It is a type of resistant moulding that prevents water flowing near roof openings from infiltrating the roof.
Parts of a houses roof.
A dormer is the entire structure consisting of wall and roof around the window.
Flashing is found in valleys and at the bases of chimneys walls roof vents and plumbing vents.
Names for specific areas of your roof.
A few definitions may make it easier for you to communicate with roofers.
Made of fibreglass and asphalt shingles protect the roof from rain and lend a house character.
Built up roof a low slope or flat seeming roof covered with alternating layers of roofing felt and hot mopped asphalt and topped off with a layer of gravel.
Dormers in some styles of houses dormers are popular as a way of protecting windows that protrude from a roof such as on the second floor of a home.
Also different architectural styles will use the same type of roof.
For more complete more eloquent detail about each house part or system click the links given by various house parts in this list.
Chimney used to vent flue gases from fireplaces or heating equipment.
Cornice the wood or metal finishing at ends or edges.
For brevity this list of house parts keyed to the illustration shown here is condensed to keywords and phrases.
The most common type of dormer is the gable roof dormer.