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Mechanically Attached System

Firestone Mechanically Attached System (MAS)


The Firestone EPDM MAS System offers an alternative to the RMA System in case of unusual roof configurations or roofs with a lot of penetrations and obstructions.


  • Adaptable to unusual roof configurations
  • Use of large EPDM panels
  • Fewer seams
  • Fast coverage, less weather sensitive
  • Lightweight system
  • High wind uplift performance


EPDM panels are loose laid on an acceptable substrate and mechanically attached with batten bars placed on top of the sheets. The batten bars are protected with 152 mm wide, self-adhesive QuickSeam Batten Cover Strips. Spacing of the batten bars differs to accommodate for wind loadings. In perimeter zones, membrane panels can also be fully adhered to the substrate instead of using batten bars. Adjoining sheets are overlapped a minimum of 100 mm and spliced with QuickSeam Splice Tape. All flashings around roof perimeters and penetrations are installed in accordance with Firestone specifications (PDF).

Prior to selection of this system, the specifier should evaluate the roof slope and determine whether the roof deck will provide sufficient pull-out resistance for the fastening system.