Small Roll Roofing Felt for Residential Projects

Small roll roofing felt, often called tar paper or underlayment, is a lightweight, protective layer installed beneath shingles or other roofing materials. It helps shed moisture, provide temporary weather protection during installation, and offer a secondary barrier against wind-driven rain. This guide covers what small roll roofing felt is, its materials, sizes, installation basics, advantages and drawbacks, and how to choose the right product for American homes.

What Is Small Roll Roofing Felt

Small roll roofing felt is a thin, flexible sheet material used as an underlayment in roof construction. It comes in narrow rolls that are easier to handle in tight spaces or smaller roofing projects. Typically made from asphalt-saturated kraft paper or non-woven fiberglass or synthetic fibers, it acts as a secondary moisture barrier beneath the primary roofing material. In many residential applications, it provides temporary protection during construction and helps improve wind resistance of the roofing system.

Materials And Types

Common options include:

• Asphalt-Saturated Felt (tar paper): A traditional option with good moisture resistance and cost efficiency, often rated by weight (15, 30, or 40 pounds per 100 square feet).
• Non-Woven Synthetic Underlayment: More durable, tear-resistant, and less prone to wrinkling; suitable for steeper slopes and modern roof designs.
• Self-Adhering Underlayment: A peel-and-stick version that provides excellent waterproofing and simplifies installation on certain roof pitches.

Small rolls can be made of natural asphalt products or synthetic blends, each with different longevity, UV resistance, and temperature tolerance. For most states, choosing a product that meets local building codes and warranty requirements is essential.

Typical Sizes And Coverage

Small roll roofing felt is intended for narrow runs along eaves, valleys, or small repairs. Typical roll widths range from 15 to 36 inches, with varying roll lengths. Coverage per roll depends on width and length, and installation patterns can influence waste. A common rule is to plan for 8–10% waste due to overlaps and waste cuts. The following table summarizes typical options:

Material	Common Widths	Typical Coverage Per Roll	Best For
Asphalt-Saturated Felt	19″–36″	Approx. 32–60 ft per roll	Budget projects, traditional homes
Synthetic Underlayment	19″–36″	Approx. 60–100 ft per roll	Durability and modern roofs
Self-Adhering	36″	Approx. 40–60 ft per roll	Cold climates, quick weatherproofing

Before purchasing, verify the exact roll dimensions and coverage from the product label, and check local code requirements for underlayment underlayment thickness and type.

Installation Basics

Proper installation ensures the underlayment performs as intended. Steps typically include:

• Safety first: Use fall protection and follow ladder and roof safety guidelines.
• Dry surface: Ensure the roof deck is dry and clean before installation.
• Felt alignment: Roll out from bottom to top, aligning edges along eaves and valleys.
• Overlap pattern: Maintain an overlap of 2–4 inches on horizontal seams and 4–6 inches on vertical seams for most asphalt felts; synthetic underlayments may use different overlaps per manufacturer.
• Fastening or adhering: Nail or staple per product instructions for rolled felts; self-adhering types require removing the protective release liner.
• Sealing edges: Pay attention to edges around penetrations, skylights, and chimneys to maintain moisture protection.

In regions with heavy rainfall or wind, some builders prefer self-adhering or synthetic underlayment for enhanced protection, especially on low-slope roof sections.

Pros And Cons

Understanding the trade-offs helps homeowners choose wisely:

• Pros
  • Cost-effective protection during construction.
  • Provides an additional moisture barrier under shingles.
  • Simple to handle on smaller or intricate roof sections.
• Cons
  • Traditional asphalt felt can deteriorate faster under UV exposure if left exposed too long.
  • Some materials offer limited heat resistance in high-sun areas.
  • Non-woven synthetics and self-adhering options typically cost more upfront.

For best long-term performance, select an underlayment that matches the roof type, climate, and local code requirements.

Choosing The Right Small Roll Roofing Felt

Key considerations when selecting a product include:

• Climate and Slope: Steeper roofs and cooler climates may benefit from synthetic or self-adhering underlayments.
• Local Codes And Warranties: Some jurisdictions specify underlayment classes or materials; confirm warranty terms with the shingle manufacturer.
• Durability And UV Resistance: If the underlayment will be exposed for a period, choose a product rated for UV resistance and weather exposure.
• Installation Conditions: For tight or small projects, smaller roll widths provide easier handling.
• Budget: Asphalt felt remains the most economical option, while synthetics offer longer life and easier installation.

Reading product data sheets and consulting with a local roofing contractor can help ensure the right selection for a given project.

Maintenance And Lifespan

Underlayment does not last as long as shingles and is not designed to be a final weather barrier in many climates. If underlayment remains exposed for an extended period due to delayed roofing or repairs, replace it as soon as possible to maintain protection. After installation, inspect the roof after severe storms or high winds and repair any cuts, tears, or loose edges promptly. If replacing shingles, consider upgrading underlayment to a higher-performance material to improve long-term durability.

FAQs And Quick Tips

1. Can I use small roll roofing felt on all roof types? It is suitable for many residential roofs, but always check local codes and shingle manufacturer requirements.
2. Is self-adhering underlayment worth the extra cost? For cold or wet climates, or roofs with tight pitches, self-adhering options can provide superior waterproofing and wind resistance.
3. How long does small roll roofing felt last? Lifespan varies by material and exposure; asphalt felts may degrade within a few months if left exposed, while synthetics last longer under the right conditions.
4. Should underlayment be replaced with new shingles? Yes, when re-roofing, replacing underlayment ensures optimal protection and adherence of shingles.