MISSISSIPPI: Central (601) 647-3433 North (662) 339-8861 Coastal (228) 207-1398 ALABAMA: (251) 929-4538 LOUISIANA: (985) 590-6796

Storm Damage? We Can Help! Learn More About Our Emergency Storm Services & Call Now For Relief.

What Are Some Common Problems With Having Two Layers Of Shingles On Your Roof?

Posted on January 15, 2025

What Are Some Common Problems With Having Two Layers Of Shingles On Your Roof?

As a homeowner have you ever thought about adding a second layer of shingles to your roof as a way to save time and money? While it might seem to be the quicker and cost-effective solution for your roofing needs, this approach creates some massive problems for your home in the future. 

In this blog post, we’ll explore the common issues that pop up when you’re handling two layers of shingles on your roof so you decide whether this is the right choice for your home.

How Many Layers Of Shingles Can You Have​?

Two Layer Shingles 1

Most building codes allow up to two layers of shingles on a roof, especially for asphalt shingles, which are the most common on residential homes. If your roof already has two layers, a full tear-off is usually needed for any new installation. Adding extra layers can cause structural problems because it adds to the overall weight, making it harder to check for underlying damage. It’s a good idea to consult a professional roofing contractor during this time in order to find the best solution for your roof.

Problems With Two Layers Of Shingles On Your Roof

In order to understand whether this choice is right for your or not, let’s break down some serious issues caused by two layers of shingles:

1. Too Much Weight

One of the biggest concerns is the extra weight on your roof. Most roofs are designed to support only a single layer of shingles, and adding another layer can significantly increase the load. Over time, this added weight can cause sagging or structural damage. In areas with heavy snow or rainfall, the risk of collapse becomes even greater due to the combined pressure of the weather and the amount of shingles.

2. Hard to Find Leaks

Adding a layer doesn’t just impact the roof’s structure, it also makes maintenance trickier. With two layers, identifying and repairing leaks becomes a real challenge. Water seeps through the top layer and travels in unexpected ways underneath, making it difficult to locate the source. This causes repair bills to be higher and more extensive if the issue isn’t caught early.

3. Bad Ventilation

Proper ventilation is critical for a healthy roof, and adding a second layer can disrupt airflow. Without good ventilation, heat and moisture become trapped, leading to mold growth and further structural damage. Over time, this trapped moisture significantly shortens the lifespan of your roof.

4. Pest Problems

The gaps that form between two layers of shingles create an inviting space for pests like insects and rodents. As the roof deteriorates, these gaps become larger, making it easier for pests to enter your home. Along with structural issues, this can lead to health risks and expensive extermination efforts.

5. Fire Risks

Adding a second layer of shingles increases the risk of fire. Debris and older, less fire-resistant shingles, trapped between the layers create a hazardous environment full of flammable material that can suddenly ignite when flames are nearby  

6. No Warranty Coverage

Another drawback is that many manufacturer warranties won’t cover roofs with two layers of shingles. This means homeowners end up facing out-of-pocket expenses for repairs or replacements that would have been covered if the roof had a single layer.

7. Difficulty Matching Shingle Styles

When repairs are needed, it can be tough to find matching shingles for the top layer. Older styles or colors may no longer be available, resulting in mismatched shingles that can impact your home’s appearance.

4. Higher Risk of Wind Damage

Having two layers of shingles on your roof can make it more vulnerable to wind damage. The added weight and potential for loose shingles may cause the top layer to lift or dislodge in strong winds, exposing the lower layer and increasing the risk of leaks and expensive repairs.

How To Identify Two Layers Of Shingles On A Roof​

If you want to figure out whether there are two layers of shingles on your roof, just simply start by inspecting the edges. Use a ladder to get a closer look, and if the edges appear unusually thick or have a lumpy texture, it could indicate that multiple layers are present. 

Next, check areas around vents or chimneys for any signs of waviness, as this can also hint at an extra layer beneath the surface. If you’re still uncertain, gently lift a corner of the top shingle to see if another layer lies underneath. 

For a more accurate assessment, consulting a professional roofer is always a reliable option.

Other Alternatives To Two Layers Of Shingles

Make the right choice for your roof by choosing these options instead of adding an additional layer to a shingle roof​:

1. Complete Roof Replacement

Complete Roof Replacement 1 1

Instead of layering shingles, consider removing the old shingles entirely and installing a brand-new roof. This method not only provides a fresh start, it also ensures that any hidden issues, such as rot or structural damage, are addressed. By starting with a clean slate, you create a solid foundation for your new roofing materials, improving durability and long-term performance.

2. Professional Consultation

Before making any decisions about layering shingles, it’s essential to consult a roofing professional. They can thoroughly assess the condition of your roof and identify potential issues that might go unnoticed. With expert guidance, you can choose the best solution to maintain your roof’s integrity, safety, and longevity.

Is It Legal To Install Two Layers Of Shingles?

While installing two layers of shingles is allowed in many areas, it’s often discouraged due to the issues that we addressed earlier in this article.  

You may even face fines from your town or city if the local building codes prevent the use of two layers of shingles on a roof. This is why roofing professionals typically recommend removing the old layer before installing new shingles to ensure proper ventilation and long-term durability. 

Cost To Tear Off Two Layers Of Shingles​

Removing two layers of shingles usually ranges from $110 to $160 per 100 square feet, including removal and disposal fees. For a more accurate estimate, consult with a roofing professional.

Get Expert Roofing Services With Renova Roofing & Construction!

While adding a second layer of shingles may seem quick and affordable, it’s important to know that the potential problems outweigh the benefits. The reduced lifespan, higher risk of leaks, added weight, and voided warranties can lead to expensive repairs and structural damage. A proper tear-off and replacement is the best way to protect your home and ensure a long-lasting, reliable roof.

Is your roof suffering because of two layers of shingles? Don’t worry, Renova Roofing & Construction is here to help you with expert roof replacement services. We know the risks of having extra layers, including moisture buildup, early damage, and strain on your structure. Our team will take care of the tear-off and replacement, ensuring a proper installation and a lasting roof. To get the best roofing services, call us today at (601) 647-3433!