Firestone ISOGARD™ HD is a 12.7 mm thick Polyisocyanurate board designed for use as a cover board. It is a high-density, closed-cell, Polyiso foam core that has been manufactured with a coated fiberglass facer.

Key features & benefits

  • Protects. Conserves. Endures.
    The ISOGARD HD cover board spreads the load and protects the boards underneath. It therefore often pays, from a life-cycle cost perspective, to protect the insulation boards with ISOGARD HD cover boards.
  • Easy to use
    ISOGARD HD cover board is easy to cut and handle for quick fabrication around roofing elements such as drains or other penetrations, reducing installation time and labour costs. A single 1.22 m x 2.25 m sheet of thelightweight ISOGARD HD cover board weighs only 5 kg, meaning easy manipulation and placement.
  • An added measure of protection
    With a compressive strength of more than 800 kPa (5 to 6 times that of a normal PIR insulation board), ISOGARD HD cover board adds structural strength to the entire roofing system and helps to absorb the effects of hail, worker traffic and other potentially damaging impacts. Adding an ISOGARD HD cover board over a mineral wool insulation at least doubles the load capacity.
  • Environmentally friendly
    ISOGARD HD cover board is composed of mold-resistant material that does not support growth of damage-causing fungi and bacteria. The board is manufactured with a 100% fiberglass, mold- and moisture resistant facer. ISOGARD HD cover board contains 8% Post Industrial Recycled Content. It uses a HCFC-free blowing agent that does not contribute to the depletion of the ozone layer and there are insignificant amounts of global warming potential.
  • Outstanding performance qualities
    ISOGARD HD cover board leads to superior wind uplift performance, lays flat and requires fewer fasteners per 1.22 m x 2.25 m board compared to 25 mm Polyiso insulation boards. ISOGARD HD Cover Board has thehighest thermal performance (determined by ASTM C518) of any 12 mm cover board, and it is resistant to extreme weather conditions.

Product data

Thickness (mm) Thickness (inch) Dimensions (m) Dimensions (ft) Max. flute span
12.7 0.50 1.22 x 2.25 4′ x 7’4.5″ 70 mm

ISOGARD HD Technical Information Sheet (TIS)
ISOGARD HD Safety data sheet (SDS)

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