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Can you Reroof over old shingles?

If you’re facing the need for a new roof, you might wonder whether you can save time and money by reroofing over the existing shingles rather than removing them entirely. While reroofing over old shingles is possible in some situations, it’s essential to understand the pros, cons, and potential implications of this approach before making a decision.

Pros of Reroofing Over Old Shingles:

1. Cost Savings: Reroofing over existing shingles typically costs less than a complete tear-off because it reduces labor and disposal costs associated with removing old materials.

2. Time Efficiency: The process of reroofing over old shingles is generally faster than a full tear-off, which can minimize disruption to your daily routine.

3. Less Mess: Reroofing avoids the messy and noisy process of tearing off old shingles, which can be advantageous if you want to maintain a cleaner and quieter environment during the roofing project.

4. Additional Insulation: An extra layer of shingles can provide some additional insulation to your home, potentially improving energy efficiency to a small extent.

Cons of Reroofing Over Old Shingles:

1. Weight: Adding another layer of shingles increases the weight of your roof. This can exceed the load capacity that your roof structure was designed to bear, potentially leading to structural issues over time.

2. Reduced Roof Lifespan: Reroofing over old shingles may shorten the lifespan of your new roof. Issues such as uneven surfaces, trapped moisture, and inadequate ventilation can accelerate deterioration.

3. Hidden Damage: By covering up old shingles, you may hide underlying issues such as water damage, rot, or defects in the roof decking. This can lead to more extensive and costly repairs down the road.

4. Aesthetics: Reroofing over old shingles can result in a less smooth appearance, especially if the old shingles are curling or uneven. This may affect the curb appeal of your home.

Considerations Before Reroofing Over Old Shingles:

1. Building Codes: Check local building codes and regulations. Some areas may prohibit reroofing over old shingles or have specific requirements regarding the number of layers allowed.

2. Condition of Existing Shingles: Evaluate the condition of the existing shingles. If they are severely damaged, curled, or cupped, reroofing over them may not be advisable as it can compromise the new roof’s integrity.

3. Roof Warranty: Manufacturers may void warranties if new shingles are installed over old ones. Ensure you understand the warranty implications before proceeding.

4. Consult a Professional: It’s crucial to consult with a professional roofing contractor. They can assess your roof’s condition, discuss your options, and provide expert recommendations based on your specific circumstances.


While reroofing over old shingles can offer cost and time savings initially, it’s essential to weigh the potential drawbacks and risks. In many cases, a complete tear-off allows for thorough inspection, and repairs to underlying issues, and ensures optimal performance and longevity of your new roof. Ultimately, the decision to re-proof over old shingles should be based on careful evaluation of your roof’s condition, local regulations, and guidance from experienced roofing professionals. Investing in a well-executed roofing project ensures your home remains protected and maintains its value for years to come.

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