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Roof 101: Your Pictorial Guide To The 19 Essential Parts Of A Roof

Posted on November 26, 2023

roof parts

As homeowners, we often take our roofs for granted. We assume that it will protect us and keep us safe and dry. However, understanding the structure and parts that make up a roofing system is essential to ensure longevity and effectiveness.

A roof is the uppermost part of a home that protects it from the elements, including rain, snow, wind, and sunlight. Knowing different parts of a roof will help you in the long run of homeownership. It allows you to make informed decisions if your roof is compromised, or you are looking to get a new one. 

Though a roof can utilize different roofing materials, today we’ll just be addressing the most common type of roof and its parts: the shingle roof. 

19 Essential Parts Of A Roof You Need To Know

A roof is an essential part of any building, and it is crucial to understand its components for proper maintenance and repair. Here are 19 essential parts of a roof that you need to know about:

1. Trusses

Trusses are the prefabricated metal or wood components that comprise the framing of the roof and bear the weight of all roofing components. They are designed to distribute the roof’s weight evenly and provide structural support through a web-like design. They are lightweight yet strong enough to support the weight of the roof and any additional loads, such as snow or wind. They tend to be prefabricated off-site and delivered to the construction site in one unit. 

2. Rafters

Rafters support the roof’s weight and transfer it to the walls of a building. They are sloping beams that run from the roof’s ridge to the eaves. Rafters are typically made of wood and are installed at regular intervals to form the roof’s frame. They are designed to distribute the weight of the roof evenly and provide structural support.

Rafters and Trusses
Rafters and Trusses

3. Roof Deck

A roof deck is the foundation of your roof. It is the flat surface that supports the roofing materials and provides a base for the other components to be installed. The roof deck is typically made of wood, plywood, or oriented strand board (OSB). It is essential to ensure that the roof deck is in good condition before installing any roofing materials. 

OSB Roof Deck
OSB Roof Deck

4. Ice and Water Shield

Installed on top of the roof deck, before the underlayment, an ice and water shield is a self-adhesive barrier that should be placed in areas prone to water infiltration and ice dams. Its main purpose is to keep water from reaching the roof deck so that the interior of the house is not harmed. Usually, rubberized asphalt or synthetic materials are used to create the ice and water shield. Some roofing systems may not have an ice and water shield, though they should always have underlayment. 

5. Underlayment

Underlayment is the layer of material placed over the ice and water shield and beneath the roofing materials. Its primary objective is to provide an additional line of defense against water damage. Felt or synthetic materials like polyester or polypropylene are commonly used as underlayment materials. Ensure the underlayment is installed correctly to prevent water from seeping through the roof deck.


6. Starter Shingles

Starter shingles are materials that are installed along the eaves of the roof to provide a base for the other roofing materials. Their primary function is to prevent water from seeping under the roofing materials. Starter shingles are typically made of asphalt or synthetic materials.

7. Roof Shingles

Roof shingles are the primary roofing materials that are installed on the roof deck. They are typically made of asphalt, wood, metal, or clay tiles. To blend in with the home’s architectural design, roof shingles are available in a variety of colors, designs, and textures.

Roof Shingles
Roof Shingles

8. Hip and Ridge Shingles

Hip and ridge shingles are materials that are installed along the hips and ridges of the roof to provide a finished look and to protect the roof from wind and water damage. 

9. Roof Vents

Roof vents are a vital component of any roofing system because they let hot and stale air escape through the attic, assisting in the control of humidity and temperature. Aside from preventing ice dams, proper ventilation can also prolong the life of other parts of the roof. There are two types of ventilation: intake vents and exhaust vents. Intake vents are typically installed along the eaves of the roof, while exhaust vents are installed along the ridge.

10. Ridge Cap Shingles

Ridge cap shingles are specially made shingles that are installed along the ridge of the roof to provide a finished look, and to prevent water from seeping through the ventilation system, protecting the rest of the roof from wind and water damage. 

Hip and Ridge Shingles
Hip and Ridge Shingles

11. Overhangs

The portions of a roof that protrude past a building’s outer walls are known as overhangs. Overhangs provide shade, channel rainwater runoff, and protect the home’s siding and windows from rain and snow damage. 

Roof Overhangs

12. Roof Eaves

Roof eaves are the lowest edge of the overhang. They protect the exterior siding from water damage and offer visual impact. Eaves consist of soffits and fascia, which work to provide ventilation and gutter support.

13. Drip Edge

A drip edge is a piece of roofing material that is installed along the eaves of the roof to prevent water from leaking through the material. It is made of metal and its primary function is to direct water away from the fascia and into the gutters. The drip edge is typically made of aluminum or galvanized steel.

