What is a modified bitumen roof system?
Modified Bitumen (MB) roofing is an asphalt-based, close cousin of the Built-up-Roof (BUR) designed for buildings with low-slope or “flat” roof structures. With five layers of protection, it’s one of the most trusted flat roofing systems used in the industry today.
What is the difference between APP and SBS roofing?
The basic difference between SBS and APP is that APP-modified bitumen is a “plastic asphalt” and SBS-modified bitumen is an “elastic asphalt.” Why? When torching APP roofing membranes, the bitumen begins to flow like candle wax when it reaches temperatures above 300°F.
What is a SBS roofing system?
SBS modified bitumen roofing is a material made out of asphalt and synthetic rubber, making it an exceptionally flexible material for flat roofs. This material works best on low-slope commercial roofs, and many manufacturers use glass, polyester, or composite reinforcements.
How is modified bitumen roofing installed?
How is Modified Bitumen Installed? A modified bitumen roof generally consists of two layers: a base sheet and a cap sheet. The base sheet is often self-adhered to the roofing substrate. The cap sheet is either torched down, cold adhered, or self-adhered (Modified bitumen can also be applied in hot asphalt).
How long will a modified bitumen roof last?
The life expectancy of a modified bitumen roof depends on a multitude of factors, such as, home location, maintenance, and architectural design. However, manufactures suggest the rolled membrane roofing can last up to 20 years.
What is the difference between rolled roofing and modified bitumen?
Modified bitumen is approved for “flat” roofs with minimal slope, but roll roofing is not viable below a 2/12 pitch (two inches of rise for each twelve inches of horizontal run) with exposed nails, or a maybe little lower with concealed nail installation.
What is SBS and APP?
Atactic polypropylene (APP) is a plastic which when used with asphalt, gives what’s commonly called ‘plastic asphalt’. On the other hand, styrene-butadiene-styrene (SBS) is a synthetic rubber, creating the ‘elastic asphalt’. These. Modified Bitumen systems continue to be popular for a variety of reasons.
What does SBS felt mean?
The abbreviation for Styrene Butadiene Styrene is SBS. SBS are bitumen composed of elastomer. This material is a plastic that already has the elastic properties. The great advantage of SBS bitumen roofing is that it can properly absorb the working of underlying structures (such as insulation), because it can stretch.
What are the advantages of SBS system?
SBS rubber is flexible and has the memory to return to its original form. The addition of SBS rubber to asphalt increases the flow characteristics and improves the low-temperature flexibility and fatigue resistance of roofing asphalt. The end product is a high-performance, 2-3 ply system.
What is SBS torch?
Modified Bitumen Roofing, commonly known as “torch on roofing”, was born out of the desire to improve bitumen’s waterproofing characteristics by adding rubber (SBS) to the bitumen. The heat of a torch or hot asphalt is used to fuse layers of SBS membranes together creating the roof system.
What is the difference between built up roofing and modified bitumen?
Modified Bitumen (MB) roofing is an asphalt-based, close cousin of the Built-up-Roof (BUR) designed for buildings with low-slope or “flat” roof structures. Modified Bitumen roofs give designers and installers an even broader array of options than BUR.
How can you tell the difference between modified bitumen and rolled roofing?
Probably the easiest way to tell just by looking is the seams, the asphalt rolled roofing will have plastic roof cement in the seams, the mod bit will have melted tar squeezing out of the seams.
What kind of roofing system is mod bit?
Evolving with market demands, self-adhered SBS (styrene butadiene styrene) modified bitumen (‘mod bit’) roofing systems offer roofers a safe, clean and quick alternative to those installed by traditional methods.
What are the advantages of self adhered roofing?
And while another advantage of self-adhered roofing is a reduced training requirement, training is still important. An untrained crew can waste both time and material trying to properly apply self-adhered roll goods, especially in elevated temperatures.
What kind of insulation is used in bitumen roofing?
Modified Bitumen SBS Roofing Systems. 1 Polyiso. EnergyGuard ™ Polyiso Insulation. An insulation board made of glass fiber-reinforced cellulosic felt facers bonded to a core of isocyanurate 2 Polyiso NH. 3 HD ISO. 4 Gypsum. 5 Wood Fiber.
What kind of material is used in SBS roofing?
Surfacing: Fine mineral parting agent on the top side of the sheet. A polyolefin burn-off film on the bottom side enables the product to be applied using heat welding techniques. Polyester-reinforced SBS base or ply sheet. DynaBase PR is used as a polyester-reinforced base or ply sheet in a variety of multi-ply roofing systems.