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Method of application

Firestone ISOGARD HD and DensDeck Prime shall be neatly fitted to all roof penetrations and projections. No more boards shall be installed than can be covered with membrane and completed before the end of each day's work or before the onset of inclement weather.

Firestone ISOGARD HD and DensDeck Prime can be applied over insulation boards, over existing as well as new roof surfaces and under adhered or mechanically attached single-ply roofing membranes. ISOGARD HD and DensDeck Prime must be installed using approved fasteners and plates or Firestone approved insulation adhesives.

The number of fasteners per board needs to be determined based on a wind uplift calculation in accordance with local building codes and taking into account a minimum requirement of 12 fasteners per board in case of a fully adhered single-ply roofing membrane and minimim 8 fasteners in case of a mechanically attached membrane. please contact the Firestone Technical Department for more information on fastening patterns.

DO NOT use hot asphalt with ISOGARD HD.
DO NOT install ISOGARD HD under ballasted systems.