How to Apply Roll Roofing Over Existing Shingle Roofs Effectively and Efficiently

Installing Roll Roofing Over Shingles A Comprehensive Guide

When it comes to roofing, homeowners often grapple with choices related to materials and installation techniques. One popular option is roll roofing, which can be applied over existing shingles. This article will guide you through the steps, advantages, and considerations of installing roll roofing over shingles.

Understanding Roll Roofing

Roll roofing, often made from asphalt or mineral-surfaced materials, is a budget-friendly option that comes in long rolls and is typically used for low-slope roofs. Its lightweight nature and ease of installation make it attractive for many homeowners looking to refresh their roofs without undertaking a complete tear-off.

Why Install Roll Roofing Over Shingles?

1. Cost Efficiency Removing existing shingles can incur significant labor and disposal costs. Installing roll roofing over shingles allows homeowners to save on these expenses.

2. Time-Saving The project can often be completed in a single day, depending on the size of your roof, as there's no need for the time-consuming process of tearing off old shingles.

3. Added Layer of Protection By covering the existing shingles, you create an additional barrier against leaks and environmental damage.

4. Minimal Disruption Since the existing shingles remain intact, there’s less mess and disruption to your home during installation.

However, it is vital to recognize that installing roll roofing over shingles is not suitable for every situation. It’s essential to ensure that your existing roof is structurally sound and that there are no issues with leaks or water damage.

Steps to Install Roll Roofing Over Shingles

1. Inspect the Existing Roof Before you begin, thoroughly inspect your shingles. Look for any signs of damage such as curling, buckling, or missing shingles. If the roof is compromised, it may be better to remove the shingles first.

2. Gather Materials Equip yourself with the necessary materials, including roll roofing, roofing cement, a utility knife, roofing nails, and a hammer. You’ll also need tools for proper safety, such as gloves and safety goggles.

3. Prepare the Surface Clean the roof by removing any debris, dirt, or loose shingles. This step is crucial to ensure proper adhesion of the roll roofing.

4. Lay Down Underlayment While many opt to place roll roofing directly onto shingles, an underlayment can improve insulation and add extra protection against moisture. An appropriate underlayment material, like roofing felt, can be applied first.

5. Cut and Position the Roll Roofing unroll the roll roofing material and cut it to fit the dimensions of your roof. Start at the lower edge of the roof and work your way up, overlapping each subsequent strip by at least 3 inches.

6. Nail the Roofing in Place Secure the roll roofing into place with roofing nails, placing them every 6 to 8 inches along the edges and every 12 inches in the field of the material. Ensure that the nails are placed just below the seam to keep them concealed.

7. Seal the Edges Use roofing cement to seal the edges and any seams. This step is vital to prevent water from seeping under the material, which could lead to leaks and damage down the line.

8. Inspect the Finished Product After installation, inspect the roofing to ensure that everything is secured and that there are no visible gaps or exposed nails.

Considerations Before Installation

- Weight Load Ensure that your roofing structure can handle the additional weight of the roll roofing. In some cases, adding too much weight can lead to sagging or structural load issues.

- Local Building Codes Check with local building regulations regarding roofing to ensure that installing roll roofing over shingles is permitted. Some areas have specific codes in place regarding roofing materials and installation techniques.

- Professional Help If unsure about the condition of your existing roof or if the installation seems too daunting, consider hiring a professional roofing contractor. They can provide guidance, perform necessary inspections, and ensure a reliable installation.

Conclusion

Installing roll roofing over shingles can be a practical and economical choice for homeowners looking to extend the life of their roofs. By following the correct installation techniques and considering the underlying conditions of your existing shingles, you can successfully enhance your home’s roofing system while saving time and money. Always prioritize safety and compliance with local regulations to ensure a quality outcome.