Roll roofing is among the most affordable and easy-to-install roofing options, making it a popular choice for low-slope roofs in residential settings, garages, sheds, and outbuildings. Though it may not offer the same lifespan as more advanced roofing materials, roll roofing can be an ideal solution when installed correctly. This comprehensive guide will walk you through every essential detail—from preparation to final installation—to ensure your roll roofing project is a success.
This article covers each installation step in detail, with added tips, FAQs, and best practices to achieve a high-quality finish.
Why Roll Roofing? A Look at Its Benefits and Ideal Applications
Roll roofing provides a practical solution for flat or low-slope roofs, offering a simple, cost-effective way to protect a structure from water damage. Whether you’re a DIY homeowner or a professional roofer, roll roofing has a straightforward installation process that makes it an accessible option.
Benefits of Roll Roofing:
- Affordable: Roll roofing is much cheaper than traditional shingles or metal roofing.
- Quick Installation: Comes in large rolls that reduce installation time.
- Ideal for Low-Slope Roofs: Perfect for structures with low slopes where shingles may not be effective.
- Durable for Smaller Structures: Works well for garages, sheds, barns, and other outbuildings.
Roll roofing may not have the lifespan of metal or rubber roofs, but it provides a reliable solution for buildings where budget and simplicity are top priorities. To learn more about flat roof options, see this comprehensive guide on roofing.
Roll Roofing Options: Traditional Asphalt vs. SBS Modified Roofing
There are two primary types of roll roofing materials available, each with unique characteristics to consider:
- Traditional Asphalt Roll Roofing: Made from asphalt-saturated organic felt or fiberglass and topped with mineral granules. It provides a reliable and budget-friendly choice for homeowners seeking basic protection.
- SBS Modified Asphalt Roll Roofing: Made from a synthetic rubber (Styrene Butadiene Styrene) blend, this type of roll roofing is more flexible and durable, adapting well to temperature changes and weather extremes.
Choosing the right type depends on your climate, budget, and the specific requirements of the roof. For areas prone to temperature fluctuations, SBS modified roll roofing offers enhanced flexibility and resilience.
Tools and Materials: Setting Up for Success
Before beginning your project, gather the essential materials and tools needed for the installation:
- Roll Roofing Material: Choose either asphalt or SBS modified roofing for the best results based on your roof’s needs.
- Underlayment: A 15-pound felt underlayment layer will provide added water resistance.
- Roofing Nails: Opt for galvanized nails to prevent rusting and ensure long-term durability.
- Roofing Cement: Necessary for sealing edges and seams to keep water out.
- Utility Knife: To cut roll roofing to size with precision.
- Chalk Line: A chalk line ensures straight, evenly spaced rows.
- Measuring Tape: Essential for taking accurate measurements and cutting the roofing material accordingly.
- Hammer: For nailing the roofing into place.
Properly preparing these materials will make the installation process smoother and faster, ensuring each step is executed correctly.
Installation Steps: How to Install Roll Roofing for Lasting Results
Step 1: Clean and Prepare the Roof Surface
Begin by thoroughly cleaning the roof deck. Remove any dirt, debris, old nails, or other imperfections that might interfere with a smooth installation.
- Clear the Roof Deck: Sweep away any loose materials and inspect for damage. Level any uneven areas with shims or fillers to avoid water pooling on the finished roof.
- Lay the Underlayment: Roll out a 15-pound felt underlayment over the roof deck to add an extra layer of water resistance.
- Install Flashing and Drip Edges: Install flashing around the roof’s edges, chimneys, or other areas prone to leakage. Place drip edges along the eaves and rakes to direct water off the roof.
Pro Tip: For the best results, install roll roofing on a dry, clear day with temperatures above 50°F. Wet or cold conditions can make installation more difficult and affect the adhesive quality of the roofing cement.
Step 2: Measure and Cut the Roll Roofing
Measuring and cutting the roll roofing accurately is essential for creating a professional look and ensuring a tight fit.
- Measure the Roof Dimensions: Use a tape measure to check the width and length of the roof, ensuring you have enough roll roofing to cover the entire surface.
- Cut the Roll Roofing to Size: Use a utility knife to cut the roll roofing into sections that fit your roof dimensions. For wider roofs (over 36 feet), break the roll roofing into manageable sections.
- Store in Moderate Temperatures: If working in cold weather, store the roofing material indoors before use to prevent cracking.
Pro Tip: Plan each cut to minimize waste and ensure each section fits seamlessly along the roof. This helps reduce the number of seams and potential leak points.
Step 3: Install the First Row of Roll Roofing
The first row is crucial as it sets the foundation for the rest of the roofing.
- Start at the Bottom Edge: Place the first section of roll roofing at the lowest point of the roof, aligning it so that it overhangs the edge by 1/4 to 3/8 inches. This overhang protects the eaves from water damage.
- Secure with Roofing Nails: Nail the top edge of the roll, spacing nails approximately 6 inches apart for stability.
- Apply Roofing Cement to the Overlap: Apply a layer of roofing cement along the edges where the next row will overlap, creating a strong, waterproof bond.
Pro Tip: Use a chalk line to ensure each row is straight and aligned. This prevents gaps and misalignment issues as you continue working up the roof.
Step 4: Continue Installing Additional Rows
Work your way up the roof, carefully overlapping each new row for consistent coverage.
- Overlap Each Row: For single coverage, overlap each row by 2-3 inches. For double coverage, overlap by 16 inches for maximum protection.
- Secure with Nails and Roofing Cement: Nail the top edge of each row, then apply roofing cement to the overlapping edge.
- Check for Gaps and Loose Areas: Ensure each row is properly aligned and secure before moving to the next.
Pro Tip: For added stability, use roofing cement generously at each overlap. This enhances the waterproofing and durability of the roof.
Important Considerations: Tips for a Long-Lasting Roll Roof
Maintain Proper Slope for Performance
Roll roofing performs best on roofs with a 2/12 slope or greater. Roofs with lower slopes may benefit from materials like TPO or EPDM for enhanced waterproofing.
Prevent Water Pooling with Seam and Edge Management
Always apply roofing cement along each seam and edge to prevent leaks. Properly sealing seams also reduces the chances of early failure and extends the life of the roof.
Avoid Roofing Over Existing Layers
Installing roll roofing over an existing membrane can reduce durability and lead to leaks. For the best results, remove old roofing materials to create a clean, stable base.
Maintenance Tips: Keeping Your Roll Roof in Top Condition
Regular maintenance will extend the life of your roll roofing and help you spot minor issues before they turn into costly repairs.
- Inspect for Damage: After severe weather, check for loose nails, cracks, or wear at the seams.
- Patch Minor Leaks Promptly: Use roofing cement to seal any minor cracks or leaks to prevent further damage.
- Clean Regularly: Clear off any debris, leaves, or dirt to reduce water buildup and keep the roof surface clear.
Frequently Asked Questions (FAQs) About Roll Roofing Installation
Can I Install Roll Roofing Over an Existing Roof? It’s best to remove any previous roofing layers to ensure proper adhesion and a longer lifespan.
How Much Overlap Should I Use? Overlap each row by 2-3 inches for single coverage, or by 16 inches for double coverage.
What is the Expected Lifespan of Roll Roofing? With proper installation and maintenance, roll roofing typically lasts between 5 to 10 years.
