• Chambersburg, PA & Surrounding Areas

Can You Install New Shingles Over Old Ones? An Expert Analysis

Introduction to Re-Roofing

In the realm of roofing solutions, homeowners often ponder whether installing new shingles over old ones is a viable option. This method, known as re-roofing, presents an attractive shortcut to the traditional and more labor-intensive process of tearing off old shingles before installing new ones.

Understanding the Basics of Shingle Layering

Shingle layering involves placing a new layer of shingles directly over the existing layer. This approach can offer several benefits, including reduced labor costs and a quicker installation process. However, it’s crucial to assess the condition of the existing roof structure and shingles to determine if this method is suitable.

Benefits of Layering Shingles

  • Cost Efficiency: By eliminating the need to remove the old shingles, homeowners can save on labor and disposal fees.
  • Time-Saving: The process is faster since it skips the tear-off phase, allowing for quicker project completion.
  • Added Insulation: An extra layer of shingles can provide additional insulation, potentially improving energy efficiency.

Considerations Before Layering

  • Roof Condition: The existing roof must be in good condition, without significant damage or sagging.
  • Weight: Additional shingles add weight to the roof structure. It’s essential to ensure the roof can support this extra load.
  • Local Building Codes: Some regions have specific regulations regarding shingle layering. Compliance is mandatory.

The Process of Installing New Shingles Over Old Ones

Initial Inspection

A thorough inspection by a professional roofing contractor is critical. This step assesses the viability of layering new shingles over the old ones, considering factors like the roof’s structural integrity and local building codes.

Choosing the Right Shingles

Selecting suitable shingles for the top layer is crucial. They should complement the existing roof’s aesthetics and performance characteristics. High-quality, durable shingles are recommended to maximize the roof’s lifespan and functionality.

Installation Techniques

Proper installation techniques are paramount to ensure the new layer of shingles adheres correctly and provides the intended protection. This includes:

  • Starter Shingles: Installing a new row of starter shingles at the roof’s edge to ensure a proper seal.
  • Nailing Pattern: Following the manufacturer’s recommended nailing pattern to secure the shingles effectively.
  • Flashing and Ventilation: Updating flashing around chimneys, vents, and valleys is crucial to prevent water infiltration.

Potential Drawbacks to Consider

While re-roofing offers several advantages, there are potential drawbacks:

  • Shorter Lifespan: The new shingles may not last as long as they would on a completely stripped roof.
  • Future Costs: If issues arise, future repairs may be more complicated and costly, as both layers would need to be removed.
  • Aesthetic Concerns: Layering can sometimes result in a less smooth appearance, affecting the roof’s aesthetic appeal.

Making the Right Decision

Homeowners should consult with a reputable roofing contractor, like Teflon Roofing located in Chambersburg PA, to evaluate their specific situation. A professional assessment can determine whether installing new shingles over old ones is the best course of action, considering the roof’s condition, local building codes, and the homeowner’s budget and preferences.


Layering new shingles over old ones can be a practical and cost-effective roofing solution under the right circumstances. However, it’s essential to make an informed decision based on a thorough inspection and professional advice. By considering the benefits, potential drawbacks, and proper installation techniques, homeowners can ensure their roofing project is successful and enhances their home’s protection and value.

Site Logo/Icon
  • Location

Chambersburg, PA 17201

  • Hours

Mon-Fri: 8AM - 5PM

Sat: 8AM - 12PM

  • Call Us

Contact Us Today

Copyright 2023 Teflon Roofing
Privacy Policy