One of the essential components of a properly installed roof is the metal drip edge. Metal drip edge is a specially angled, galvanised flashing that is installed at all perimeter roof edges. Drip edge flashing supports the edge of the roofing material that extends beyond the roof surface and helps to channel the water run-off to prevent penetration that can lead to mould or rot damage in the roof structure. Metal drip edge is installed prior to the roofing felt and the procedure completes one of the necessary steps to a waterproof roof.
- Skill level:
- Moderately Easy
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Things you need
- Metal drip edge
- Metal snips
- 1-inch roofing nails
- Caulking gun
- Exterior-grade silicone caulking
Start the metal drip edge installation by laying the first full length over the lower edge of the roof, flush with the hip or gable corner, and secure the piece to the roof edge with roofing nails at roughly 8 inches spacing. Add an additional roofing nail approximately 2 inches from each end.
Secure the drip edge metal to the roof with roofing nails spaced approximately 12 inches apart and 4 inches from the end. This is the standard nailing pattern used for metal drip edge flashing.
Position the next piece of metal drip edge over the roof edge and lap the end over the previous section of drip edge flashing by 3 to 4 inches. Secure the piece in place using roofing nails following the standard nailing pattern.
Continue to install the drip edge flashing by repeating Steps 1 through 3 for all subsequent pieces being installed. Use tin snips to trim the length of the drip edge metal as needed. Metal drip edge flashing is also installed vertically at all gabled roof edges, if applicable, once the bottom overhang roof sections are completed.
Tips and warnings
- Add a continuous seam of silicone caulking in the lap joints between drip edge segments to maximise the waterproofing.
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