ClassicBond EPDM - what substrate can I bond to?

January 30, 2018

So for a starter - What can ClassicBond EPDM be bonded to ?
ClassicBond EPDM is best bonded on to timber surfaces such as roofing grade plywood or OSB3 (Oriented Strand Board) sometimes called sterling board.  It can also be bonded to light weight concrete and other non porous surfaces such as Fibreglass and tissue faced insulation. 
Importantly - What Surfaces Cannot Be Bonded To?

ClassicBond EPDM can not be bonded to bitumous surfaces such as:

  • Roofing felt

  • Asphalt

  • Liquid mastics

The EPDM will tend to draw the oils out of the bitumous material which causes the EPDM to lose its molecular structure and fail.


As such care should be taken when removing the old Bitumous roofing membrane as it may leave a residue which can damage the EPDM membrane. Pragmatically and to ensure issue free installation RKD  recommend over boarding old roof coverings using an OSB3 recovery board or insulation boards.


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