Layfast SBS is Class A Fire Rated Under Tile and Shingle Roofs

By MBTechnology. 

Class A fire rating helps protect against dangerous flame spread and penetration into the interior. 

To address the ongoing need for a fire-rated residential roofing assembly, MBTechnology has been able to achieve a Class A Fire Rating for its roofing underlayment marketed under trade name of “layfast SBS ®.” This rating applies to layfast SBS® membrane when used under UL approved tile and shingle roofs. 

According to Stephen L. Quarles, senior scientist, Insurance Institute for Business & Home Safety, Richburg, South Carolina, "In order for a given roof covering or assembly to be considered Class A, fire cannot penetrate through the roofing assembly into what would be the attic. Surface flame spread and ember generation requirements must also be met." 

The Class A rating gives building and homeowners peace of mind that there home will have extra protection in the event of a fire, or flying embers from nearby fires.  

Layfast SBS® is MBTechnology’s premiere SBS modified bitumen underlayment. The addition of SBS rubber to asphalt gives layfastSBS an elastomeric property, which is not available in common felt. layfastSBS also contains a higher percentage of asphalt for increased waterproofing protection. It’s the perfect upgrade to common 30/40# felt and is available in three grades: TU35, TU43 and TU70.     

                Approval: ASTM D226, D4601, ICC approved 

                Warranty: 10-, 15-, 20- and 30-year limited material warranty 

Learn more about MB Technology and layfastSBS in their directory, dowload the brochure,  or visit www.mbtechnology.com.  

About MBTechnology 

MBTechnology was founded in 1983 and specializes in manufacturing SBS Modified Bitumen Roofing & Underlayment systems. These include a variety of systems, which can be applied through the use of cold adhesives, self-adhered, mechanically attached, heat welding, or hot asphalt. The company specializes in manufacturing SBS-modified asphalt (bitumen) roofing membranes for residential and commercial application. The basic technology was developed in Europe and is one of the fastest-growing segments of both the commercial and residential roofing markets.