Roof Flashing Under Shingles

Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls.

Roof flashing under shingles.

Fasten loose nails and cover exposed nail heads with roofing cement. Flashing should overlap the roof covering material but on asphalt shingle roofs for aesthetic reasons the part of the headwall flashing that extends down over asphalt shingles is often covered with a course of shingle tabs. Unfortunately it has deteriorated and needs to be replaced. The existing flashing is sheet lead and dates to 1910.

Roofing cement can dry out and crumble away exposing joints to water. With that type of flat edge flashing the shingles should have overlapped 2 additional courses until they reached the lower edge of the flashing or at least past the penetration of the roof sheathing. Step flashing is made up of each piece is slid under a shingle tab going up the roof. Step flashing protects the gap where roofs meet walls by weaving into the roof shingles.

As seen in m. Look for loose nails and any damage to the seals at the edges of the flashing. Flashing is installed to surround roof features such as vents chimneys and skylights. One common method is to lay the edge metal under the eaves membrane.

It looks like you re trying to do the flashing in one piece and that s asking for trouble. Nail the upper edges of the flashing to the roof sheathing where the shingles were removed with 6 penny. Also the flashing runs along the main part of the edge and extends about a 1. Don t mistake this condition for headwall flashing routed beneath the shingles and call it a defect.

The correct way to flash at the shingles in the area you indicated is using step flashing. This is what i like to see for square flashing there is a better circular flashing ecrofutt erby crofutt june 17 2009 1 55pm 7. The problem is that the old flashing is nailed to the roof under the shingles. Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer.

Flashing is generally installed at any joints or edges in the roof where water could otherwise work its way in. In order to properly install new flashing you ll have to remove the shingles surrounding your old flashing and then re lay them after installation. Typically flashing is installed using roofing nails and roofing cement. Always check the roof flashing and the condition of the shingles whenever you clean your gutters.