Roofing Paper Costs: What a Roll Typically Costs

Choosing the right roofing paper, or roofing underlayment, is a key step in any roofing project. The price of a roll depends on the type, width, length, and material, as well as regional market differences and the seller. Understanding typical roll sizes and coverage helps homeowners estimate project costs accurately and avoid overbuying or underbuying. This guide breaks down common options, price ranges, and practical tips for selecting roofing paper that protects a roof effectively while staying within budget.

What Is Roofing Paper?

Roofing paper, commonly referred to as roofing felt or underlayment, is a protective layer installed between the roof deck and shingles or other final roofing material. It serves as a secondary waterproof barrier, helps shed moisture, and provides a smoother surface for shingles to adhere to. There are several types, including traditional asphalt-saturated felt (often labeled by weight like 15-pound or 30-pound) and modern synthetic underlayment products. The choice affects durability, protection against wind-driven rain, and ease of installation.

Price Range For Roofing Paper

Prices vary widely based on material (asphalt-saturated felt vs. synthetic), width, length, and brand. Typical consumer price ranges include:

• Asphalt-saturated felt (15-pound or 30-pound): $15 to $40 per roll for common widths and lengths. These rolls are usually the most budget-friendly option and are widely available at home improvement stores.
• Synthetic underlayment (polypropylene or polyethylene-based): $25 to $70 per roll. These rolls tend to be lighter, weather-resistant, and offer longer warranties in some cases.
• Heavy-duty or premium synthetics with enhanced tear resistance or anti-slip surfaces: $40 to $120 per roll. These are often used on steeper slopes or in regions with harsher weather.

Common roll sizes include widths around 3 feet (36 inches) and lengths ranging from 100 to 200 feet. A typical roll covers about 300 to 400 square feet, depending on width and length. For precise budgeting, calculate coverage by multiplying width by length (in feet) to obtain square footage, then divide total roof area by square footage per roll.

Factors That Affect Cost

• Material type: Asphalt felt is cheaper upfront but may have shorter lifespans and lower moisture resistance than synthetic underlayments.
• Width and length: Wider rolls or longer lengths generally cost more per roll but reduce the number of joints and installed labor time.
• Brand and warranty: Reputable brands with longer warranties can be pricier but may offer better performance and durability.
• Roof design and slope: Steeper or more complex roofs can influence the amount of underlayment needed and potential waste from cutting.
• Climate considerations: Regions with heavy rainfall, snow, or wind-driven rain may benefit from higher-grade underlayment, increasing upfront costs but reducing risk of leaks.
• Local availability: Prices can vary by region due to supply chains and market demand.

Estimating How Much You Need

To estimate quantity, determine the roof area in square feet. Measure each plane of the roof or obtain building blueprints. For a rough calculation, multiply the length by the width of each section. Sum all sections to obtain total square footage. One roll of roofing paper typically covers 300 to 400 square feet, depending on size. Divide the total roof area by the roll coverage to estimate the number of rolls required, then add a small buffer (about 5–10%) for waste and overlaps.

Example: A roof with multiple slopes totaling 1,200 square feet would commonly require 3 to 4 rolls if each roll covers 300–400 square feet. If choosing a premium synthetic roll with 360-square-foot coverage, 3 rolls might suffice, but plan for 4 to be safe due to waste and wasteful overlaps at edges.

Where To Buy Roofing Paper

Roofing paper is widely available at home improvement retailers, roofing supply stores, and online marketplaces. When shopping, consider:

• Product specification: Confirm width (commonly 3 feet) and roll length. Check the underlayment type (asphalt felt vs. synthetic) and its warranty.
• Delivery and accessibility: For large orders, confirm whether the supplier offers bulk discounts or delivery to the job site.
• Return policy: If plans change, knowing the return terms can save money.
• Starter materials: Some projects require additional underlayment at eaves or rake edges; ensure you have enough to cover those sections.

Tips For Choosing And Using Roofing Paper

• Match to roofing method: If the final roof uses asphalt shingles, traditional asphalt felt is commonly used; for metal or tile roofs, synthetic underlayments may be preferred for better flexibility.
• Install with overlaps: Follow manufacturer guidelines for overlaps, typically 2 to 4 inches, to prevent water intrusion at seams.
• Weather window: Plan installation in dry conditions; installing underlayment in wet weather can compromise adhesion and performance.
• Ventilation considerations: Proper attic ventilation helps reduce moisture buildup that can affect underlayment performance and roof longevity.
• Safety and handling: Use appropriate fall protection on steep slopes and store rolls flat to prevent warping and damage.