Best Tar Paper for Roofing

The term tar paper, commonly known as roofing felt, serves as a protective underlayment layer beneath shingles. It shields the roof deck from moisture during construction and provides a secondary barrier against leaks. Selecting the right roofing felt involves weighing weight, material composition, perforation, and adhesive options. For homeowners and contractors in the United States, understanding the differences helps ensure durability, code compliance, and longer roof life. This guide highlights top choices, practical tips, and considerations for choosing the best tar paper for various roofing projects.

What Is Tar Paper And Its Purpose

Tar paper is a durable underlayment made from asphalt-impregnated felt or synthetic materials. Its primary role is to act as a moisture barrier, bridging the gap between the roof deck and the final shingles. It provides temporary protection during installation and can offer wind-driven rain resistance in certain conditions. Traditional asphalt-saturated felt is available in various weights, with higher weights offering greater tear resistance.

Key benefits include moisture mitigation, improved attic ventilation by reducing capillary action, and a smoother base for shingle installation. Choosing the right type depends on climate, roof pitch, and local building codes. As a general rule, higher-weight felt (such as 30 or 40 lb) is favored in areas with heavy rainfall or wind exposure, while lighter felt may suffice in milder climates.

Types Of Roofing Felt

Roofing felt comes in several formulations, each with distinct performance characteristics:

• Asphalt-Saturated Felt (traditional tar paper) is the most common option. Available in 15, 30, and 40 pound weights, it provides a durable moisture barrier and is cost-effective for many residential roofs.
• Fiberglass-Mat Roofing Felt uses fiberglass as the base for enhanced tear resistance and dimensional stability. It is less prone to wrinkling during installation and performs well in hot environments.
• Synthetic Underlayment replaces traditional felt with polymer-based materials. It often offers superior tear strength, lighter weight, and better resistance to moisture, though typically at a higher cost.
• Self-Adhering Underlayment combines a moisture-impermeable layer with an adhesive backing. It creates a superior seal around fasteners and can improve wind uplift resistance.

Understanding roof geometry and climate helps determine the best choice. For most new homes in the U.S., fiberglass or synthetic underlayments are common for their durability and performance in varied conditions. In very cold regions, self-adhering options may reduce ice dam risks by providing a tighter seal.

Best Tar Paper For Different Roofing Scenarios

Choosing the best tar paper depends on roof type, climate, and budget. The following scenarios reflect common U.S. conditions:

• Standard Residential Shingles In Moderate Climates—A 30 lb asphalt-saturated felt offers balanced protection and cost, with easier handling during installation.
• High-Wind or Steep-Slope Roofs—Consider 40 lb or heavier felt, or a synthetic underlayment, to improve tear resistance and wind performance on exposed edges.
• Cool Or Humid Regions—Synthetic or fiberglass underlayments with low water absorption help minimize moisture retention and reduce mold risk.
• Ice-Dam Prone Areas—Self-adhering underlayments provide a superior moisture seal along eaves and valleys, helping slow ice dam formation.

Budget considerations matter, but investing in the right underlayment can extend roof life and reduce repair costs. Local building codes may specify minimum underlayment standards; always check with a licensed roofer or building department for compliance.

Installation Tips For Roofing Felt

Proper installation is crucial to maximize tar paper performance. The following tips improve effectiveness and longevity:

• Surface Preparation—Ensure the roof deck is clean, dry, and smooth. Remove protruding nails or rough spots that could damage the underlayment.
• Overlap And Fastening—Overlap sheets by 2 to 4 inches, depending on product guidelines. Use corrosion-resistant nails with wide heads to prevent tearing, and drive nails at the recommended spacing.
• Sealing Edges—For self-adhering products, remove the release film gradually while pressing firmly to ensure a tight seal. Avoid stretching the material during application.
• Ventilation Considerations—Install underlayment with attention to roof vents and eave details to prevent moisture buildup and promote airflow.
• Temperature And Weather—Apply underlayment in dry conditions. Cold temperatures can reduce adhesiveness in self-adhesive variants and make handling harder.

Following the manufacturer’s instructions is essential. Incorrect installation can compromise moisture protection, lead to shingle damage, and void warranties.

Maintenance And Replacement Considerations

Roofing felt is an underlayment that can wear over time. Regular inspections help identify problems before leaks develop. Signs to watch for include tearing, wrinkling, exposed felt, and punctures from foot traffic or wind. In high-demand climates, felt may degrade faster, necessitating more frequent replacement during roof repairs or after severe weather.

Typical service life varies by material and climate but generally ranges from 10 to 20 years for traditional felt. For homes with extreme weather exposure, synthetic or self-adhering underlayments may offer extended lifespans and better performance in moisture-prone conditions. When replacing shingles, assess the underlayment’s condition and consider upgrading to a higher-performance product if wear is evident.

Environmental And Code Considerations

Many roofing projects must comply with local and state building codes, including requirements for underlayment type, wind uplift ratings, and installation methods. Some areas restrict the use of certain products based on vapor permeability and fire resistance. Environmentally conscious choices include selecting underlayments with lower volatile organic compounds (VOCs) and using recyclable or long-lasting synthetic options where appropriate. Always verify current code requirements and warranty conditions before purchasing.

Choosing the right tar paper also impacts energy efficiency. Proper underlayment helps maintain roof integrity, reducing the risk of leaks that can compromise insulation and indoor comfort. In regions with heavy rainfall or persistent humidity, investing in a higher-grade underlayment is a proactive step toward long-term performance.

Brand And Product Recommendations

While specific brands may vary by region, several widely used options consistently perform well in the American market:

• GAF Grand Sealer Or Self-Sealing Underlayments—Popular for their reliability and ease of installation on various roof types.
• Owens Corning Roofing Felt—Offers a range of fiberglass and asphalt-saturated options with solid tear resistance.
• Henry Company Roofing Felt—Known for durable asphalt-saturated felts and weather-ready synthetic products.
• Atlas Roofing Synthetic Underlayment—A strong choice for high tear resistance and moisture management.

Consult local suppliers for availability, warranty terms, and compatibility with existing shingles. Reading product data sheets helps compare weight, permeability, and adhesive properties to ensure alignment with project needs.

Key Takeaways

• Match the underlayment to climate and roof design for best performance and durability.
• Higher weight or synthetic options provide better tear resistance and moisture protection in demanding environments.
• Follow installation guidelines to maximize warranty coverage and prevent leaks.
• Check local codes for underlayment requirements and wind uplift ratings.