Modified roofing systems provide a durable, long-lasting, weather resistant low slope roof option. Modifiers are added to standard roofing asphalt to replace plasticizers removed during the distillation process. Bitumen is reinforced with fiberglass or polyester fiber matting in order to increase durability and strength. The two most common types are SBS and APP. The use of SBS (styrene-butadiene-styrene) increases the flexibility of the membrane and allows it to have stronger expansion and contraction capabilities. APP (attactic polypropylene) increases the aging ability of the roof system. SBS is often the more popular system as the synthetic rubber additive increases the products flexibility.
- The rolls of these roofing materials are factory-manufactured, ensuring quality control.
- These systems are well-suited to expand or contract with the movement of the building they protect.
- The modified bitumen roof systems can be finished with a variety of surfaces that enhance their resistance to oxidation and damage from UV rays more popular system as the synthetic rubber additive increases the products flexibility.