Can You Put New Shingles on Top of Old Ones?

Roofing projects are a significant investment for homeowners, and many consider ways to save money or time during the process. Can you put new shingles over old shingles without removing the existing roofing material? This practice, known as re-roofing or overlaying, offers certain advantages but also has potential drawbacks. This article will explore whether you can put new roofing over existing shingles, discussing the pros and cons and important considerations.

Pros of Overlaying New Shingles on Old Ones

1. Cost Savings: Overlaying shingle over shingles can be cost-effective as it eliminates the labor and disposal costs of tearing off the old roof. This can make roof replacement more affordable.
2. Time Efficiency: Re-roofing is usually quicker than a complete tear-off and replacement. This is especially advantageous if you need a speedy roofing solution due to weather-related issues or time constraints.
3. Reduced Disruption: Overlaying your roof reduces the disruption caused by a full tear-off, which involves loud noise, debris, and potential interior damage. This can be more convenient for homeowners.
4. Added Insulation: An extra layer of shingles can provide additional insulation to your home, potentially improving energy efficiency and reducing heating and cooling costs.

Cons of Overlaying New Shingles on Old Ones

1. Added Weight: The most significant drawback of overlaying new roofing over existing shingles is the added weight on your roof. This can place stress on the roof's structure, potentially leading to various issues.
2. Reduced Lifespan: New shingles adhere less effectively to old ones, which can reduce the roof's overall lifespan. This may necessitate more frequent roof replacements, ultimately costing you more money in the long run.
3. Concealing Damage: Overlaying old shingles can hide underlying issues, such as rot or water damage, making it challenging to detect and address these problems before they escalate.
4. Aesthetic Issues: Over time, the uneven surface created by layering shingles can lead to an unattractive appearance. This can affect your home's curb appeal and potentially lower its resale value.

Potential Problems with Overlaying Shingle Over Shingles

1. Roof Weight: Many building codes restrict the number of roofing layers that can be added. Exceeding these limits can strain your roof's structural integrity.
2. Moisture Trapping: Moisture can become trapped between the old and new shingles, leading to rot, mold growth, and other moisture-related problems.
3. Warranty Issues: Some roofing manufacturers may void their product warranty if you overlay new shingles on old ones. It is essential to check the terms of your shingle warranty before proceeding.
4. Building Code Compliance: Local building codes may restrict or prohibit overlaying new shingles. Non-compliance can result in fines and complications with insurance claims.

Factors to Consider

1. Current Roof Condition: The condition of your existing shingles should be assessed. If they are significantly damaged, deteriorated, or at the end of their lifespan, overlaying might not be advisable.
2. Weight Limitations: Have a roofing professional inspect your roof to ensure it can support the additional weight of another layer of shingles.
3. Building Codes: Check with your local building department to ensure that overlaying new shingles is allowed in your area and whether there are any restrictions on the number of layers.
4. Long-Term Goals: Consider your long-term plans for your home. If you intend to sell or keep your home for an extended period, your roof's durability and aesthetic aspects should be a priority.

Overlaying new shingles on top of old ones is possible, especially if you hire the right people. Still, it should be carefully considered after weighing the pros and cons and considering the specific conditions of your roofing situation. The drawbacks of added weight, reduced lifespan, and potential structural issues often outweigh the initial cost savings. Consulting with a roofing professional to evaluate your unique situation and make an informed decision is crucial.

Ultimately, investing in a proper roof replacement, when necessary, will provide greater peace of mind and long-term value for your home. While re-roofing can be a suitable option in some situations, it's important to make an informed choice that ensures the health and performance of your roof for years to come.

Contact Findlay Roofing today to schedule a consultation if you need a roof replacement.