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What Adhesive do I use when Bonding ClassicBond EPDM?

This article will help with choosing the correct adhesive for bonding EPDM to your roof deck

Full Answer

What Is The Correct Adhesive For My Roof Deck

In this article we will look at what roof deck surfaces CLASSICBOND EPDM can and cannot be bonded to and also the correct adhesives for the various roof surfaces that you might want to waterproof. 

This article is not intended as a definitive list so please contact us for further advice if you do not find the answer you are looking for. 


Bonding To Timber

Bonding EPDM to Timber

Bonding to Insulation

Bonding EPDM to Insulation

What Surfaces Can I Bond ClassicBond EPDM To?

ClassicBond EPDM is best bonded on to timber surfaces such as roofing grade plywood or OSB3 (Oriented Strand Board) sometimes called sterling board.  

ClassicBond can also be bonded to light weight concrete and other non porous surfaces such as Fibreglass and tissue faced insulation. 


What Surfaces Can Not 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. Care should be taken when removing the old Bitumous roofing membrane as it may leave a residue which can damage the EPDM membrane. We normally recommend overboarding old roof coverings using an OSB3 recovery board or insulation boards.


Old Felt Roof Upgraded to EPDM 2