Can You Install a Metal Roof Over Shingles? Here’s What to Know

Cost Savings: Installing a metal roof over shingles can save on labor costs and disposal fees, as there is no need for a full tear-off.

Faster Installation: Skipping the tear-off process reduces installation time, getting your roof completed quicker.

Enhanced Insulation: The existing shingles can provide an extra layer of insulation, improving energy efficiency.

Hidden Damage: Leaving old shingles in place could conceal underlying damage, like water leaks or rot, which can worsen over time.

Weight Considerations: Adding a metal roof over an existing shingle roof increases the total weight on your structure, which could affect your home’s structural integrity if not assessed correctly.

Potential Code Issues: Some local building codes may restrict the installation of a metal roof over existing shingles. Always check with a roofing specialist to ensure compliance.

Structural Integrity: A metal roof adds weight to your roof. While metal roofing itself is relatively lightweight, the cumulative weight of two roofing layers can be a problem if your structure isn’t built to handle it. A thorough inspection by a roofing specialist can determine if your roof can safely support a metal roof.

Fire Safety: Metal roofs are fire-resistant, which can improve the safety of your home. However, if the underlying shingles are compromised, this could pose a risk. Always ensure that the base is solid before installation.

Moisture Control: Proper ventilation is crucial when installing a metal roof over shingles. Trapped moisture between the two layers can lead to mold and rot. To prevent this, quality workmanship is required to ensure correct ventilation.

Inspection: Start by having a roofing specialist inspect your current shingle roof for damage. Any issues, such as leaks or rotting wood, must be addressed before installation.

Preparation: Install a protective underlayment over the shingles to serve as a moisture barrier. This step is crucial for preventing water damage between the shingles and the new metal roofing.

Metal Roof Installation: Begin installing the metal roofing panels. This process requires precision, as improperly installed panels can lead to leaks and other issues. Hiring experienced metal roofing services ensures the job is done right.

Metal Roof Over Shingles:

• • Average Cost: $15,000 to $25,000 depending on the size of the roof and the type of roofing material used.
  • Labor Costs: Lower since there’s no need for a tear-off.
  • Disposal Fees: Reduced or eliminated as old shingles are not removed.

Complete Tear-Off:

• • Average Cost: $18,000 to $30,000 for the same roof size.
  • Labor Costs: Higher due to the tear-off process.
  • Disposal Fees: Higher because of the removal of old shingles.

Budget Constraints: If you’re on a tight budget, installing metal roofing over shingles can reduce costs while still providing high-quality roofing solutions.

Time-Sensitive Projects: If you need your roof replaced quickly, skipping the tear-off step can speed up the project.

Strong Existing Roof: If your current shingle roof is in relatively good condition, and your home’s structure can support the added weight, installing metal over shingles can be a viable option.

Skipping the Inspection: Never skip a thorough inspection of the existing shingles. Even small issues can lead to significant problems down the line.

Poor Ventilation: Failing to install proper ventilation can trap moisture, leading to mold and rot between the two roofing layers.

Inadequate Fastening: Ensuring that metal panels are securely fastened is crucial to prevent leaks and potential damage in high winds.