Cost of a Roll of Roofing Felt: Prices, Types, and Tips

The question “How Much Is a Roll of Roofing Felt” hinges on roll size, weight, material type, and regional market differences. This guide breaks down common options, current price ranges, and practical tips to help homeowners and contractors budget accurately for a roofing project. Understanding the variations in felt materials and roll dimensions will enable a clearer comparison of options and smarter purchasing decisions.

What Roofing Felt Is And Why It’s Used

Roofing felt, also known as tar paper or asphalt-saturated felt, acts as a secondary moisture barrier under shingles. It helps shed water and provides a surface for shingle installation. Traditional felt comes in various weights, typically 15-pound, 30-pound, or 40-pound grades, indicating base asphalt saturation and tear resistance. Synthetic underlayments are a modern alternative with different performance profiles and pricing. The choice between traditional felt and synthetic underlayment affects both upfront cost and long-term protection.

Common Roll Sizes And Materials

Most rolls available in the United States are 36 inches wide. Lengths commonly range from 144 to 200 feet. The weight or “pound” designation refers to the felt’s saturation and durability, with the 15-pound roll being the lightest and the 30- or 40-pound rolls offering greater tear resistance.

• 15-lb roofing felt: Lightweight, typically 36″ x 144′ (about 432 sq ft per roll).
• 30-lb roofing felt: Heavier, often 36″ x 144′ (roughly 432 sq ft per roll) or similar lengths.
• 40-lb roofing felt: Heavy-duty option with higher tear resistance, available in comparable roll dimensions.

Prices vary by brand, local supply, and whether the felt is traditional asphalt-saturated or a synthetic alternative. Synthetic underlayments (not traditional felt) come in different form factors and are priced separately, usually higher per square foot but offering improved durability and weather resistance.

Factors That Affect Price

• Weight and type: Heavier rolls (30-lb or 40-lb) cost more per roll than 15-lb, reflecting greater durability.
• Material: Asphalt-saturated felt is typically cheaper than synthetic underlayments, which may be sold as felt-like products with different performance specs.
• Roll length and width: Larger or longer rolls yield less cost per square foot, but may require different handling on site.
• Brand and retailer: Local supply houses, big-box home centers, and online retailers have price variations based on volume, proximity to warehouses, and seasonal demand.
• Regional factors: Freight costs, taxes, and local market conditions can shift pricing up or down.

Typical Price Ranges

As of the latest market data, rough price ranges per roll are as follows for standard 36″ wide rolls:

• 15-lb asphalt-saturated felt: About $25 to $45 per roll, depending on brand and location.
• 30-lb asphalt-saturated felt: Roughly $40 to $70 per roll.
• 40-lb asphalt-saturated felt: Generally $60 to $90 per roll.
• Synthetic underlayment (not traditional felt): Typically $60 to $120 per roll, with some premium options higher.

Note that a single roll of 36″ x 144′ covers about 432 sq ft. In practice, roof coverage is planned in squares (1 square = 100 sq ft), so one roll covers about 4.3 squares. Pricing per square can help compare with alternative underlayments and shingles costs.

Cost Comparison By Coverage And Use

When budgeting, translating roll price into cost per square foot or per square helps align with project estimates. See the quick comparison:

• <strong15-lb felt: $0.06–$0.10 per sq ft
• <strong30-lb felt: $0.10–$0.17 per sq ft
• <strong40-lb felt: $0.12–$0.20 per sq ft
• <strongSynthetic underlayment: $0.60–$1.20 per sq ft (varies by product)

Installation costs, waste, and overlap requirements can add to the overall expense. Some projects may only need felt in lighter duty applications or where local codes permit, while others may justify synthetic underlayments for extended roof life in harsh climates.

Regional And Seasonal Price Trends

Prices tend to fluctuate with demand, especially during peak roofing seasons in spring and fall. Freight costs and supplier promotions can shift local pricing. Home improvement chains sometimes offer bulk discounts for contractors, while independent roofing supply houses may provide more flexible quotes for larger orders. Tracking local promotions can yield meaningful savings on a per-roll basis.

Practical Tips To Save On Roofing Felt

• <strongEstimate accurately: Calculate area in squares (100 sq ft) to avoid over-purchasing or underbuying. Plan for overlaps and waste based on roof complexity.
• <strongCompare options: Consider both traditional felt and synthetic underlayment where appropriate; factor in long-term durability and weather resistance, not just upfront cost.
• <strongBuy in bulk: Contractors often save with bulk purchases from regional distributors or wholesalers.
• <strongCheck for bundles: Some retailers offer rolls in bundles with reduced per-roll pricing.
• <strongSeasonal timing: Price dips may occur between major projects or after summer, depending on stock clearance.
• <strongWarranty and code compliance: Ensure the chosen underlayment meets local building codes and warranty requirements for the roof system.

Where To Buy And What To Ask

Retail options include national home improvement stores, roofing supply centers, and online retailers. When shopping, ask about:

• Current price per roll and per square foot
• Roll dimensions (width, length) and weight rating
• Brand, whether asphalt-saturated or synthetic, and intended use
• Return policy for unused rolls and any bulk discounts

For larger projects, a local roofing supplier can tailor recommendations to climate, roof slope, and local building code requirements. Online reviews and product data sheets provide deeper insight into performance and installation considerations.

Summary: Making An Informed Purchase

Choosing the right roll of roofing felt involves balancing cost with durability and code compliance. Typical rolls run from about $25 to $90, depending on weight and material, with 36″ width and 144′ length being common standards. For many residential roofs, 15-lb or 30-lb asphalt-saturated felt offers economical protection, while synthetic underlayments serve higher-demand or longer-lasting installations. Accurate area calculations, awareness of local codes, and price comparisons across retailers help ensure a solid, cost-effective roofing underlayment choice.