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Mechanically Attached System

Firestone Mechanically Attached System (MEC)


The Firestone TPO Mechanically Attached System is a lightweight system that can be used where the roof deck is suitable for mechanical attachment.


  • Adaptable to unusual roof configurations
  • High wind uplift performance
  • Low material cost
  • Lightweight
  • Fast installation


In case of the Firestone TPO Mechanically Attached System, membrane panels are loose laid over the substrate and mechanically attached with plates and fasteners in the seams of adjoining sheets. The width of the membrane and spacing of the plates and fasteners differ to accommodate for wind loadings. Adjoining sheets are overlapped up to 150 mm in case of a seam with mechanical anchoring and 75 mm in case of a seam without mechanical anchoring. The sheets are heat-welded. 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 insulation fastening system.