Fitting Metal Edge Trim Detail in EPDM Roofing
In this guide, we will demonstrate the installation process for metal edge trim detailing on your EPDM roofing system. Edge trims help to complete the aesthetic and to seal and protect the gutter and kerb edges around the roofing, trapping the membrane securely and protecting it from the elements.
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How to Install the Metal Edge Trim System
Installation notes, please read first
Before membrane installation, attach some 2” x 1” timber batten to create a water check kerb at all perimeter edges except for the gutter edge of the roof.
Once the EPDM has been installed and the roof is watertight, it needs to be finished with metal edge trims. These are attached by mechanically fixing. The trims can be tailored with a sharp pair of tin snips.
It is important that any cutting tools used are sharp, as blunt tools will damage the trims, and consequently, the cosmetic finish of the roof will appear unprofessional. Care needs to be taken when handling the trims, as some cut edges are sharp and therefore a risk of damage to the membrane exists. It is good practice to radius the cut edges to take off the sharp point.
Step 1
The membrane will be attached to the perimeter edges with bonding adhesive.
Step 2
At the gutter edge, excess membrane needs to be trimmed off. Mark the membrane with the blunt edge of the scissors against the gutter (usually 100-150mm from the roof edge) and cut away the excess. The remaining membrane will fall naturally into the
gutter at the correct length.
Step 3
An excess of membrane at the gutter edge corners needs to be tidied up and secured. This excess can be folded around and glued or attached to the side of the roof edge with a hammer tacker or staple gun.
Step 4
Use the tin snips to cut the trims to size. For corner details, cut the top edge and also a V-shape in the trough at the bottom edge of the trim.
Step 5
Bend the trims around the required angle.
Step 6
Butyl sealing tape needs to be applied to the underside of the trims at the fixing points to waterproof the fixing penetration.
Step 7
50mm x 25mm of tape is adequate for each fixing. The fixing points are evenly distributed and are generally 600mm apart. Apply the tape to the underside as shown, and peel off the backing paper.
Step 8
Tech screws are used for attaching the trim. These screws cut through the trim, the butyl sealing tape and into the batten with no pilot holes required. Offer the trim to the desired position on the edge and fix with a cordless screwdriver.
Continue until completed.
More guides from PermaRoof UK
PermaRoof UK offers support to both trade and DIY for EPDM application. We provide a further range of installation guides, datasheets, product and technical information in the Knowledge Base and in our corporate resource library here.
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