What is Roll Roofing? Exploring the Basics, Benefits, and Costs

When it comes to roofing, there’s more than meets the eye. Roll roofing is one of the easiest methods for protecting your home from the elements. But what is roll roofing? And how does it work?

In this post, we’ll cover the basics of roll roofing, as well as its benefits and costs.

What is roll roofing?

Roll roofing, also known as asphalt roll roofing or modified bitumen roll roofing, is a type of roofing material that is commonly used for low-slope roofs.

It typically consists of a roll of material made of asphalt-impregnated felt or fiberglass, coated with a layer of asphalt or other bituminous materials on both sides. The rolls are usually made in standard widths of 36 inches, and they are put on the roof by overlapping them to make a waterproof barrier that goes all the way around.

Roll roofing is a low-cost and easy-to-install type of roof that is often used on sheds, garages, and some commercial buildings with low-slope or flat roofs, like some office buildings and some garages.

It is typically installed using nails or adhesive, and the seams between rolls are sealed with hot asphalt or other appropriate sealants. Roll roofing comes in different colors and, when installed correctly, can be a durable and weather-resistant roof covering.

However, roll roofing is not as durable as other types of roofing materials, such as asphalt shingles or metal roofing, and it may have a shorter lifespan. It is generally considered a temporary roofing solution and may require more frequent maintenance and replacement compared to other roofing options.

Roll roofing is also not suitable for roofs with steep slopes, as it is designed for low-slope applications.

What are the benefits of rolled roofing?

• Waterproofing: Rolled roofing is designed to provide a waterproof barrier on low-slope roofs, protecting the underlying structure from water damage. The asphalt or bitumen coating on the rolls provides a waterproof layer that helps prevent water from penetrating into the building.
• Weather resistance: Rolled roofing is designed to withstand exposure to various weather conditions, such as rain, snow, and UV radiation from the sun. The asphalt or bitumen coating on the rolls helps protect against weather-related damage and deterioration.
• Cost-effective: Rolled roofing is generally more affordable than other roofing materials, making it a cost-effective option for budget-conscious homeowners or property owners. It can be a suitable option for temporary roofing needs or for situations where budget constraints are a consideration.
• Ease of installation: Rolled roofing is relatively easy to install, making it a popular choice for DIY projects or for roofing contractors who are looking for a quick and straightforward installation process. It is typically installed by overlapping the rolls and securing them with nails or adhesive, which can simplify the installation process compared to other roofing materials.
• Temporary roofing solution: Rolled roofing is often used as a temporary roofing solution, particularly for structures such as sheds, garages, or temporary buildings. It can provide a relatively quick and cost-effective way to protect a structure from the elements until a more permanent roofing option can be installed.

What are the disadvantages of roll roofing?

• It’s not so durable: Rolled roofing is generally not as durable or long-lasting as other roofing materials, such as asphalt shingles or metal roofing. It may have a shorter lifespan and require more frequent maintenance and replacement, which could offset the initial cost savings.
• Very limited aesthetic options: Rolled roofing usually only comes in a few colors and has a plain look, which may not be as appealing to the eye as other roofing materials. It may not be the best option for homeowners or property owners who are looking for a roofing material that offers a wide range of design choices.
• Only as a temporary roofing solution: Rolled roofing is generally considered a temporary roofing option, and it may not be suitable for long-term roofing needs or for buildings that require a more permanent roofing solution.
• Limited slope suitability: Rolled roofing is designed for low-slope or flat roofs and may not be suitable for roofs with steeper slopes. It is not recommended for roofs with slopes greater than 2:12, as it may not provide adequate water runoff and could be prone to leaks.
• Installation complexity: Even though rolled roofing is usually thought to be easy to put on, it still needs to be put on correctly and with attention to detail to keep water out.

How to install roll roofing

Materials and tools you will need

• Rolled roofing material
• Roofing nails
• Hammer or roofing nail gun
• Utility knife
• Measuring tape
• Chalk line
• Roofing cement (optional)
• Roofing adhesive (optional)

Step 1: Prepare the roof surface

• Make sure the roof surface is clean, dry, and free of any debris or obstructions.
• Repair any existing damage, such as leaks or cracks, before installing the rolled roofing.

Step 2: Measure and mark the roof

• Use a measuring tape to measure the length and width of the roof area where you will be installing the rolled roofing.
• Mark the measurements on the roof using a chalk line, ensuring the lines are straight and level.

Step 3: Cut the rolled roofing

• Roll out the roofing material on a flat surface, such as the ground or a clean work surface.
• Use a utility knife to cut the rolled roofing to the desired length, allowing for overhang on the edges.
• If needed, cut additional pieces of roofing material to cover the entire roof area.

