What Is Built Up Roof

Layers of Materials Used in BUR Systems

In commercial and industrial structures, built-up roofing (BUR) is a frequently utilized roofing system. This roofing system is renowned for its toughness and capacity to withstand severe weather. The BUR system comprises numerous layers of various materials that combine to provide a sturdy and watertight roofing structure.

• Base Layer

The base layer is the first layer of a BUR system. Usually, it is constructed from a cover board or a rigid insulating board. The foundation layer’s job is to create a level, even surface on which the other layers can be put. Moreover, the building gains insulation from this layer, which aids in temperature control and lowers energy expenses.

• Vapor Retarder Layer

The second layer in a BUR system is the vapor retarder layer. It keeps moisture from penetrating the roof system since it is constructed of thin, flexible material. This layer is crucial in humid climates because it stops moisture from growing on the underside of the roofing system. The vapor retarder layer additionally supports the insulating layer’s integrity.

• Base Ply Layer

The third layer in a BUR system is the base ply layer. This layer is made of fiberglass or organic mat saturated with asphalt. The purpose of the base ply layer is to provide strength and stability to the roofing system.

• Interply Layer

The interply layer is the fourth layer in a BUR system. It is made of a fiberglass or organic mat saturated with asphalt. The interply layer is applied over the base ply layer, providing additional strength and stability to the roofing system. It also serves as a bonding layer for the cap sheet layer.

• Cap Sheet Layer

The cap sheet layer is the top layer in a BUR system. It is typically made of coarse or smooth-surfaced material, such as asphalt or modified bitumen. The purpose of the cap sheet layer is to provide a waterproof barrier and protect the underlying layers from UV rays and other environmental factors. The cap sheet layer also gives the roofing system its finished appearance.

Benefits of BUR Systems for Commercial and Industrial Buildings

Built-up roofing (BUR) systems have been famous for commercial and industrial buildings for over a century. These roofing systems offer a range of benefits, making them a cost-effective and durable choice for property owners. Here are the key benefits of BUR Systems for commercial and industrial buildings:

• Durability

One of the primary benefits of BUR systems is their durability. These roofing systems are designed to withstand harsh weather conditions, including high winds and heavy rains. They are also resistant to fire and have a long lifespan, saving property owners money on replacement and maintenance costs.

• Energy Efficiency

BUR systems also offer excellent energy efficiency benefits. The insulation layers in the system provide an effective barrier against heat transfer, which can help reduce energy costs by maintaining a consistent indoor temperature. This makes BUR systems an ideal choice for buildings in both hot and cold climates.

• Versatility

BUR systems are versatile roofing options that can be customized to meet the specific needs of a property. They can be designed to accommodate rooftop equipment, such as HVAC units and solar panels, and can be installed on flat or low-slope roofs. This versatility makes them a practical choice for various commercial and industrial buildings.

• Cost-Effective

BUR systems are a cost-effective roofing option. While the upfront installation costs may be higher than other roofing materials, the system’s long lifespan and low maintenance needs can result in significant cost savings over time. Furthermore, the energy efficiency benefits can lead to lower energy bills, further reducing overall costs.

Installation Process of BUR Systems

The installation process of a Built-up Roof (BUR) system is a multi-step process that requires careful planning, preparation, and attention to detail. Here are the step-by-step instructions for installing a BUR system:

The installation process of Built-Up Roofing (BUR) Systems can be complex and time-consuming, but with careful planning and attention to detail, it can be completed successfully. Here are the step-by-step instructions for installing BUR Systems:

• Prepare the Roof Surface

Ensure the roof surface is clean, dry, and debris-free, including old roofing material. The surface must be smooth, even, and free of any protrusions.

• Apply the Base Sheet

Apply a layer of a base sheet typically made of fiberglass or polyester felt to the roof surface. Use an adhesive to secure the base sheet, ensuring no wrinkles or bubbles.

• Install the Insulation

Install a layer of insulation over the base sheet. This can be either rigid insulation or a layered insulation system, depending on the specific needs of the building.

• Apply the Interply Sheet

Apply an interply sheet over the insulation layer, securing it with an adhesive. This layer helps to provide additional protection and support for the roofing system.

• Install the Cap Sheet

Finally, install the cap sheet over the interply sheet, using an adhesive to secure it in place. The cap sheet can be made of various materials, including asphalt or modified bitumen, and is the final layer of protection for the roof.

Maintenance and Repair of BUR Systems

Maintenance and repair of Built-Up Roof (BUR) systems are essential to ensure their longevity and effectiveness. Regular maintenance includes inspecting the roof for any damage, checking for any punctures, cracks, or blisters, and ensuring that drainage systems function correctly. Removing any debris or vegetation that may accumulate on the roof is also essential. 

Repairs should be done immediately to prevent water from seeping into the building, leading to further damage. Repairs may include patching punctures or replacing damaged materials. Hiring a professional roofing contractor for maintenance and repair work is advisable to ensure quality and safety. Proper maintenance and repair of BUR systems can extend their lifespan, reduce overall costs, and prevent significant problems.