed roofing system. Each layer plays a unique role in enhancing the roof’s performance and longevity.
Roof Deck
The roof deck serves as the foundation for the BUR system. This layer, typically made of concrete, steel, or wood, provides the structural support necessary for the remaining layers of the roof.
Vapor Retarder
Also known as a vapor barrier, this layer is applied directly to the roof deck. It prevents moisture from infiltrating the roof system from inside the building, protecting the roof deck and insulation from potential water damage.
Insulation
Insulation in a BUR system serves dual purposes: it enhances the building’s energy efficiency by reducing heat transfer and provides an additional barrier against moisture penetration. Materials commonly used for insulation include polyisocyanurate, expanded polystyrene (EPS), or extruded polystyrene (XPS).
Ply Sheets
This layer comprises multiple sheets of reinforcing fabrics, known as roofing felts or ply sheets, sandwiched between bitumen layers. Bitumen, either asphalt, cold-applied adhesive, or hot tar, acts as a waterproofing agent and binder for the system. The ply sheets can be made of organic mats, fiberglass, or polyester, adding strength and stability to the roof.
Surfacing
The final layer of a BUR system is the surfacing, which provides the first line of defense against environmental factors like UV radiation, temperature fluctuations, and physical damage. This layer is typically made up of gravel, slag, or mineral granules embedded in a layer of bitumen. It can also be a liquid-applied coating or a cap sheet.
Advantages of Built-Up Roofing
Built-up roofs offer several benefits, including:
- Durability: BUR systems are highly resistant to weather, mechanical damage, and fire.
- Waterproofing: The multiple layers of bitumen and reinforcing fabrics ensure excellent waterproofing capabilities.
- Low maintenance: Once installed, BUR systems require minimal maintenance.
- Cost-effective: Although the initial cost might be high, BUR’s longevity and low maintenance make it a cost-effective choice in the long run.
Roof King USA of Payson, AZ: Expert Built-Up Roofing Services
For top-notch built-up roofing services in Star Valley, AZ, businesses trust Roof King USA. Our team is experienced and proficient in installing and repairing built-up roofs. We use high-quality materials and employ meticulous installation processes to ensure the longevity and performance of your BUR system. You can expect expert advice, superior workmanship, and exceptional customer service with Roof King USA. Contact us today to learn more about our services.
