Post by Oct 17, 2019 11:00:00 PM · 2 min read

Modified Bitumen Roofing Systems

Modified bitumen roofing is the advancement of built up roofing or BUR as it is commonly referred. Both modified bitumen and BUR systems consist of layers of sheets, hence the term “built-up.” The main difference is that the old style BUR systems heavily relied on hot melted tar and gravel or cold modified bitumen can be applied in a torch-on way, that is to say with heat, or adhered cold or self-sticking adherence.

The Types of Bitumen Sheet Materials

There are two common types of bitumen sheets used in commercial roofing systems.

A thermoplastic called Atactic Polypropylene (APP) is a modification that contains either a fiberglass mat or polyester. The membranes help provide insulation against outside cold and heat temperatures.

Styrene-butadiene-styrene (SBS) is a mixture of asphalt and a polymer of rubber. The membranes are known to increase the elasticity in adherence and the longevity of the asphalt.

Review of Types of Modified Bitumen Systems

Supporters of modified bitumen systems praise the durability factor and low maintenance. Adversaries mention the challenging installation of the layers as well as the hazard potential from the heat application from a torch-on (also referred to as torch down) system.

Manufacturers side with the modified bitumen’s stability and strength. The multi-layer membranes outlive their one-ply alternatives when skilled experts properly apply them to the roof.

By contrast, within a year, one-plys may wear out in some areas. The single layer roof may require extensive repairs especially after a heavy snowstorm resulting in costly expenses beyond the initial installation.

Modified bitumen though, because of its density and added polymers, has been known to last up to 20 years. To get the full life out of the modified bitumen system, routine annual maintenance checks are recommended.

Consult a Roofing Contractor who is Experienced

When your building requires a roof replacement, it’s best to contact an experienced contractor like Champion Roofing. A skilled expert who has installed bitumen roofing systems many times can determine which type of system would best suit your needs. What’s more, the trained roofing contractor will be able to provide a warranty to cover the expected life of the roofing system. Our warranties are extensive because we know it’s important. We enjoy what we do and happily provide warranties for all of our new roofs.

What Else You Should Expect from a Professional Roofing Contractor

The best roofing contractor realizes that installing a commercial roof is more than a weekend job. If you rush it, the quality will suffer. Leaks may happen and most likely sooner rather than later after the installation. They will need repairing. That’s a time and money loss that could have been avoided if the appropriate allocation was given to the application process. We’re trained and experienced. We allow enough time to get the job done correctly the first time.

The contractor should be bonded and insured. We believe there should be no worries for our customers as we do our job. Professionalism and respect are always given.

It might be time to replace your roof. A modified bitumen roofing system may be the answer to all of your roofing problems. Don’t rely on guessing at it. Contact us today!