Bituminous Membrane Roofing Systems Explained

Bituminous membrane roofing systems are a popular choice for commercial and industrial buildings due to their durability and cost-effectiveness. They can last up to 20 years with proper maintenance.

One type of bituminous membrane is the APP (Atactic Polypropylene) membrane, which is made from a type of plastic polymer that provides excellent resistance to heat and water. It's often used in areas with high foot traffic.

Bituminous membranes can be applied using various methods, including the torch-on method, which involves heating the membrane with a flame to melt the bitumen and adhere it to the roof deck. This method is commonly used for large-scale projects.

The thickness of a bituminous membrane can vary, but it's typically between 1.5 to 3.5 mm, depending on the type and application.

Bituminous membrane roofing is a type of roofing system that uses a flexible, waterproof membrane to protect buildings from the elements.

This membrane is typically made from a mixture of bitumen, a type of asphalt, and other materials like fiberglass or polyester.

It's a popular choice for buildings because it's relatively inexpensive and easy to install.

The membrane is usually applied in a series of overlapping layers, with each layer overlapping the one below it by about 6 inches.

This helps to prevent water from seeping through the membrane and into the building.

The bitumen in the membrane is what gives it its waterproof properties, and it's usually applied in a hot, liquid state to the surface of the roofing material.

As it cools, it forms a strong, flexible bond with the roofing material.

This type of roofing system is often used for flat or low-sloped roofs, and it's particularly well-suited for buildings in areas with high winds or heavy rainfall.

Modified bitumen membranes are a common choice for roofing due to their versatility and durability. There are two main categories: APP and SBS.

APP membranes, often referred to as "plastic asphalt", offer resistance to UV rays and are composed of asphalt mixed with plasticized polymers that exhibit elasticity under elevated temperatures.

SBS membranes, on the other hand, are like "elastic" or "rubberized" asphalt, blending asphalt with polymerized rubber to provide natural flexibility and elasticity.

Here are some key differences between APP and SBS membranes:

Ultimately, the choice between APP and SBS membranes depends on the specific needs and conditions of the roofing project.

SBS (Styrene-Butadiene-Styrene) Membranes are akin to "elastic" or "rubberized" asphalt, providing natural flexibility and elasticity. This unique property makes them an excellent choice for buildings with roofs that undergo significant expansion and contraction due to extreme temperature variations.

SBS membranes blend asphalt with polymerized rubber, which is a type of synthetic rubber called styrene-butadiene-styrene. This blend provides greater elasticity and flexibility compared to other types of membranes.

SBS membranes can be installed as a torch down roof using heat, cold adhesives, or as a self-adhering membrane. They become sticky at lower temperatures, making them a suitable option for various installation methods.

The flexible membrane of SBS allows it to negotiate sudden temperature swings, making it a reliable choice for commercial, industrial, and institutional buildings with low-slope roofs. Its water resistance and ability to withstand damage from extreme weather make it a trusted option in the industry.

Some SBS low slope modified bitumen roofing systems start with a base that must be nailed down before being covered with self-adhering membranes, mid-plys, and cap sheets. This process ensures a secure and long-lasting installation.

Here's a comparison of APP and SBS modified bitumen membranes:

Self-adhesive membranes are a type of bituminous membrane that's covered by a release liner, which is removed during application. This makes them a great option for wood substrates, flammable areas, small areas, vertical surfaces, or those areas with difficult access.

They're also perfect for retaining walls, basements, and below-ground structures. No torch is needed, making them a safer and faster installation option.

Some of the benefits of self-adhesive membranes include: no special equipment needed, excellent adhesion even at low temperatures, and no torch required.

Here are some specific situations where self-adhesive membranes can be used:

And here are some of the advantages of self-adhesive membranes:

Hot Melt Membranes are a type of bituminous membrane that's perfect for complex areas.

They're available in a solid block state and can be heated to form a fully-bonded waterproofing layer.

Hot Melt Membranes are commonly used for roofing, such as green roofs, and can also be used for podium decks, balconies, and terraces.

In fact, they're a great alternative for areas with many complex details, like car parking garages and bridges.

Hot Melt Membranes provide a strong, lasting bond, making them an excellent choice for civil engineering projects, such as foundations, slabs, and retaining walls.

Here are some common applications for Hot Melt Membranes:

In addition, Hot Melt Membranes can be used as an adhesive to bituminous sheets or insulation boards.

Laminate membranes are a type of bituminous membrane that consists of a layer of bitumen coated onto a fabric, such as polyester or fiberglass. This fabric provides the membrane with strength and stability.

The bitumen coating can be applied in various thicknesses, typically ranging from 0.5 to 1.5 mm. This allows for flexibility in terms of the membrane's performance and durability.

Laminate membranes are often used in roofing applications due to their ability to withstand harsh weather conditions and provide a durable, watertight seal. They can also be used in waterproofing projects, such as basement walls and foundations.

The fabric layer in laminate membranes helps to prevent the bitumen from cracking or degrading over time, ensuring a long-lasting and reliable waterproofing solution.

Modified bitumen roofing offers a range of benefits, including durability and flexibility, allowing it to withstand harsh weather conditions and expand and contract without cracking or splitting.

A modified bitumen roof can last for many years with proper installation and maintenance, providing reliable protection for your building.

Self-adhered membranes are a game-changer in the installation process, eliminating the need for torch application and reducing the risk of fire hazards.

These membranes are also simpler to install, streamlining the process for contractors and saving you time and money.

A modified bitumen roof requires little maintenance and rarely sustains damage, making it a low-maintenance option for property owners.

In the unlikely event of a fault, some manufacturers, like Garland UK, offer single-point guarantees, accepting full liability for the design, material, and quality of the installation workmanship.

With a modified bitumen roof, you can expect to save on energy costs, as reflective coatings can be applied to reduce heat absorption and lower cooling costs.

A modified bitumen roof installation can last 25 years or longer, depending on maintenance and upkeep, and can be designed to reflect solar and thermal energy, making it a "cool roof" option.

RestoreMasters offers warranties up to 30 years on modified bitumen roofing systems, giving you peace of mind and protection for your investment.