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Installing STRUCTASEAL® EPDM roofing to insulation boards

For bonding STRUCTASEAL® EPDM roofing on an insulated roof construction, we distinguish between the adhesion of the central roof surface and the edges and upstands. To prevent physical building problems a vapour barrier must be installed under the insulation boards. STRUCTASEAL® EPDM roofing can only be adhered to tissue faced insulation boards. For optimal adhesion of the roof surface STRUCTASEAL® PU Bonding Adhesive is used.

Regardless of the surface or height of the roof, the edges and upstands must always be bonded with STRUCTASEAL® Contact Adhesive. The SPRAYBOND variant provides an optimal ease of installation option.

Download our installation guidelines

Installation instructions

The surface must be flat, clean, grease-free and dry. For optimal adhesion, walk through the following points step by step:

Bonding to the roof surface:

  • Mark 150 mm from the roof edge using a chalk line.
  • Determine the correct position on the roof based on the supplied roll-out sketch.
  • Fully unfold the EPDM roofing membrane and drop over the roof edge.
  • Half fold the EPDM membrane across the roof.
  • Apply the Bonding Adhesive PU over the insulation boards by means of the pouring spout (apart from the 150 mm marked area and the upstands).
  • Spread the adhesive evenly over the surface of the insulation boards with a fleece roller. (apart from the 150 mm marked area and the upstands).
  • Depending on the temperature, wind and humidity, leave the adhesive for 5 to 20 minutes to allow the solvents to evaporate.
  • Roll the EPDM back into the adhesive.
  • Brush the EPDM membrane lightly with a soft broom. Repeat the above steps for the other half of the roof surface.


Edge fixation

  • Apply SPRAYBOND CONTACT ADHESIVE to the remaining 150 mm of the roof surface and the raised edges.
  • When the contact adhesive is touch dry, bond the EPDM bond securely without air pockets. Always work from the middle to the sides. Use a flat hand to wipe the EPDM into the surface and against the upstands. 
  • Roll the EPDM with a silicone compression roller.







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