PU Adhesives


Firestone I.S.O. Twin Pack adhesive is a two-component low-rise polyurethane adhesive designed for anchoring acceptable roof insulation or cover boards to a building's structural deck, adhered vapor retarders, smooth or properly prepared graveled bituminous surfaces or to adhere multiple layers of acceptable insulation boards.

Approved insulations/coverboards– Wood fiber
– PUR/PIR insulation
– Polystyrene
– Mineral wool
– DensDeck Prime
Approved substrates– Structural concrete
– Plywood and OSB
– Steel
– Modified bitumen membranes and base sheets
– Approved insulations

Key Features and Benefits

Mechanical fastening of insulation or cover boards can be difficult and labor intensive in case of a concrete deck. Puncturing the vapor barrier is often not allowed in case of buildings with high interior humidity levels. Mechanical fastening of the insulation boards reduces the total R-value of the total roofing system because of cold bridging.

Using a PU adhesive eliminates the need for mechanical fasteners, eliminates cold bridging and thus allows, in some cases, to reduce the insulation thickness by 10 to 15% for the same R-value of the total roofing system.

The Firestone I.S.O. Twin Pack contains no solvents and sets in minutes. Application is quick and easy resulting in significant labor savings for the contractor. The adhesive can be applied using the handtool 'Twin Pack Hand Dispenser' or the semi-automatic 'Twin Pack Four Bead dispenser' for quicker installation.

Product Data

Each I.S.O. Twin Pack kit dispenses the mixed adhesive in a 12 mm wide bead. This bead will rise to 20-25 mm. Boards need to set in the adhesive before a skin coat develops. Set-up time varies between 5 and 15 minutes.

Coverage rates

  • Beads are installed 300 mm on center: 56 m² per carton
  • Beads are installed 150 mm on center: 28 m² per carton
  • Beads are installed 100 mm on center: 19 m² per carton

Bead spacing depends on the local wind uplift regulations and the type of board and substrate.

Please contact the Firestone Technical Department for further information on how to apply Firestone I.S.O. Twin Pack.

I.S.O. Twin Pack Insulation Adhesive Technical Information Sheet (TIS)
I.S.O. Twin Pack Insulation Adhesive Part A Safety Data Sheet (SDS)
I.S.O. Twin Pack Insulation Adhesive Part B Safety Data Sheet (SDS)

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