14. Fascia

The fascia is the part of the roof that is installed along the eaves to provide a finished look and to protect the roof from water damage. Its primary function is to support the gutters and to prevent water from seeping behind the roofing materials. You can find fascias typically made of wood, aluminum, or PVC.

15. Soffit

A soffit is a part of the roof that’s located on the underside of the eaves. They can be utilized to provide ventilation and prevent water from seeping under the roofing materials. Its primary function is to allow for the circulation of air through the attic space. You can find soffits typically made of wood, aluminum, or PVC.


16. Gutters

Installed along the fascia, gutters serve as channels that gather and divert rainwater away from buildings. They are typically made of aluminum, copper, or galvanized steel. Gutters come in a variety of sizes and styles to match the architectural style of the property.

17. Downspouts

Downspouts are pipes connected to the gutters to direct rainwater away from the foundation of a building. They are typically made of aluminum, copper, or PVC. Downspouts can be found in a range of sizes and designs to complement a home’s architectural style.

Gutters and Downspout
Gutters and Downspout

18. Flashing

To stop water from leaking through vulnerable areas on the roof, flashing is a material that is installed around roof penetrations like vents, skylights, and chimneys. Its primary function is to direct water away from these areas and into the gutters. Usually, flashing is made up of copper, aluminum, or galvanized steel.

19. Roof Trim

Roof trim is an essential part of a roof that provides a finished look to the roof’s edges. It is installed along the roof’s perimeter and is used to cover the fascia board. The trim is available in various materials, including wood, vinyl, and metal. The primary function of roof trim is to protect the roof’s edges from water damage and to prevent pests from entering the roof. The trim also enhances the roof’s aesthetic appeal and can be used to complement the home’s exterior design.

Understanding The Necessary Parts Of A Roof

A solid and well-maintained roof is vital for the protection of any structure. A roof is a framework designed to protect a structure from the weather and preserve its structural integrity.

Here are some reasons why understanding the necessary parts of a roof is important:

  • Protection: Keeping a building and its occupants safe from the weather is the main purpose of a roof. The various parts mentioned in this article work together to create a sturdy and functional roof that can withstand harsh weather conditions.
  • Structural Integrity: A roof is an integral part of any home as it protects the interior from the elements 24/7. The various parts of a roof, such as trusses, rafters, and decking, provide the framework and support for the roof structure.
  • Insulation: Insulation is a key part of your roof that helps keep your home warm in winter and cool in summer. It’s usually placed under the roof materials or in the attic, helping make your home more energy-efficient.
  • Aesthetic Appeal: Roofing materials, such as shingles, tiles, and metal, provide aesthetic appeal to a home. They come in a variety of colors and styles, allowing homeowners to choose a look that complements the style they want for their home.

In order to ensure appropriate maintenance and efficient repairs, home and building owners must be informed about the different roof parts. The durability and lifespan of a roofing system depends on well-maintained parts of the roof to ensure they all work together efficiently to form a resilient, weather-resistant structure.


Knowing the various parts of a roof is essential for ensuring a functional roofing system. In this blog post, we covered 19 essential parts of your roof, and with this, we encourage readers to take care of their roofs and seek professional help when needed. Regular inspections and appropriate maintenance can extend the life of your roof and prevent costly repairs.

Need Expert Advice On Your Roofing System? Count On Us!

At Prestige Roofing LLC, we make the repair, replacement, or installation of a new roof easy for you. With more than 50 years of experience and a lot of successful roofing projects, we know what it takes to ensure that every part of your roof is in good condition, and how to repair it if not. 

Regardless if it’s a minor fix or a significant change to your roof, we aim to help our customers understand their roofing needs. Do you want to check the condition of your roof? Call us at (920) 791-0414 for a free roof inspection today in De Pere, and the surrounding areas of Wisconsin. 


A. The parts of a roof serve different purposes, such as providing structural support, insulation, ventilation, and protection against the elements. 

A. Some common roof parts include shingles, underlayment, flashing, gutters, downspouts, vents, and skylights.

A. Some typical materials used for roof parts include asphalt, metal, tile, wood, and slate. 

A. A drip edge is a type of metal flashing put in place along the roof’s edge to stop water from getting back behind the roofing materials. Instead, it helps guide the water into the gutters. Benefits of using a drip edge include improved water resistance, increased durability, and reduced risk of damage to the roof deck. 

A. A flat roof consists of four main components: 

  • Roof Deck: The structural surface that supports the roof’s weight, typically made of steel, concrete, or wood.
  • Roof Insulation: Added to provide thermal insulation, reducing heat loss and gain.
  • Substrate: A layer that separates the insulation from the roof membrane, usually made of plywood or composite materials.
  • Membrane: The waterproofing layer that protects the roof from water damage, made of materials like tar, asphalt, rubber, or fiberglass.