Essential Components of a Roof Replacement
A roof replacement is more than just swapping out old shingles for new ones—it’s a complex process involving multiple layers and components that work together to protect your home.
Understanding these essential parts can help you make informed decisions, communicate effectively with your contractor, and ensure you’re getting a high-quality roofing system built to last. That’s where we come in.
For over a decade, Rescue My Roof has been a leading educator in the roofing industry. We’ve helped thousands of Wisconsin homeowners find their dream roofing solutions. Now, we’re here to help you, too.
In this article, we’ll break down the key components that make up a complete roof replacement. Ultimately, you’ll know exactly what’s going into your new roof.
10 Components of an Asphalt Roof
Asphalt roofing systems are popular among homeowners for a reason – they provide the ultimate protection for your home for a good price.
But the shingles aren’t your home’s only line of defense. Here are ten other essential materials going into your home’s roof replacement.
1. Roof Decking (Sheathing)
The roof decking is the foundation of your roofing system. It’s typically made of plywood or oriented strand board (OSB) and sits directly on the rafters.
If your existing decking is damaged or rotting, it will need to be repaired or replaced before new roofing materials are installed.
2. Underlayment
Underlayment is a moisture-resistant or waterproof barrier that goes between the decking and your shingles. It acts as a second line of defense against water infiltration, especially during storms or in areas where shingles may be compromised. There are two main types:
- Felt Underlayment: Traditional but less durable.
- Synthetic Underlayment: Lightweight, tear-resistant, and more durable overall.
3. Ice and Water Shield
This self-adhesive membrane is installed along the eaves, valleys, and around penetrations like chimneys or vents. It helps prevent water from backing up under shingles due to ice dams or heavy rain, which is especially important in colder climates like Wisconsin.
4. Flashing
Flashing is a thin piece of metal installed in joints, valleys, and around features like chimneys or skylights to direct water away from these vulnerable areas.
Damaged or missing flashing is a common cause of roof leaks, so it’s essential that it’s properly installed or replaced during a roof replacement.
5. Drip Edge
A drip edge is a metal strip installed along the edges of the roof to guide water into the gutters and away from the fascia and roof deck. It’s a small but vital component that helps prevent water damage and prolongs the life of your roof.
6. Ventilation
Proper attic ventilation is critical to a healthy roofing system. Without it, heat and moisture can build up in your attic, leading to mold growth, warped decking, and reduced shingle lifespan. Your contractor should evaluate your ventilation needs and install:
- Ridge vents
- Soffit vents
- Gable vents (if applicable)
7. Starter Shingles
Starter shingles are the first row of shingles installed at the roof’s edges. They provide an extra layer of protection against wind uplift and help create a watertight seal at the roof’s most vulnerable areas.
8. Shingles
The shingles are the most visible and protective part of your roof. Whether you choose asphalt, metal, or another material, they are your primary barrier against rain, wind, UV rays, and debris. Asphalt shingles remain the most popular choice due to their affordability and durability.
9. Ridge Cap Shingles
These are specially designed shingles that cover the peak (ridge) of your roof. They help seal the roof while also allowing hot, moist air to escape from the attic if ridge vents are used.
10. Gutters and Downspouts
While not technically part of the roof itself, your gutter system plays a critical role in channeling water away from your home. It’s a good idea to inspect or replace old gutters during a roof replacement to ensure proper drainage.
The Importance of a Complete Roofing System
Replacing your roof is a major investment—but it’s also an opportunity to upgrade your home’s protection and performance. By understanding the essential components of a roof replacement, you can ensure your contractor isn’t just replacing shingles, but delivering a complete system that will protect your home for years to come.
Learn more with “How Long Does A Roof Replacement Take: What to Expect” and “8 Factors Impacting Roof Replacement Costs (Planning & Budgeting).”
Are you in need of a roof replacement in southeastern Wisconsin? Rescue My Roof is ready to help. Contact us today to get a free estimate.
