Single Ply Roofing Systems

Built-up Roofs (BUR) – What is Built-up Roofing?

Built-up roofing uses multiple and alternating layers of material that literally builds up the roof as you progressively add layers of protection. These layers or membranes are composed of bitumen which is how this type of roofing also comes to be known as Bitumen Roofing. Bitumen refers to the use of an asphalt or coal tar with a reinforcing sheet known as a felt.

 

While fiberglass felts are commonly used for asphalt bitumen roofs, polyester felts are available. Typically, the asphalt is hot-applied, however, when appropriate or needful a cold-applied asphalt solution is available. A cold-applied asphalt uses a chemical solvent to make the asphalt pliable instead of heat. The membrane is either adhered to the substrate in bitumen, or a base sheet (i.e., a heavy felt) is mechanically attached.

 

Modified Bitumen (MB) – What is Modified Bitumen Roofing?

Modified Bitumen membranes display a toughness and resistance to abuse which may be consistent with a longer lifespan. They are composed of pre-fabricated, polymer-modified asphalt sheets. The polymers are added into the bitumen and enhance particular properties of the bitumen. The quality of Modified Bitumen sheeting is highly dependent on the specific materials used and compatibility of the bitumen and polymers, and the recipe used during the blending process. C&I Roofing uses three primary types of Modified Bitumen products, as well as field-applied modified mopping asphalt:

Atactic Polypropylene (APP) Modified Bitumen
Atactic Polypropylene (APP) polymer is mixed together with asphalt and fillers and processed into rolls of prefabricated sheet. This prefabricated sheet (acap sheet) is generally reinforced with fiberglass, polyester or a combination of both. C&I Roofing selects the best APP Modified Bitumen membranes for your particular roofing project. These are: smooth or unsurfaced unsurfaced; embedded with mineral granules offering a variety of colors; or factory-surfaced with metal foil (aluminum, copper or stainless steel). The aluminum foil is available in colored finishes. APP MB membranes are generally resistant to high-temperature flow.
Styrene-Butadiene-Styrene (SBS) Modified Bitumen
Styrene-Butadiene-Styrene (SBS) polymer is mixed together with asphalt and fillers and processed into rolls of prefabricated sheet with reinforcement and surfacing similar to APP MB sheet. SBS sheets generally have good low-temperature flexibility.
Styrene-Isoprene-Styrene (SIS) Modified Bitumen
Styrene-Isoprene-Styrene (SIS) polymer is mixed together with asphalt and fillers and processed into rolls of self-adhering, prefabricated sheet also similar to APP MB sheet. These are available with embedded mineral granules or a factory-laminated UV-protective surfacing, such as aluminum foil and are protected with release paper to keep the sheet from bonding to itself while rolled.
Styrene-Ethylene-Butylene-Styrene (SEBS) Modified Bitumen
Styrene-Ethylene-Butylene-Styrene (SEBS) polymer is mixed together with asphalt to form a SEBS modified asphalt compound. The SEBS modified asphalt is reheated at the job site a specially-designed tanker or kettle. The hot modified asphalt is applied in a manner that is virtually identical to Built-up Roofs (BUR). The membrane is typically surfaced with aggregate. SEBS modified mopping asphalt is extremely expensive, and therefore not commonly used.

 

Which Roofing System Is Right For My Commercial Building?

Every building has different needs based on the inhabitants usage. Commercial & Industrial Roofing has the experience to understand the different needs and properly evaluate your buildings roof, and then present you with the best, cost effective solutions. We will explain the advantages of each solution offered, so that you can make the best informed decision based upon your specialized needs. Contact C&I Roofing today and let us help you and your building’s roof.

 

Contact C&I Roofing or Call 619.465.3737.

Built-up Roofs (BUR) – What is Built-up Roofing?

Built-up roofing uses multiple and alternating layers of material that literally builds up the roof as you progressively add layers of protection. These layers or membranes are composed of bitumen which is how this type of roofing also comes to be known as Bitumen Roofing. Bitumen refers to the use of an asphalt or coal tar with a reinforcing sheet known as a felt.