Lower Roof Flashing Detail

Step flashing protects the gap where roofs meet walls by weaving into the roof shingles.

Lower roof flashing detail.

Flashing joints are lapped 6 in the direction of water flow. It should tuck under the sheathing wrap above and over the flashing below. The cap flashing is set in the mortar joint between bricks. The pitch of the roof provides the gravity and the detailing provides the redirection.

If the lower roof abutting the building sidewall is being installed before the building s final wall siding and water membrane are being installed the building membrane roofing felt on the wall or final building siding may be able to serve as counter flashing atop the step flashing. Before installing the flashing bring the shingles up to the vent pipe. If installed along the foundation the membrane should cover the joint where the sill meets the foundation. Both the wall flashing and roof flashing should be fully adhered to the wall substrate.

Apply the wall flashing over the roof flashing and termination bar. 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. Roofing cad details and other resources. The metal flashing is formed with a hook edge and cleated on 12 centers.

Then cut a hole in the shingle that will. Apply a coping over the wall flashing and fasten with self tapping screws every 24 inches on center. Flashing is installed to surround roof features such as vents chimneys and skylights. A comprehensive roofing specification writing tool allowing users to quickly write accurate steep and low slope roofing specifications for job submittal packages.

However in low slope roofing systems it is easier for water to accumulate. The flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas. Fasten the wall flashing at the top of the wall every 6 inches on center. Rain should run off the roof and into the gutter.

This detail shows the use of copper cap flashing extending over copper base flashing at the intersection of a shed roof with a masonry wall. Ct 07 concrete or masonry wall base flashing with a 5 course flashing system. The flashing extends up the wall at least 4. Roof up to lower end of valley step flashing end shingles fitted and flashed against dormer under eaves practically all homes have circular vent pipes or ventilators projecting through the roof.

At the bottom of the roof water needs to be directed.