9 Roofing System Components: Roofing Basics

What Are the Basic Roofing System Components?

Knowing the basics of a roofing system can be beneficial for homeowners. Even if you don’t plan on doing roof repairs on your own, it can be essential to know what your roof needs and when you should call a roofer out to your home. Identifying a problem early on can expand your roof’s lifespan and prevent more costly repairs.

What Is A Roofing System?

A roofing system is a group of components that work together to protect a building from the outside elements. Roofing systems are used for businesses, homes, and other types of buildings and structures. With a roofing system, people and their possessions are protected from rain, snow, wind, storms, and extreme temperatures.

Understanding the different components of a roofing system and how they work together can help homeowners make more informed decisions when it comes time for roof repair or replacing a damaged or old roof with a new one.

Roof Deck

The roof deck, also known as roof decking or roof sheathing, is the most fundamental component of the roof. You could consider it the bones of the entire structure. The roof deck is made of wooden framing (or plywood) and may be vulnerable to water damage or other structural threats.

Since it’s such a fundamental part of your overall roof’s structure, it’s essential to inspect the roof deck on a regular basis to ensure its integrity. Potential problems to look for include warping, rot, water damage, or soft spots on the deck’s surface. [1]

Roof Rafters

Roof rafters are beams that run across the peak of the roof to its eaves. Whereas the roof deck provides the base for the roof, the rafters provide the support structure. There are various types of roof rafters, depending on the home’s architectural style. Some examples include:

• Hip rafters
• Trussed rafter
• Valley rafters
• Compass rafters
• Curved rafter
• Balanced triangle rafter

Roof Underlayment

Directly above the roof deck is the roof underlayment. Since it protects the roof deck, it’s crucial that this layer of protection is waterproof and weather-resistant. Sometimes referred to as roof deck protection, the underlayment is typically made of synthetic material or asphalt-saturated felt. [2]

Storms can sometimes cause damage to the roof underlayment, so it’s a good idea to inspect it after the inclement weather passes. Even minor tears can expose the roof to costly damage and should be repaired promptly.

Roof Shingles

Once the underlayment is in place, the shingles can be installed. Most people are familiar with these parts of a roof, as they are the most visible and make up the central portion of the outer side of the roof. Shingles may be made of different materials, including asphalt shingles and composite shingles. Shingles are installed in layers to provide as much protection as necessary for the climate and conditions.

Roof Ridge

The roof ridge is the part of the roof that runs horizontally across the top-most part of the roof. This is sometimes called the roof’s peak. The roof ridge is protected by a special type of shingles known as hip and ridge shingles. [3]

Eaves

The part of the roof referred to as the eaves is the overlapping areas that run past the outer wall of the house. This provides additional support to the roof and can also prevent water damage and pest infiltration if appropriately maintained.

Roof Valleys

The part of the roof where the two slopes touch is referred to as a roof valley. Roof valleys serve the purpose of directing water off the roof. When installed correctly, this component of the roof protects it from leaks and water damage, thereby extending the roof’s lifespan. Valleys are often protected by roof flashing.

Roof Flashing

Roof flashing refers to the thin strips of metal placed around the roof’s most vulnerable features, such as the chimneys, valleys, joints, or vents. Roof flashing is installed to prevent water from infiltrating the roof. Proper installation is imperative to avoid costly water damage.

It could be essential to inspect flashing regularly, but especially after a storm. High winds can cause damage to the roof flashing, including cracks, tears, and loosening of the different sections of flashing. Any of these can compromise the watertight seals that protect your roof.

Roof Ventilation System

An essential part of the overall roofing system is a sub-system known as the roof ventilation system. This system comprises various components, including intake and outtake roof vents, which are responsible for controlling the temperature of the roof and preventing any moisture that builds up. A roof’s ventilation system can protect it from mold growth, ice dams, and other threats to the roof’s integrity.

Protecting Your Roof’s Components

Many variables can compromise the integrity of your roofing system. These may include harsh weather conditions such as wind-driven rain and heavy snow, as well as overhanging trees and pest infiltration. When you understand the different parts of a roof and their function, you can make informed decisions on how to best care for them, whether it’s a do-it-yourself job or one for a trusted roofing contractor.