Before insulation is placed on the roof deck, the surface must be clean, dry, free of debris, water, ice or snow, and suitably prepared by removing all defects that might affect the quality of the application. Insulation shall be neatly fitted to all roof perimeters, penetrations and abutments. No more insulation 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. The Firestone PolyIso insulation boards are suitable for adhered, ballasted and mechanically attached single-ply roofing systems.
Polyiso insulation boards must be installed by using fasteners and plates, hot bitumen or Firestone approved insulation adhesives.
- Mechanically Attached System
Fasten the insulation boards with a minimum of 5 approved fasteners and plates per 1.22 x 2.25 m board. Additional fasteners may be required due to the presence of air/vapour barriers, in areas of high wind loads and/or around the perimeter of the roof. Please refer to local wind uplift requirements and/or contact the Firestone Technical Department.
- Ballasted System
For ballasted roof systems, the top layer of Firestone insulation may be loose laid or adhered. If mechanical attachment is specified, contact Firestone Technical Department.
- Fully Adhered System
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 the following minimum requirements:
- Thicknesses up to 40 mm: minimum 16 fasteners per 1.22 x 2.25 m board
- Thicknesses up to 50 mm: minimum 12 fasteners per 1.22 x 2.25 m board
- Thicknesses up to 100 mm: minimum 8 fasteners per 1.22 x 2.25 m board