Technical fact sheet no.
Roof to headwall flashing.
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.
The flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas.
Purpose to emphasize the importance of proper roof and deck flashing and to provide typical and enhanced flashing techniques for coastal homes.
The roofing contractors usually try to slide the roof flashing up behind lapped siding but many times this can be a chore and sometimes the exterior wall covering and or the existing water resistive barrier house wrap gets damaged in the process.
These don t bend well to accommodate roofs with steeper pitches and you ll often see gaps beneath the flashing.
Flashing is installed to surround roof features such as vents chimneys and skylights.
Roof to wall and deck to wall flashing.
Minimum of 2 with house wrap or other flashing and then covered with the finish wall cladding laps in the headwall flashing should be 3 minimum and the overlapping end set in a double bead of sealant.
The extra kick at the bottom of the face directs run off away from the structure.
Headwall flashing typically comes bent to 120 and can be fairly easily flattened for roofs with shallower pitches.
The metal flashing is formed with a hook edge and cleated on 12 centers.
Install gasketed fasteners approx.
Occasionally you ll see a roof which has had 90 sidewall flashing installed as headwall flashing.
On metal roofing systems a headwall flashing is designed to hook on the j channel or z channel and extend up behind the wall exterior while in shingle and slate roof the headwall sits on the first layer of roofing and is then covered by the second layer.
Flashing joints are lapped 6 in the direction of water flow.
23 roof to wall and deck to wall flashing home builder s guide to coastal construction page 1 of 3.
This drip edge flashing provides protection from water damage along the eaves and rake of a roof.
A headwall is defined by the junction between a sloped roof and a wall.
The flashing extends up the wall at least 4.
