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  • Gina Reed

The Anatomy of a Roof: Part 1

Updated: Aug 15, 2023



1. Roof Ridge:

The roof ridge, or ridge of a roof is the horizontal line running the length of the roof where the two roof planes meet. This intersection creates the highest point on a roof, sometimes referred to as the peak. Hip and ridge shingles are specifically designed for this part of a roof.

2. Ridge vent:

A ridge vent is an exhaust vent that runs horizontally along the peak of the roof allowing warm, humid air to escape from the attic.

3. Flashing:

Flashing is a metal material installed at joint openings, around chimneys, and any dormer windows or skylights to help prevent water intrusion. You may recognize flashing as metal stair steps alongside a chimney or side walls on a roof.

4. Hip:

The hip on a roof is the intersection of two roof planes that meet to form a sloping ridge running from the peak to the eave. Hip and ridge shingles are specifically designed for this part of a roof.

5. Roof Deck:

The roof deck is the structural foundation base for the roof system and is usually made of wood or plywood.

6. Roofing Underlayment:

Roofing underlayment is a layer of material, usually synthetic or felt, that adds extra protection on top of the roof deck and under the shingles. Synthetic underlayment helps repel moisture and provides protection against water infiltration. Synthetic underlayment is becoming a popular material choice over felt due to proven water-resistance performance and long-lasting durability.

7. Roof Valley:

The roof valley is the V-shaped intersection between two sloping roofs joining at an angle to provide water runoff.


If you have questions about your roof or would like a free roof evaluation,

give us a call at 503-395-ROOF (7663) or contact us below.

We can't wait to hear from you!




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