When it comes to roofing, selecting the best tar paper is essential for protecting your home from water damage and enhancing roof longevity. Tar paper, also known as roofing felt, acts as an underlayment between the roofing material and the roof deck. It provides a reliable moisture barrier and helps improve weather resistance. With multiple options available on the market, understanding the characteristics, benefits, and applications of various tar paper types can guide homeowners and contractors in making an informed choice.
| Tar Paper Type | Thickness | Weight | Benefits | Common Uses |
|---|---|---|---|---|
| 15 lb Roofing Felt | ~0.011 inches | 15 pounds per 100 sq ft | Economical, easy to work with | Light roofing jobs, temporary protection |
| 30 lb Roofing Felt | ~0.037 inches | 30 pounds per 100 sq ft | More durable, better weather resistance | Residential and commercial roofing |
| Synthetic Underlayment | Varies (lighter) | Lightweight | High tear resistance, moisture barrier | Premium installations, metal roofing |
What Is Tar Paper and Why It Matters for Roofing
Tar paper is a heavy-duty, paper-like material coated with tar or asphalt, used as an underlayment beneath shingles or other roofing materials. Its primary function is to provide a secondary barrier against water penetration, wind-driven rain, and ice dams. Additionally, tar paper prevents damage to the roof deck caused by moisture and helps regulate temperature fluctuations beneath the roofing system. Choosing the right tar paper ensures enhanced protection and longer-lasting roofs.
Types of Tar Paper for Roofing
1. 15 lb Roofing Felt
This is the lighter and more economical version of tar paper, weighing about 15 pounds per 100 square feet. It has a thickness of approximately 0.011 inches and is commonly used for small or temporary roofing projects. While easy to install and affordable, 15 lb felt offers less durability and weather protection compared to thicker options.
2. 30 lb Roofing Felt
Weighing about 30 pounds per 100 square feet, this tar paper provides enhanced durability and thickness (around 0.037 inches). It is the industry standard for most residential and light commercial roofing. The 30 lb felt is more resistant to tearing, tearing, and weather conditions and provides better waterproofing. It is the preferred choice for long-term roofing projects.
3. Synthetic Roofing Underlayment
Newer than traditional tar paper, synthetic underlayment is made from polypropylene or polyester materials impregnated with waterproof coatings. It is lighter and stronger than felts, offering superior tear resistance, slip resistance, and UV protection. Although not technically tar paper, synthetic underlayments have gained popularity as premium alternatives often used with metal roofs or high-end installations.
Key Features to Look for in the Best Tar Paper
- Water Resistance: Effective tar paper prevents moisture infiltration to protect roof sheathing and framing.
- Tear Strength: Strong underlayment resists ripping or tearing during installation and extreme weather.
- Thickness and Weight: Thicker, heavier felts offer better protection but require careful handling.
- UV Protection: Some tar papers include UV inhibitors to withstand sun exposure during construction delays.
- Slip Resistance: Textured surfaces improve safety for workers installing shingles or panels.
How to Choose the Best Tar Paper for Your Roofing Project
The choice depends primarily on the type of roof, climate, budget, and local building codes. Here are important factors to consider:
Climate and Weather Exposure
In regions prone to heavy rain, snow, or ice dams, a thicker 30 lb felt or synthetic underlayment provides better protection. For moderate climates, 15 lb felt might suffice for smaller projects.
Roof Type and Material Compatibility
Traditional asphalt shingle roofs typically pair well with 30 lb tar paper. Metal roofs and steep-slope designs may benefit from synthetic underlayment offering better durability and slip resistance.
Local Building Codes and Regulations
Many municipalities require at least a 30 lb roofing felt for residential installations. Confirm specific requirements with local building departments.
Budget and Installation Considerations
15 lb felt is more affordable but less durable. Synthetic underlayment is costlier but offers longer service life and easier installation for some roofing types.
Top Brands Offering Quality Tar Paper
| Brand | Product Range | Special Features |
|---|---|---|
| GAF | 15 lb and 30 lb felt, synthetic underlayments | Proven durability, UV resistant, slip resistant options |
| Fiberglas® Felt, synthetic underlayments | Enhanced tear resistance, lightweight, and water barrier | |
| CertainTeed | 15 lb and 30 lb felt, synthetic options | Thick, highly durable felts and premium synthetics |
| Tamko | 30 lb felt, synthetic underlayments | Heavyweight felts, reliable waterproofing properties |
Proper Installation Practices for Tar Paper Roofing Underlayment
Regardless of the type selected, installation quality greatly impacts performance. Key tips for effective tar paper installation include:
- Install in dry weather to avoid trapping moisture beneath the felt.
- Overlap edges by at least 2 to 4 inches to ensure full protection.
- Secure with galvanized roofing nails or staples spaced every 6 to 8 inches.
- Replace any torn or damaged sections promptly during installation.
- Avoid walking excessively on felt to prevent tears.
Maintenance and Longevity of Tar Paper Roof Underlayment
Though tar paper is a hidden layer, maintaining the roof exterior prolongs underlayment life. Inspect shingles regularly for damage, keep gutters clear to prevent water backup, and address leaks immediately. High-quality tar paper, if properly installed, can function effectively for 10 to 20 years or more beneath roofing materials.
Cost Considerations for Choosing the Best Tar Paper
| Type | Average Cost per Roll (approx.) | Coverage per Roll | Cost Factors |
|---|---|---|---|
| 15 lb Roofing Felt | $10 – $20 | 400 sq ft | Basic protection, lower durability |
| 30 lb Roofing Felt | $25 – $40 | 288 – 400 sq ft | Stronger protection, preferred choice |
| Synthetic Underlayment | $50 – $100 | 500 sq ft (varies) | Premium, longer lasting, more features |
Environmental Impact and Sustainability of Tar Paper
Traditional asphalt-based tar paper is petroleum-derived and not biodegradable, raising environmental concerns. Synthetic underlayments often incorporate recyclable materials and may have a smaller ecological footprint over their lifetime due to durability. Homeowners focused on sustainability should weigh product lifespan along with material content when selecting roofing underlayment.