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

Afbeelding: Structaseal EPDM dakbedekking advies small

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.