Step 4: Install the rolled roofing

• Start at one end of the roof and align the edge of the roofing material with the edge of the roof.
• Use roofing nails and a hammer or nail gun to secure the roofing material to the roof, placing nails along the edges and in the center of the material.
• Leave a small gap between each nail to allow for expansion and contraction of the roofing material.
• Repeat the process for each row of roofing material, overlapping each piece by at least 6 inches to ensure proper water drainage.

Step 5: Finish the installation

• Once you have installed all the roofing material, trim any excess overhang using a utility knife.
• If desired, you can apply roofing cement or adhesive along the edges of the roofing material for added protection against leaks and to secure the edges.
• Inspect the installed rolled roofing for any gaps or areas that may need additional sealing or fastening.

Tips for installing roll roofing

• Prepare the roof surface properly: Make sure the roof surface is clean, dry, and free of any debris or obstructions before installing rolled roofing. This will ensure proper adhesion and prevent any issues later on.
• Use the right fasteners: For the specific type of rolled roofing you are installing, use the roofing nails or staples that the manufacturer recommends. Use the appropriate size and spacing for the fasteners, and make sure they are driven in straight and flush with the roofing material.
• Overlap properly: When installing multiple layers of rolled roofing, make sure to overlap each layer according to the manufacturer’s instructions. Typically, a minimum overlap of 6 inches is recommended to ensure proper water drainage and prevent leaks.
• Use adhesive or cement as needed: Depending on the type of rolled roofing material and the manufacturer’s recommendations, you may need to use roofing adhesive or cement along the edges or seams to provide extra sealing and protection against leaks.
• Pay attention to the weather conditions. Install rolled roofing on a dry day with mild weather conditions. Avoid installing rolled roofing during extreme weather conditions, such as high winds, rain, or freezing temperatures, as this may affect the quality of the installation.
• Take safety precautions: Always use appropriate personal protective equipment (PPE), such as gloves, safety goggles, and non-slip footwear, when working on a roof. Use caution when climbing ladders and working at heights, and follow all safety guidelines and regulations.
• Inspect the installation: Once the rolled roofing is installed, carefully inspect the entire roof for any gaps, wrinkles, or areas that may need additional sealing or fastening. Address any issues promptly to prevent potential leaks or damage in the future.
• Seek professional help if needed: If you are not experienced with roofing installations or if the installation process seems complex, it’s best to seek professional assistance to ensure a proper and safe installation.

Top 3 recommended roll roofing

Rolled roofing vs. others

• Shingles: Shingles are individual pieces of roofing material, typically made of asphalt or wood, that are installed in overlapping rows to create a protective layer on a roof. Shingles are popular for sloped roofs and offer a wide range of design options, but they can be more expensive than rolled roofing and may require professional installation.
• Bitumen: Bitumen roofing is made from a mixture of bitumen (a type of asphalt) and various other materials, such as fiberglass or polyester, to create a durable and waterproof roofing material. Bitumen roofing is commonly used for low-slope or flat roofs and is known for its excellent weather resistance and longevity. It is usually put up in sheets, like rolled roofing, but it may need special techniques to be put up.
• Rubber roofing: Rubber roofing, also known as EPDM (ethylene propylene diene terpolymer) roofing, is a type of synthetic rubber material that is commonly used for low-slope or flat roofs. Rubber roofing is known for being strong, flexible, and resistant to UV light and the effects of weather. It is typically installed in large sheets that are adhered to the roof substrate, and it can be more expensive than rolled roofing but may have a longer lifespan.
• TPO: TPO (thermoplastic olefin) roofing is a type of single-ply membrane roofing material that is commonly used for commercial and industrial roofs. TPO roofing is known for being long-lasting, saving energy, and being resistant to UV light and chemicals. It is usually put on the roof in large sheets that are mechanically attached or stuck down.
• Torch-down: Torch-down roofing, also known as modified bitumen roofing, is a type of membrane roofing material that is installed using a torch to melt the bitumen and adhere the roofing material to the roof substrate. Torch-down roofing is known for being durable, resistant to weather, and flexible. However, it needs to be installed in a special way, so only trained professionals should do it.
• Metal: Metal roofing is made from metal sheets or shingles and is known for its durability, longevity, and resistance to fire, insects, and rot. Metal roofing is typically more expensive than rolled roofing, but it offers a wide range of design options and can last for several decades with minimal maintenance.
• Slate: Slate roofing is a natural stone roofing material that is known for its beauty, durability, and longevity. Because of how heavy they are and how to install them, slate roofs are typically more expensive than rolled roofs.
• Wood: Wood roofing, typically made from cedar or other types of wood, is known for its natural beauty and warmth. Wood shingles require regular maintenance and may be more susceptible to fire, rot, and insects compared to other roofing materials.
• Clay: Clay roofing, also known as clay tiles or terracotta roofing, is made from baked clay and is known for its durability, energy efficiency, and distinctive appearance. Because of how heavy and difficult they are to install, clay roofs can be more expensive than rolled roofs.

