Metal flashing called drip edge protects the edges of a roof from water damage. It forms a barrier to prevent water from seeping or blowing up under shingles and down the fascia or facing board and eventually causing rot or damage to the wood. Most drip edge is thin steel, bent at a 90-degree angle and usually with some lip or curl on the bottom of one edge to direct water away from the building, often into a gutter. It is usually installed before shingles are put on a roof.
Things You'll Need
- Tape measure
- Drip edge
- Tin snips
- Drip edge nails
- Roofing cement
Measure all roof edges with a tape measure. That is six on a traditional gable shed roof, one on each side and two on each end sloping to a peak. Buy enough edging to cover those areas; it typically comes in 10-foot lengths but can be cut with tin snips and overlapped for longer spans. Get appropriate nails, usually fairly short wide-headed styles, but follow recommendations of the drip edge supplier.
Start at the back of one side. Nail the flat surface of the drip edge to the roof with a hammer, with the bent side firmly against the fascia or trim board. Space nails about a foot apart; be sure one nail is right at each end of drip edge. If more than one strip is needed, overlap at least two inches from the front and nail through both pieces to the roof. Do both sides of the shed first.
Start at the bottom of one rake or slope side. Use tin snips to trim the bottom of the drip edge so the flat side goes over the flat side of the metal on the roof side to the edge of the roof and the bent side can be wrapped around the end to overlap edging on the side. Nail through both overlapped pieces. Install drip edge up to the roof peak. Overlap sections if needed from the top. Work up to the peak and trim the edge so the flat side stops at the peak and the bottom side extends past the peak to the roof top on the other side.
Do the other rake side the same way, working from the bottom to the peak. Trim the edge at the peak so the top half folds over the peak to go over the other side's flat edge. Trim the bottom so it goes to the top of the other drip edge. Nail both sides firmly right at the peak. Do the other gable the same way.
Tips & Warnings
- Run a bead of roof cement under the flat sides on the roof and caulk all overlaps and seams with clear caulk for extra protection.
- Use similar procedures on existing roofs, but put roofing cement on the flat part of the drip edge and slide it up under the shingles, then press the shingles down to secure the edge with the cement.
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