Fully Adhered Application
Once the substrate is properly prepared, the EPDM membrane can be laid out onto the roof and positioned. Make sure enough membrane overhangs the roof perimeters and upstands, allowing it to be trimmed later.
Applying adhesive to EPDM systems
Bonding of the membrane can now begin. Using a 9-inch roller, apply the water-based bonding adhesive to the timber substrate only.
The above method of application relates to a timber deck (plywood or OSB) only. For direct application to other surfaces e.g. polyisocyanurate insulation board or concrete, Firestone Bonding Adhesive must be applied to BOTH this substrate and to the back of the membrane. Allow it to become tacky to a finger touch. The membrane can then be applied to the substrate. Broom the membrane surface to ensure sufficient contact of the membrane with the substrate.
When applying the field sheet and a chimney or skylight is encountered, the membrane needs to be applied around this protrusion.
Measure the width and depth of the protrusion and transfer these dimensions onto the folded membrane. Draw an X inside the box.
Cut a straight line from the nearest edge of the membrane to one corner, then cut the X mark lines.
Roll the membrane around the protrusion, leaving a triangle of membrane that turns up all 4 sides.
These upstands can be adhered using Firestone Bonding Adhesive later on.
For fully adhered installations that are typically over 100 sq. m in area, base tie-in details are required for additional securement.
This procedure requires the addition if Reinforced Perimeter Fastening (RPF) strip, V-plates and All-Purpose fasteners to be attached at the upstand and perimeter edges.
For further details, please refer to the “Mechanically fixed application” section of the manual.
More guides from Permaroof
Permaroof UK Ltd offers support for EPDM application, whether for trade roofers or for the DIY market. The resource library contains an extensive range of EPDM installation guides in downloadable PDF format and video tutorials with step-by-step instructions given by qualified and experienced EPDM specialists.
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