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10 Shocking Problems with Two Layers of Roofing Shingles!

Posted on : July 7, 2023

10 Shocking Problems with Two Layers of Roofing Shingles!

Are you thinking of adding a second layer of shingles to your roof? You should reconsider, there are a host of problems that await you. Double shingle roofs may seem like a quick and cost-effective solution, but they come with a host of problems you need to be aware of.

As a roofing specialist, I’ve seen a lot of damage occur when old roofs are covered with two or more shingle layers. To help you out, I’ll discuss the common, but serious problems you'll encounter with double-shingle roofs, exposing the risks and complications that can arise.

Double Trouble: The Dark Side of Two Layers of Shingles on Roofs

From permit predicaments to compromised warranties, let’s uncover the most common problems with double shingle roofs.

Permit Problems

One of the first challenges you'll face is obtaining the necessary permits. Many local authorities require permits for roofing projects, and failing to obtain them can lead to fines and legal consequences. Don't get caught up in red tape – make sure you have the proper permits before proceeding!

Building Code Backlash

Building codes are in place for a reason. They ensure the safety and structural integrity of buildings. A second shingle layer is permitted in some areas but has many terms and conditions related to the roof structure, old shingles, underlayment, and nailing. In most parts of the country, two or more roofing layers are not permitted, as they can exceed a roof’s weight limit and compromise its overall strength.

wo Layers of Roofing Shingles

Material Warranties Vanish

Manufacturer warranties are essential when it comes to protecting your investment in roofing materials. Most manufacturers even mention that their shingles need to be installed on a clean and repaired roof, right above the underlayment. Otherwise, it can void the warranties on both layers. This means that if any issues arise with any of the shingles, you won't be eligible for compensation.

Insurance Claim Issues

Filing insurance claims for properties with double-shingle roofs can be a nightmare for many homeowners. Most insurance companies do not approve claims for damage caused by two layers of asphalt shingles. That’s because it is not recommended by the professional roofing industry and is prohibited by many local building codes due to the increased risk of damage.

Roofing Disasters: Leaks and Rot

Putting two layers of asphalt shingles on your roof can make it prone to leaks, rot, and algae growth. The added weight and lack of proper ventilation can trap moisture, leading to the deterioration of the underlying materials. This moisture damage can result in wood rot, mold growth, and costly repairs.

Energy Efficiency Takes a Hit

Energy efficiency is a key consideration for homeowners, and double-shingle roofs can sabotage your efforts to save on energy costs. The extra roofing layer impedes proper insulation and ventilation, causing your home to be less energy-efficient. As a result, your utility bills may skyrocket, and you may experience discomfort due to inconsistent indoor temperatures.

Pest Infestation Perils

Double shingle roofs create an ideal environment for pests to infiltrate your home. The deteriorating condition caused by the additional shingle layer can create gaps and entry points for insects and rodents. Dealing with pest infestations can be both hazardous to your health and expensive to resolve. One of the easiest ways to protect your home from unwanted visitors is a single, sturdy roof. 

Fire Hazards Increase

Stuffing too much roofing material into a small space increases the risk of a roof fire. The accumulation of flammable materials between shingles, and the compromised fire resistance of older shingles, can create a dangerous situation. Protecting your safety and property should be a top priority.

Difficulty in Future Repairs

Roofs require maintenance and repairs over time, and having two layers of shingles makes these tasks more challenging and costly. When it's time for a new roof or repairs, removing multiple shingle layers becomes labor-intensive and expensive. So save yourself from the hassle and expense, and stick to one set of shingles. 

If you already have two layers of roofing shingles, it’s time to remove them before it gets out of hand. Your new roofing material should be installed on a clean, flat substrate for maximum comfort and durability. 

So let’s see how much the new roof will cost.

Cost to Tear Off Two Layers of Shingles

The price range for the removal and disposal of one or two shingle layers and underlayment is approximately $90 to $165 per square foot. It's essential to make informed decisions about your roofing projects and consult with professionals before proceeding.

If you are looking to replace your roof in Pittsburgh, Pennsylvania, with the best roof shingles, our team at McClellands Contracting and Roofing is here to help you.

Free Consultation and Estimate on Shingle Roof Replacement

Are you tired of dealing with a leaky, worn-out shingle roof? We're here to provide you with the ultimate solution to your roofing needs. With years of experience, we take pride in delivering flawless workmanship and 100% customer satisfaction. The team at McClellands Contracting and Roofing has been transforming Pennsylvania homes for years. We'll guide you every step of the way, ensuring your questions are answered and your concerns are addressed. Contact us at (412) 353-5660 to schedule a free consultation and estimate for your roof replacement in Pittsburgh, PA.

A. While technically possible, adding a metal roof over two layers of shingles is not recommended. It can exacerbate existing problems and compromise the metal roof's performance. So it's best to remove the old shingle layers before installing a metal roof for optimal results.

A. It depends on what the repair entails. If the repair job is to fix the top layer of shingles, it should be easy, but repair jobs for the underlayment or structure of the roof itself will be harder with two layers of shingles, and this is one of the main reasons that it’s not recommended.

A. Typically, you can expect the second shingle layer to endure for approximately five to ten years. Their durability can differ based on factors such as shingle quality and your local climate. Usually, these shingles have a shorter lifespan due to an increase in temperature between the two layers that cause the top layer to curl and crack more easily.

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