Galvanized metal or aluminum is considered the best to use for roof flashing.
How to use flashing on a roof.
Most flashing is 8 inches wide.
Recaulk the joints between the roof and the flashing.
Although roof flashing is occasionally fabricated from plastic roofing felt or rubber it is usually made of rust resistant metal galvanized steel aluminum or copper.
It is wise to choose flashing components that will have the same degree of longevity as the rest of your roof.
Use the metal break tool to bend the flashing lengthwise in the middle according to the angle of the roof joint.
Fasten loose nails and cover exposed nail heads with roofing cement.
Renew flashing seals by chipping out old caulking and mortar along the edges of the flashing.
4 inches should go up the house wall and 4 inches should go on top of the porch roof shingles.
Using proper flashing components and maintaining penetrations like skylights are critical to the performance of the roof as a system newer technology in flashings and roofing materials not to mention product performance levels has improved greatly in the last 20 years and flashing components need to be consistent with the new roof.
But it doesn t work that way.
What is roof flashing.
Use the best materials and overlap them in such a way that they shed water.
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.
Galvanized sheet metal is most common but aluminum and copper find occasional use in specialty situations.
Roofing cement can dry out and crumble away exposing joints to water.
Traditional roofing is quite simple.
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 chimneys and other building assemblies.
Once even a small section of roofing cement fails you ll have a leak.
Continuous flashing against a sidewall is one way to install a roof but it s not the correct way.