How Much Does a Roll of Roofing Felt Cost

Roofing felt cost varies by type, size, and quality, so estimating a project budget requires knowing the specifics of material and installation. This article explains typical prices, roll sizes, coverage, and factors that influence cost to help homeowners and contractors plan accurately.

Roll Type	Typical Roll Size	Coverage (Square Feet)	Average Retail Price
15# Asphalt-Saturated Felt	36″ x 144′	36	$10–$25
30# Asphalt-Saturated Felt	36″ x 144′	36	$20–$40
Synthetic Underlayment (Standard)	48″ x 200′	80	$50–$150
Premium Synthetic (Breathable)	48″ x 250′	100	$100–$300

Understanding Roofing Felt Types

Roofing felt comes in two main categories: traditional asphalt-saturated felt and modern synthetic underlayment. Asphalt-saturated felt is rated by weight (15# or 30#), and synthetic options are made from polypropylene or polyester blends with enhanced tear resistance and water-shedding performance.

15# Felt is lighter, less durable, and commonly used under single-layer asphalt shingles or as a temporary weather barrier.

30# Felt is thicker and more durable, often preferred for steep-slope roofs and in climates with higher wind or occasional ice.

Synthetic Underlayment offers better tensile strength, lighter weight, improved UV resistance, and longer exposure times, which can reduce labor time and rework.

Roll Sizes, Coverage And How To Calculate Needs

Roll size and coverage determine how many rolls are required. Common roll dimensions: asphalt felts at 36″ x 144′ cover about 36 square feet per roll (a “square” is 100 sq ft). Standard synthetic underlayments often come 48″ x 200′ covering approximately 80–100 square feet.

To calculate rolls needed: divide roof area in square feet by 100 to get squares, then multiply by coverage per roll. For overlapping and starter strips, add 10–15% wastage.

Example: a 2,000 sq ft roof is 20 squares. Using 30# felt (36 sq ft/roll) requires about 56 rolls before waste; with 10% waste, order ~62 rolls.

Typical Price Range For A Roll Of Roofing Felt

Retail price varies widely with material and brand. 15# asphalt felt30# felt

Synthetic underlayment

Contractor discounts, bulk purchases, and local market conditions can lower per-roll pricing by 10–30% for larger orders.

Factors That Affect Roofing Felt Cost

Several factors determine price: material type, roll size, brand reputation, performance features (slip resistance, UV exposure rating), and local supply chain dynamics. Higher tear strength, better slip resistance, and longer UV exposure ratings raise cost.

Regional timber industry activity, fuel costs, and import tariffs can cause short-term price swings. Seasonal demand—especially in spring and summer—also affects availability and pricing.

Specialty products, such as ice-and-water shield or peel-and-stick self-adhering underlayments, will cost significantly more per linear foot or roll due to adhesive layers and specialized membranes.

Cost Per Square Foot And Real-World Examples

Translating roll prices to cost per square foot helps compare options. For a 30# felt roll covering 36 sq ft priced at $30, the material cost is $0.83 per sq ft. For a synthetic roll covering 80 sq ft at $120, the cost is $1.50 per sq ft.

Example Estimates: For a typical 2,000 sq ft roof: asphalt 30# felt material might cost $1,200–$2,400. A mid-range synthetic underlayment might cost $800–$2,400, depending on roll coverage and pricing.

These material-only estimates exclude labor, fasteners, ice-and-water shield, drip edge, and disposal fees that can add significantly to total project cost.

Where To Buy Roofing Felt And Pricing Tips

Common purchase sources include big-box retailers, local roofing supply houses, and online distributors. Local roofing supply houses

Online marketplaces can be competitive for pricing but may add shipping costs for heavy rolls. Verify return policies and delivery times before ordering long-lead items.

Buyers should request product datasheets to confirm exposure rating, slip resistance (ASTM D1970, or manufacturer’s specs), and compatibility with roof coverings to avoid costly mismatches.

Installation Cost Considerations

Labor for installing underlayment typically runs higher for asphalt felt due to more frequent roll changes and slower handling, while synthetic underlayments often install faster but may require specialized fasteners or adhesives. Labor rates vary widely

Expect labor to add roughly $0.50 to $1.50 per sq ft for felt installation, and $0.80 to $2.50 per sq ft for synthetic underlayments depending on roof complexity. Complex roofs with steep slopes, multiple penetrations, or intricate flashing drive labor costs upward.

Permits, tear-off and disposal fees, and substrate repairs are additional variables that can increase the overall budget.

Cost-Saving Strategies

To reduce costs without sacrificing performance, consider buying in bulk for contractor pricing, choosing a mid-range synthetic underlayment that balances price and durability, or using 30# felt only where required by code and lighter felt elsewhere. Compare total installed cost, not just material price, because faster-installing materials can save on labor.

Reuse existing underlayment only when local code and condition allow; often complete removal and inspection is prudent. Schedule work during off-peak seasons to potentially negotiate better contractor rates.

Maintenance, Lifespan, And Replacement Timing

Roofing felt life depends on material and exposure. Asphalt felts

Synthetic underlayments generally last longer and tolerate longer exposure, making them preferable for phased construction or delayed roof covering. Regular roof inspections after storms and checking for lifting or blisters can extend service life.

Replacement is typically triggered by roof replacement or observable damage. Budgeting for underlayment replacement during full re-roofs is standard practice because it’s a relatively small portion of total cost but critical for long-term roof performance.

Common Questions About Roofing Felt Cost

Does Higher Price Mean Better Protection?

Not always. Higher-priced synthetics typically offer improved tear resistance, UV tolerance, and slip resistance but suitability depends on roof design and climate. Evaluate performance specs rather than price alone.

Is Synthetic Always Better Than Felt?

Synthetic underlayments outperform felt in many categories, but some building codes or manufacturers still accept felt when properly installed. Budget, exposure time, and local roofing practices influence the best choice.

How Much Should Be Budgeted For A Typical Re-Roof?

For a full re-roof on a 2,000 sq ft house, underlayment material costs typically range from $800 to $2,400 depending on type, with total project costs varying widely when labor, shingles, flashing, and disposal are included.

Key Takeaways For Budgeting Roofing Felt

Price Per Roll Varies Significantly Based On Type, With 15# Felt At The Low End And Premium Synthetics At The High End. Choose Material Based On Roof Requirements, Exposure Time, And Total Installed Cost.

Obtain multiple quotes, verify product specifications, and include waste, fasteners, and labor when estimating to avoid surprises. Prioritize underlayment performance where longevity, warranty, and local weather risks are concerns.