Types of Roofing Paper and How to Choose the Right One
Roofing paper plays a critical role in protecting structures from moisture and weather damage. It acts as a waterproof barrier under shingles or tiles, enhancing the roof’s durability and longevity. Selecting the right type of roofing paper is essential for effective waterproofing and ventilation in your roofing system. This article explores the most common types of roofing paper, their materials, uses, and benefits to help you make an informed decision for your roofing project.
| Type of Roofing Paper | Material | Key Benefit | Common Applications |
|---|---|---|---|
| Asphalt Saturated Felt | Organic or fiberglass base saturated with asphalt | Excellent moisture barrier and affordability | Residential roofs, under shingles |
| Rubberized Asphalt Membrane | Rubberized asphalt with adhesive backing | Superior waterproofing and self-adhering | Flashings, low slope roofs, critical areas |
| Synthetic Roofing Underlayment | Polypropylene or polyester fabrics | High tear resistance and lighter weight | Commercial and residential roofs, new constructions |
| Ice and Water Shield | Rubberized asphalt with plastic film | Protects against ice dams and water intrusion | Roof edges, valleys, and vulnerable areas |
Asphalt Saturated Felt Roofing Paper
One of the most traditional and widely used types of roofing paper is asphalt saturated felt. It consists of natural cellulose fibers or fiberglass mats heavily impregnated with asphalt. Available in 15-pound or 30-pound grades, this roofing felt serves as a reliable water barrier under roofing materials.
This material is both affordable and easy to install, making it a popular choice for residential roofing. It provides a moderate level of tear resistance and water resistance but may absorb moisture over time if exposed. Homeowners appreciate its weather protection, especially beneath asphalt shingles, but it is less durable than modern synthetic options.
Rubberized Asphalt Membrane
Rubberized asphalt membranes are a premium type of roofing paper known for exceptional waterproofing properties. These membranes typically feature a rubberized asphalt layer combined with a self-adhesive backing, allowing for watertight sealing without mechanical fasteners.
This type is commonly applied in roof flashings, around chimneys and skylights, and in low-slope roofing areas where water pooling may occur. Due to its incredible adhesion and elasticity, rubberized asphalt membranes withstand extreme weather conditions and structural movement with minimal risk of leaks.
Synthetic Roofing Underlayment
Synthetic roofing underlayment has rapidly gained popularity due to its advanced performance characteristics. Made from polypropylene or polyester woven fibers, synthetic underlayments are lighter, stronger, and more tear-resistant than traditional felt paper.
The key advantage of synthetic roofing paper is enhanced durability. It resists UV damage during roof construction, doesn’t absorb moisture, and offers better slip resistance for safer installation. Synthetic materials provide superior protection for roofs in harsh climates, making them ideal for both residential and commercial applications.
Ice and Water Shield
Ice and water shield membranes are essential for preventing damage from ice dams and water intrusion in cold climates. These membranes consist of rubberized asphalt laminated onto a polyethylene or plastic film backing.
Typically applied along roof edges, valleys, and areas prone to water infiltration, ice and water shields create a self-sealing layer that adheres directly to roof decking. This layer blocks water from entering the structure during freeze-thaw cycles, protecting homes from costly damage. Building codes in many northern states often require this protection.
Comparison Table: Roofing Paper Types
| Aspect | Asphalt Felt | Rubberized Asphalt Membrane | Synthetic Underlayment | Ice and Water Shield |
|---|---|---|---|---|
| Water Resistance | Moderate | High | High | Very High |
| Tear Resistance | Low to Moderate | High | Very High | High |
| Installation | Nail or staple | Self-adhering | Nail or staple, sometimes adhesive | Self-adhering |
| Cost | Low | High | Moderate | Moderate to High |
| UV Resistance | Low | Moderate | High | Moderate |
| Ideal Use | Typical residential roofs | Critical roofing areas, flashings | All roofs requiring durability | Roof edges and vulnerable spots |
Choosing the Right Roofing Paper for Your Project
Selecting the best roofing paper depends on your local climate, roof type, budget, and installation timeline. Asphalt saturated felt is a cost-effective option suitable for standard shingle roofs in moderate climates.
For enhanced durability and waterproofing, synthetic underlayments offer a modern upgrade, especially beneficial for long-term protection and steep or complex roofs.
Rubberized asphalt membranes provide unmatched water resistance for critical areas such as around chimneys and skylights. Meanwhile, ice and water shields are essential in regions prone to ice dams or heavy snowfall.
Consulting with roofing professionals can help identify the ideal underlayment type for your specific needs, ensuring your roof remains protected against water damage and weather-related wear.
Installation and Maintenance Tips for Roofing Paper
Proper installation is essential for roofing paper to perform effectively. Underlayments should be laid flat with staggered seams to avoid water infiltration. In windy areas, securing the paper properly to prevent lifting is crucial.
During installation, ensure overlaps meet manufacturer specifications, and flashing is integrated seamlessly with the underlayment to create continuous protection.
Maintenance typically involves periodic roof inspections to check for tears or damage. While roofing paper itself does not require routine maintenance, spotting shingles or tiles out of place early can prevent compromised protection.
Environmental and Safety Considerations
Modern synthetic roofing papers tend to be more environmentally friendly than traditional asphalt felt. They contain fewer petroleum-based materials and often generate less waste during installation.
Safety-wise, synthetic underlayments provide better traction for roofing contractors, reducing slip risks during work. However, care should still be taken during installation to use proper safety equipment and follow local building codes.
Common Myths About Roofing Paper
- Myth: All roofing paper is waterproof.
Fact: Traditional asphalt felt is water-resistant but not fully waterproof. Many roofing papers serve as a secondary barrier. - Myth: Thicker felt always means better protection.
Fact: Thickness matters, but the material composition and installation quality are just as important. - Myth: Synthetic underlayment is too expensive for residential use.
Fact: While costs are higher than felt, the longevity and performance often justify the investment.