A dormer is a structural projection from the main roof. It is usually gabled and typically has a window. The word dormer refers to the whole projection, not just the window.
The term drip edge is a piece of metal placed on the eave of a roof to help control and direct the flow of water from the roof. It protects the underlayment and eave facias.
The eave overhang is the part or edge of the roof that overhangs the building beyond its side-wall. Eaves help direct the flow of water off the roof and enhance climate control. “Gable (rake) overhang” performs a similar function at the endwall.
The fascia is a linear, vertical piece that covers the framing between the top of the roof and the soffit (underside) area of rake or eave overhangs.
Flashing is sheet metal that is used in waterproofing the perimeters and protrusions, valleys and other conjoining or intersecting areas of a roofing system.
The gable, also known as the rake, is the edge of the roof that runs from the eave to the ridge.
The pitch refers to the steepness or slope of a roof – the rise (height) in ratio to or “over” the run (length). A steep slope roof is generally any pitch that is greater than 3:12 or 3/12. (The roof rises three inches for every 12 inches of run).
The ridge is where the two roof slopes intersect or come together to form a horizontal junction line. It runs the length of the roof, separating the two opposite sides.
The valley is the water-carrying angle where two sloping planes of the roof meet.