What materials are used in roll roofing?

Roll roofing is typically made from various materials such as asphalt, fiberglass, and polyester. Asphalt roll roofing is the most common type and is composed of a base material saturated with asphalt for waterproofing, and then coated with mineral granules for added durability and UV protection.

Fiberglass roll roofing consists of a fiberglass mat coated with asphalt, making it lightweight and resistant to tearing. Polyester roll roofing, on the other hand, is reinforced with polyester or a combination of polyester and glass fiber for strength and flexibility. These materials are designed to provide a cost-effective and easy-to-install roofing solution for structures like sheds, garages, and low-slope roofs.

What types of roofs can roll roofing be installed on?

• Residential roofs: Roll roofing can be used on residential roofs with low slopes or flat roofs, such as porches, sheds, garages, or small additions. It is often used as a temporary or budget-friendly roofing option for these types of structures.
• Commercial roofs: Roll roofing can be installed on commercial roofs with low slopes or flat roofs, such as warehouses, storage buildings, or small commercial buildings. It is often used when a cheap and easy roofing solution is needed.
• Industrial roofs: Roll roofing can be used on industrial roofs, such as those of factories, processing plants, or other industrial structures where low-slope or flat roofs are present and a temporary or economical roofing option is desired.
• Institutional roofs: Roll roofing can be used on institutional roofs, such as those of schools, hospitals, or government buildings where low-slope or flat roofs are present and a budget-friendly roofing option is needed.

What are the costs of using roll roofing?

The cost of using roll roofing consists of two main components: the cost of roofing materials and the cost of labor. When it comes to materials, roll roofing is often seen as a cheaper option than other types of roofing materials.

Material and labor costs for roll roofing can vary based on a number of factors. On average, roll roofing costs between $2.00 and $5.50 per square foot installed, or $3,200 and $12,000 for an entire project. The material cost for roll roofing typically ranges from $0.50 to $1.50 per square foot, while the labor cost for installation is usually around $1.50 to $4.50 per square foot.

When it comes to labor, the cost of installing roll roofing will depend on things like the size and complexity of the roof, the location of the project, and the experience and skill of the roofing contractor.

Most people think that roll roofing is easier to install than other types of roofing, like shingles or metal, because it is usually put on in large rolls and only needs to be put on in a few separate pieces. However, proper installation of roll roofing still requires skill and expertise to ensure it is done correctly and provides a durable and waterproof roof.

What kind of slope is roll roofing used on?

Roll roofing is typically used on low-slope or flat roofs, which are roofs with a pitch of 2:12 or less. This means that for every 12 inches of horizontal run, the roof rises less than 2 inches vertically.

Roll roofing is not suitable for roofs with steep slopes due to its composition and installation method, which are better suited for low-slope applications. Examples of structures where roll roofing is commonly used include sheds, porches, garages, and small additions that have low-slope or flat roofs.

Are there any special considerations when installing roll roofing?

• Proper substrate preparation: The substrate, or the surface where the roll roofing will be installed, must be clean, dry, and free from debris, dust, or any other contaminants. Proper substrate preparation is crucial for ensuring proper adhesion of the roll roofing material and preventing future issues such as leaks or premature failure.
• Adhesive application: Roll roofing typically requires adhesive to bond the roofing material to the substrate. It is important to follow the manufacturer’s recommendations for the proper application of adhesive, including the type of adhesive, the amount to be applied, and the method of application, to ensure a secure and durable installation.
• Sealing and flashing: Proper sealing and flashing are important to prevent water infiltration at vulnerable areas such as roof edges, penetrations, and seams. It is essential to use appropriate flashing materials and techniques recommended by the manufacturer to create watertight seals and ensure the longevity of the roll roofing system.
• Professional installation: Roll roofing installation requires skill and expertise to ensure a proper and durable installation. It is recommended to hire a professional roofing contractor who is experienced in installing roll roofing and follows the manufacturer’s guidelines and best practices for installation.
• Local building codes and regulations: It is important to adhere to local building codes and regulations when installing roll roofing. Building codes may have specific requirements for roll roofing installation, including ventilation, insulation, and fire ratings. It is important to consult with local authorities and obtain necessary permits before proceeding with the installation.

What specialized tools do you need for rolled roofing?

