Modified Bitumen Roofing in Central California
Dunlap Roofing Company
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 to your facility's roof. The two most common types are SBS and APP.
When added provides a plasticized quality to the asphalt. By adding 30% APP, the asphalt is able to be stretched up to 50% of its original length. The APP modified asphalt is reinforced with a polyester mat and manufactured into a roll product. These membranes have extra asphalt on the back side which allows it to bond to the substrate through applications such as heat welded or torch applied methods.
When combined with asphalt, it produces rubberized properties. By adding 10%-15% SBS to the asphalt it is then able to be stretched six times its normal length and then can return to its original size once relaxed. This helps deal with the stresses of normal expansion and contraction of a roof. Reinforcements for SBS modified asphalt include fiberglass, polyester, or a combination of both. These membranes are most commonly applied with hot asphalt or cold adhesive. There are also self adhering SBS membranes, which contain an adhesive backing.
Self Adhered – The bottom surface of the membrane is covered with an adhesive and release paper. Once the paper is removed the adhesive allows the membrane to adhere to the substrate without the use of additional adhesives.
If you have any questions about modified bitumen roofing, call Dunlap Roofing Company, the best choice for your business in the Fresno and San Diego, CA areas.
Roof maintenance is vital to the longevity and proper performance for the life of the roof. The condition of the roof at the time of re-roofing could also play a factor in the re-roofing choices available to you.
Have a leak in your business’ ceiling? Notice peeling shingles on your business? Has a storm come through and possibly damaged your roof? We offer roof inspections and repair for all kinds of roofs in the Fresno and San Diego areas.
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