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Roof Flashing Techniques for Outside Corners: Step-by-Step Instructions and Pictures

Use soldered corners or special bent pieces of galvanized flashing to make leakproof dormer and chimney corners. Read an overview of roof flashing techniques for outside corners.

Roof Flashing Techniques for Outside Corners-Step 1
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Method 1: Wrapped Corner
1. Run the base flashing 4 to 5 in. beyond the dormer and cut the top section along the dormer edge. Bend the flap down and nail along the top edge.


Roof Flashing Techniques for Outside Corners-Step 2
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Method 1: Wrapped Corner
2. Notch the first step flashing, leaving a 1-in. flap to bend around the front of the dormer. Nail along its upper edge. Add shingles and additional step flashing.


Roof Flashing Techniques for Outside Corners-Step 3
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Method 1: Wrapped Corner
3. Squeeze a thin bead of caulk over the leftover gap and along the bottom joint.


Roof Flashing Techniques for Outside Corners-Step 4
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Method 2: Soldered Corner
Lay soldered corner flashing around the corner and over the base flashing. Nail the flashing to the dormer near the top edge and continue with the shingles and step flashing.


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