• Roofing knife or utility knife: A sharp roofing knife or utility knife is used to cut the roll roofing material to the desired size and shape during installation. It should have a sharp blade and be suitable for cutting through the specific type of roll roofing material being used.
• Adhesive applicator or brush: Roll roofing often requires adhesive to bond the roofing material to the substrate. An adhesive applicator or brush is used to evenly apply adhesive to the substrate or the back of the roll roofing material as per the manufacturer’s recommendations.
• Roll roofing roller: A roll roofing roller, also known as a hand roller or a seam roller, is used to press and smooth the roll roofing material after it has been installed to ensure proper adhesion and eliminate any wrinkles or bubbles.
• Roofing nail gun or hammer: Roll roofing is typically secured to the substrate with nails. A roofing nail gun or a hammer is used to drive nails through the roll roofing material and into the substrate, securing it in place. The type and size of nails used may vary depending on the specific roll roofing material being installed.
• Roofing cement or sealant: Roofing cement or sealant may be used to seal edges, seams, and flashing areas to provide additional waterproofing and ensure a watertight installation. The specific type of roofing cement or sealant used should be compatible with the roll roofing material being installed and applied according to the manufacturer’s recommendations.
• Safety equipment: Safety equipment such as gloves, safety glasses, and appropriate footwear should be worn during roll roofing installation to protect against potential hazards, such as sharp tools, adhesives, and nails.

FAQ

Modified bitumen vs. rolled roofing?

Modified bitumen and rolled roofing are both types of roofing materials commonly used on low-slope roofs. Most of the time, modified bitumen is more durable and lasts longer than traditional rolled roofing because it is made with additives that improve its performance. Modified bitumen is also more expensive than rolled roofing, but it offers better resistance to UV rays, weather elements, and foot traffic. Rolled roofing, on the other hand, is a more economical option and is typically used for temporary roofing needs or on structures where cost is a primary consideration.

What is self-adhesive roll roofing?

Self-adhesive roll roofing, also known as peel-and-stick roll roofing, is a type of roll roofing material that comes with a built-in adhesive backing. This eliminates the need for separate adhesives or torching during installation. Self-adhesive roll roofing is easy to put up because it can be peeled off and stuck directly to the surface. No extra glue or heat is needed.

Where can you buy rolled roofing?

Roll roofing is sold at a number of home improvement stores, stores that sell roofing supplies, and online stores. Large hardware stores, stores that specialize in roofing, and online marketplaces are all popular places to buy roll roofing. It is important to choose a reputable supplier or retailer to ensure that you are purchasing high-quality roll roofing material from a reliable source.

How long does rolled roofing last?

The lifespan of roll roofing depends on various factors, such as the type of material, climate, maintenance, and installation quality. On average, roll roofing can last between 5 and 10 years, although some higher-quality materials may last up to 15 years or more with proper care and maintenance. Regular inspection, cleaning, and timely repairs can help prolong the lifespan of roll roofing.

Rolled roof maintenance

Roll roofing generally requires minimal maintenance. Roll roofing needs to be checked regularly for signs of damage or wear, kept clean and free of debris, and made sure to drain properly. Any places that are broken or falling apart should be fixed right away to keep water from getting in and doing more damage to the roof.

Rolled roof repair and replacement

Roll roofing may need to be fixed or replaced if it gets damaged or reaches the end of its useful life. For repair, damaged areas may be patched with similar materials and glues. For replacement, the old roll roofing material may be taken off and a new one put in its place. It is best to hire a professional roofing contractor to figure out how bad the damage is and figure out how to fix it or replace it.

How do you glue down rolled roofing?

Most of the time, gluing down rolled roofing entails following the manufacturer’s instructions and using the proper adhesive or bonding agent on the substrate or the back of the roll roofing material. This can be done using a brush, an adhesive applicator, or a roller, depending on the specific type of roll roofing material being used. Follow the manufacturer’s instructions for how to apply the glue to make sure the roll roofing material sticks and bonds well.

What is the best underlayment for roll roofing?

The type of underlayment used with roll roofing can vary depending on the specific application and local building codes. For roll roofing, felt (usually asphalt-soaked felt #15 or #30), synthetic underlayment, or self-adhering underlayment are common types of underlayment. The best underlayment for roll roofing will depend on factors such as the local climate, building code requirements, and the specific type of roll roofing material being used. I suggest getting advice on the right underlayment for your roll roofing installation from the manufacturer and from your local building codes.

Is roll roofing waterproof?

Yes, roll roofing is designed to be waterproof to a certain extent. Roll roofing can effectively shed water and shield the underlying structure from water damage when properly installed and maintained. However, it is important to note that roll roofing is not completely waterproof and may be susceptible to leaks or water penetration if there are any defects, damages, or improper installation.

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