Here s a look at some general principles of roof flashing that will help guide you through a proper repair or replacement or even new construction.
Proper roof flashing.
The first is called step flashing.
That lip is then set into a reglet or groove in this case cut into the mortar joint of the brick wall above.
Sections of l shaped sheet metal are woven into the shingle courses and lapped up the side of the chimney.
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.
Above the flashing lip the groove is sealed with mortar or with a sealant.
The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak.
Due to cohesion surface tension and other forces water droplets tend to stick to one another and to the surfaces they are on albeit slightly.
Direct water away from fascia.
A drip edge is designed to take advantage of those forces and along with gravity direct water into the gutter.
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.
Proper roof wall flashing example.
Aluminum flashing is very popular for do it yourself.
Drip edges have two key purposes.
While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately.
Open valleys have metal flashing to protect this critical area of the roof.
Galvanized sheet metal is most common but aluminum and copper find occasional use in specialty situations.
Roof sheathing underlayment roofing material roof intersections flashing details and ventilation.
And more often than not the culprit is the flashing the sheet metal that keeps the intersection between the chimney and roof watertight.
To install the roof wall flashing above the builder bent the top edge of the flashing into a 90 degree lip about 2 cm in width.
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.
