Can I Put New Shingles Over Old Shingles?

Can I Put New Shingles Over Old Shingles?

Are you considering replacing your old shingles with new ones? It might seem like a convenient and cost-effective solution to install new shingles over the existing ones. However, before making this decision, it’s important to understand the potential drawbacks and why most roofing experts do not recommend this approach.

While it is technically possible to layer new shingles on top of old ones, there are several reasons why it is not the ideal solution. Firstly, existing bumps and indentations in the old shingles can telegraph through the new layer, making it difficult to properly secure the top layer. Additionally, roofing contractors need to inspect the condition of the existing roof, including the plywood, to ensure it is in good condition, which is not possible when shingling over existing shingles.

Another important factor to consider is that re-roofing can be more costly in the long run compared to replacing the entire roof. Problems with the foundation may arise and require expensive repairs, which can be avoided with a complete replacement. Moreover, installing new shingles over old ones prevents the proper installation of water and ice leak barriers, which are essential in certain climates.

Warranty concerns are also a reason why roof-over is not recommended. Manufacturers may void the warranty if new shingles are installed over old ones. Additionally, building codes may limit the number of roof layers allowed in certain areas. Lastly, re-roofing can decrease the resale value of a home and make it more difficult to sell, as prospective buyers may be deterred by the need to remove two layers of shingles in the future.

Key Takeaways:

  • Layering new shingles over old ones is possible but not recommended by roofing experts.
  • Roof-over can create difficulties in properly securing the top layer due to existing bumps and indentations in the old shingles.
  • Inspecting the condition of the existing roof is crucial for ensuring its integrity, which is not possible with a roof-over.
  • Re-roofing can be more costly in the long run as it may require expensive repairs and prevent proper installation of leak barriers.
  • Warranty concerns, building codes, and potential damage to resale value are other reasons to avoid installing new shingles over old ones.

Pros and Cons of Re-Roofing

Re-roofing, or placing new shingles over old ones, has its pros and cons that homeowners should carefully consider before making a decision.

The Advantages of Re-Roofing

One of the main advantages of re-roofing is the potential cost savings. By opting for a roof-over, homeowners can avoid the expenses and time-consuming process of tearing off the old shingles. This can be particularly appealing for those on a tight budget.

Another benefit of re-roofing is that the existing layer of shingles provides an additional layer of protection if the new roof is damaged by extreme weather conditions. This extra layer can help prevent water infiltration and further damage to the roof deck.

Some manufacturers retain the warranty on their roofing products used for re-roofing projects, as long as the work is done by a professional roofing contractor. This can provide homeowners with added peace of mind.

The Disadvantages of Re-Roofing

However, there are several disadvantages to consider when it comes to re-roofing. One major concern is the potential compromise to the structural integrity of the roof. The added weight of the second layer of shingles can strain the roofing structure and potentially lead to issues down the line.

Re-roofing does not allow for the complete revitalization of the roof. Without removing the old shingles, there is no opportunity to replace the underlayment, which can result in water damage and leaks in the future.

Furthermore, re-roofing can be more expensive in the long run. Homeowners may eventually need to remove two layers of shingles, which can increase disposal costs. Additionally, layering shingles creates uneven surfaces and can affect the installation and performance of the new shingles.

In summary, re-roofing can offer cost savings and some added protection, but it also comes with potential drawbacks such as compromised structural integrity and limited roof revitalization. Homeowners should carefully weigh these pros and cons before deciding whether re-roofing is the right choice for their home.

Advantages of Re-RoofingDisadvantages of Re-Roofing
Saves on tear-off expensesPotential compromise to roof structure
Provides additional layer of protectionNo opportunity to replace underlayment
Some manufacturers retain warrantyIncreased long-term costs

Note: The table above summarizes the advantages and disadvantages of re-roofing for easy reference.

Roof Replacement vs. Re-Roofing

When it comes to deciding between roof replacement and re-roofing, there are several important factors to consider. While re-roofing may seem like a cost-effective option at first glance, roof replacement offers numerous benefits that make it the preferred choice for long-term roof maintenance.

One of the primary advantages of roof replacement is the ability to tear off the old shingles and start fresh. By removing the old layers, homeowners and roofing contractors can thoroughly inspect the roof deck and underlayment, ensuring any underlying issues are addressed. This comprehensive inspection allows for a more accurate assessment of the roof’s condition and helps prevent future problems.

Another important benefit of roof replacement is the opportunity to install new water and ice leak barriers. These protective measures are essential for preventing water damage and leakage, especially in regions with harsh weather conditions. By replacing the entire roof, homeowners can ensure that these barriers are properly installed, providing added peace of mind.

While roof replacement may initially have a higher cost compared to re-roofing, it can ultimately be more cost-effective in the long run. By investing in a new roof, homeowners avoid the need to remove multiple layers of shingles in the future, saving on disposal fees. Additionally, roof replacement helps maintain the integrity and value of the home, as potential buyers will not be deterred by the prospect of removing multiple shingle layers.

FAQ

Can I put new shingles over old shingles?

While it is technically possible to do so with asphalt shingles, it is not recommended by most roofing experts.

What are the disadvantages of re-roofing?

Re-roofing can compromise the structural integrity of the roof, prevent proper inspection, increase disposal costs in the future, create uneven surfaces, and negatively impact the resale value of a home.

What are the advantages of roof replacement?

Roof replacement allows for a fresh start, complete inspection of the roof deck and underlayment, proper installation of water and ice leak barriers, and the potential to increase the resale value of a home.

Is roof replacement more cost-effective in the long run?

Yes, roof replacement may initially have a higher cost than re-roofing, but it can be more cost-effective by avoiding additional repairs and disposal fees in the future.

Why is roof replacement the recommended option?

Roof replacement ensures the longevity and performance of a roof, addresses underlying issues, provides proper installation of water and ice leak barriers, and maintains the integrity of a home.

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