rolled roofing over shingles

Installing Rolled Roofing Over Shingles A Comprehensive Guide

Rolled roofing is a popular choice for many homeowners looking to re-roof their structures without the expense and time associated with traditional shingles. This option can save money and time while delivering a waterproof seal to protect your home. However, the idea of installing rolled roofing over existing shingles can raise concerns and questions. In this article, we will explore the practicality, benefits, and steps involved in placing rolled roofing over shingles.

Understanding Rolled Roofing

Rolled roofing is a type of roofing material made from asphalt, which comes in large rolls. This makes it easy to handle and install, especially on flat or low-slope roofs. It is often used in sheds, garages, and other outbuildings due to its affordability and durability. Rolled roofing typically comes in two varieties mineral-surfaced and smooth-surfaced. Depending on your needs, you can choose one that fits your aesthetic and functional requirements.

Checking the Condition of Existing Shingles

Before proceeding with installation, it is crucial to assess the condition of the existing shingles. If they are in good shape—meaning there are no severe cracks, curling, or significant water damage—you can move forward with laying down the rolled roofing. However, if the shingles are compromised, you should consider replacing them or repairing the damage before installation. Installing rolled roofing over problematic shingles can trap moisture and lead to further issues down the line.

Benefits of Installing Rolled Roofing Over Shingles

1. Cost-Effective One of the biggest advantages of applying rolled roofing over shingles is cost savings. You can avoid the expense of tearing off old shingles, thus reducing labor and disposal costs.

2. Time-Saving A rolled roofing application is generally quicker than a full re-shingle job. Homeowners can have their roofs completed in a fraction of the time, especially with minimal repairs to the existing shingles.

3. Weather Protection A properly installed rolled roofing system can provide further protection against water intrusion. Asphalt-based products are particularly effective in creating a waterproof layer that can help to divert water from your home.

4. Aesthetically Pleasing Options Many modern rolled roofing products come in various colors and styles that can enhance your property’s curb appeal.

If you decide to undertake this project yourself, here are the essential steps to follow

1. Gather Materials and Tools You will need rolled roofing, galvanized roofing nails, a utility knife, a roofing roller, and tar or adhesive.

2. Prepare the Surface Clean the roof by removing debris, dirt, and any loose shingles to ensure proper adhesion. Look for any damaged areas that may need repair.

3. Install Underlayment (Optional) While not strictly necessary, installing a layer of underlayment can provide an additional moisture barrier and improve the roofing system's longevity.

4. Measure and Cut the Rolled Roofing Measure the area to be covered and cut the rolled roofing material into manageable lengths, typically around 4-6 feet for easier handling.

5. Lay the First Sheet Position the first sheet of rolled roofing at the bottom edge of the slope, ensuring it overhangs slightly. Secure it in place with roofing nails, using the appropriate spacing suggested by the manufacturer.

6. Overlap and Secure Additional Sheets Continue to lay subsequent sheets, overlapping them by at least 4 inches. Use adhesive or roofing cement along the overlaps to prevent leaks.

7. Final Sealing Once the roofing is all laid out and secured, properly seal all edges and seams with roofing cement to create a watertight seal.

8. Maintain and Inspect Regularly Regular maintenance will extend the life of your rolled roofing. Check periodically for any damage, missing nails, or signs of moisture penetration.

Conclusion

Installing rolled roofing over shingles can be a practical solution for homeowners looking to save time and money while enhancing their roof’s protective properties. By assessing the condition of your shingles and following the installation steps outlined above, you can create a durable and visually appealing roofing system. Always remember to consult with local building codes and regulations, and consider seeking professional assistance if you’re not comfortable undertaking the project yourself. With the right preparations and care, your rolled roofing can provide reliable protection for many years to come.