Tapered Polyiso Foam Roof Insulation

Tapered Polyiso Foam Roof Insulation

Why EnergyGuard™ Tapered Polyiso Insulation?

EnergyGuard™ Tapered Polyiso Insulation provides a logical and economical answer for roofs that do not permit adequate positive drainage, like low-slope roofs. When correctly installed, tapered insulation helps eliminate problems due to ponding water and can extend the longevity of your low-slope roofing system. It is readily available in the two most popular and efficient tapers, 1/8" (3.18 mm) per foot (305 mm) (1%) and 1/4" (6.35 mm) per foot (3.18 mm) (2%).


EnergyGuard™ Tapered PolyIso Insulation is designed for use over structural roof decks to provide slope to drain and to provide thermally efficient insulation. When properly installed, it is suitable for use under built-up, modified bitumen, and most single-ply roofing systems.

For additional information, contact GAF Technical Services at 1-800-ROOF-411 or


  • Properly designed and installed, EnergyGuard™ Tapered Polyiso Insulation Systems virtually eliminate ponding water
  • High thermal efficiency
  • Easily installed with mechanical fasteners, hot asphalt, or loose-laid in a ballasted system
  • Low point and letter codes are designated on each board
  • Engineering design board layouts are available from your plans and field verified dimensions

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