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Batten-in-Seam System

Firestone EPDM Batten-in-Seam System (BIS)


The Firestone BIS (Batten-in-Seam) System is a lightweight system for roofs where the roof deck is suitable for mechanical attachment and where smaller EPDM panels are preferred.


  • Adaptable to unusual roof configurations
  • Low material cost
  • Lightweight system


The system uses 2.28 m wide panels, which are loose laid over the substrate. When using reinforced membranes, panel sizes up to 3.05 m can be used. Perimeter zone panels may either be fully adhered or mechanically attached. Field zone membrane panels are mechanically attached with batten bars placed in the seams of adjoining sheets. Reinforced panels can also be mechanically attached using plates. The width of the panels can differ to accommodate for wind loadings. Adjoining sheets are overlapped at least 200 mm at side laps and 100 mm at end laps. The sheets are spliced with a self-adhesive 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.