Roll roofing, also known as rolled roofing, is a simple, economical option for covering low-slope roofs on sheds, garages, porches, and other outbuildings. It comes in long rolls that are typically 36 inches wide and about 100 square feet per roll, making quick work of large or multiple-structure projects. The primary materials are asphalt-saturated felt or fiberglass mat coated with asphalt, with some varieties featuring mineral granules for traction and UV protection. While roll roofing is inexpensive and easy to install for DIY projects, it offers shorter lifespan and limited color choices compared with asphalt shingles or metal roofing. This article explains what a roll roof is, how it’s used, and what to consider when choosing it for American homes and outbuildings.
What Roll Roofing Is
Roll roofing is a continuous sheet of asphalt-saturated material used to cover low-slope roofs. Most rolls are 36 inches wide and sold in 100-square-foot lengths, enabling rapid coverage of sheds, carports, and small additions. It can be smooth or mineral-surfaced (grit-coated). Installation relies on adhesive cement or self-adhesive seams and requires a clean deck with proper overlaps. It is designed for slopes typically under 4:12 and is not recommended as the primary roof material for homes facing high wind or heavy snow loads.
Types Of Roll Roofing
- Mineral-surfaced roll roofing (grit-coated): Provides traction and UV protection, helping resist weathering. Available in several colors and thicknesses, it’s a common choice for low-slope sheds and porches.
- Smooth roll roofing: A plain asphalt surface that is usually the least expensive option and hides fewer imperfections in the deck.
- Self-adhesive roll roofing (peel-and-stick): Offers quick installation with less cement required. It can be more expensive but simplifies sealing seams and edges.
Pros And Cons
- Pros: Very low cost, fast installation, suitable for sheds, carports, and other outbuildings, repairs are straightforward, lightweight and easy to handle.
- Cons: Relatively short lifespan compared with shingles or metal, limited color and texture options, less durable in high-wind or heavy-snow areas, may require more frequent maintenance or replacement.
Materials And Installation Basics
Before installation, ensure the roof deck is sound, dry, and clean. Begin with an underlayment or primer if recommended by the manufacturer, especially with traditional asphalt methods. Use a starter strip along the eave to ensure clean edges and proper seam alignment. Roll roofing is typically fastened with roofing nails along the edges and at field seams, spaced about 6 to 8 inches on the edges and 12 to 24 inches in the field, depending on the product and wind conditions. Overlaps are usually 2 to 3 inches. For self-adhesive varieties, remove the backing gradually as you press the sheet into place. Seal all seams with seam cement or the manufacturer’s tape or adhesive. Safety gear and fall protection are essential when working on any roof surface.
Key steps include preparing the surface, installing a starter strip, laying sheets with the correct overlap, nailing or securing edges, sealing seams, and finishing with flashing and edge treatments. The process is well-suited for DIY projects on flat to gently sloped roofs.
Durability, Maintenance, And Longevity
Roll roofing is optimized for quick, economical coverage rather than long-term performance. Typical lifespans range from roughly 5 to 15 years, depending on climate, roof slope, exposure to sunlight, and maintenance. UV exposure, temperature fluctuations, and foot traffic can cause cracking, blistering, and seam opening. Regular inspections after severe weather help catch wear early. Clean gutters and remove debris to prevent moisture buildup under seams. If a section shows significant wear or water intrusion, replacement of the affected area is usually the best option to maintain a dry roof.
Cost And Value
Rolled roofing remains one of the most affordable roofing options for low-slope applications. Material costs typically range from $0.40 to $1.50 per square foot, while installation by a professional can bring the total to roughly $1.50 to $3.00 per square foot, depending on region and roof complexity. For DIY projects, total costs can stay at the lower end of the range, as labor is minimized. When evaluating value, consider the roof’s purpose, expected lifespan, and the potential cost of more durable alternatives like asphalt shingles or metal if long-term performance is a priority.
Choosing Roll Roofing For A Project
Choosing the right roll roofing involves balancing budget, climate, and the roof’s role. Consider the following criteria: roof slope, exposure to heat and sun, wind zones, and the desired lifespan. For sheds, greenhouses, porches, and similar structures, mineral-surfaced and self-adhesive options provide better durability and ease of installation. For main residential roofs in harsher climates, assess whether a longer-lasting material might be a better fit. Always follow manufacturer instructions and local building codes, and factor in flashing, edge detailing, and ventilation as part of the overall system.
Installation Considerations And Best Practices
To maximize performance, use the correct fasteners and sealing method recommended by the product manufacturer. Ensure proper ventilation and drainage on the roof. Store rolls in a dry, sheltered area to prevent moisture damage before installation. Use a straightedge and a sharp utility knife to achieve clean, straight cuts. When working with self-adhesive products, keep the backing paper intact until the sheet is in place to prevent contamination of the adhesive. Finally, conduct a post-installation inspection to verify that all seams are properly sealed and that flashing is secure.
Summary Of Key Points
- Roll roofing is an economical option for low-slope roofs on sheds, porches, and outbuildings.
- Common types include mineral-surfaced, smooth, and self-adhesive varieties.
- It offers low cost and fast installation but a shorter lifespan than many other roof types.
- Proper installation, maintenance, and sealant use are essential for maximizing performance.