Roofing felt paper, also known as tar paper or asphalt felt, serves as a secondary underlayment beneath shingles to provide a moisture barrier and improve roof protection. Prices vary by type, thickness, width, and installation needs, and buyers must consider regional labor costs and material availability. This article breaks down the main price drivers, typical ranges, and practical tips to help contractors, homeowners, and DIYers budget effectively for roofing projects without compromising performance.
Overview Of Roofing Felt Paper
Roofing felt paper is available in several grades, with 15-pound and 30-pound options being the most common for residential applications. It comes in rolls that are typically 3 feet wide and several hundred feet long, designed to cover multiple squares of roof area. Felt underlayment protects decking during construction and provides an extra layer against wind-driven moisture. The choice between traditional asphalt-saturated felt and self-adhering variants affects both cost and ease of installation.
Key Price Factors
- Material Type: Traditional asphalt-saturated felt is usually the least expensive, while self-adhering, polymer-modified, or high-tack variants cost more but offer easier installation and better waterproofing.
- Weight and Thickness: Heavier 30-pound or 40-pound felt generally costs more per roll than 15-pound felt but may provide longer life in severe climates.
- Width and Length Of Roll: Wider rolls cover more area per roll, lowering cost per square foot but possibly increasing upfront price.
- Brand and Quality: Premium brands with better tear resistance or moisture resistance can raise price but improve performance over time.
- Regional Shipping And Availability: Local supply, freight costs, and regional demand influence price fluctuations.
- Installation Method: Self-adhering products save labor time, which can offset higher material costs.
Price Range By Type
Typical pricing reflects national averages and can vary by region and retailer. The ranges below describe common market options.
- Traditional Asphalt Felt (15#): Approximately $18–$40 per roll, depending on length and brand. Per square foot, this often translates to roughly $0.06–$0.15.
- Traditional Asphalt Felt (30#): Usually $25–$60 per roll, with per-square-foot costs around $0.08–$0.20.
- Self-Adhering Felt: Generally $40–$90 per roll, reflecting adhesive properties and ease of installation. Per-square-foot costs often range from $0.15–$0.40.
- Premium Or Specialty Variants: High-tack, fiberglass-reinforced, or moisture-resistant options may exceed $90 per roll, with higher per-square-foot rates.
Regional Variations And Market Trends
Prices can shift with supply chains, demand cycles, and local labor markets. In drought or supply-constrained regions, felt prices may rise modestly due to shipping and availability. Conversely, regions with robust distribution networks and high competition among retailers may see more stable pricing. Trend awareness helps buyers time purchases around promotions or bulk discounts, especially for large roofing projects requiring multiple rolls.
Costs Beyond The Material
Material cost is only part of the total. Installation-related expenses include labor (or time for DIY), flashing, fasteners, and roof deck preparation. Self-adhering felt can reduce labor costs by simplifying installation, while traditional felt may require more time and mechanical fastening. For replacement projects, removing old material and repairing damaged decking adds to the budget. Always factor into the estimate an extra percentage for waste, typically 5–10% due to cuts and alignment.
Saving Tips And Buying Tips
- Estimate Accurately: Calculate the roof area in squares (100 sq ft per square) and add 5–10% waste to determine roll quantity.
- Compare Per-Roll And Per-Square Costs: Convert prices to cost per square foot to compare options fairly.
- Consider Climate Needs: In wet or windy climates, self-adhering or moisture-resistant felt may offer better long-term protection, offsetting higher upfront costs.
- Leverage Bulk Purchases: Buying multiple rolls from the same supplier often yields volume discounts.
- Shop Seasonal Promotions: Home improvement retailers run sales events that reduce material costs, especially in late winter or fall.
Buying Tips
- Check Compatibility: Ensure the felt type matches roofing system requirements and local building codes.
- Inspect For Defects: Examine rolls for tears, water damage, or delamination before purchase.
- Ask About Warranties: Some underlayment products offer manufacturer warranties that can influence long-term cost considerations.
- Plan For Tools: Necessary installation tools (hammer, nails, utility knife, sealant) add to the overall project cost if not already on hand.
Frequently Asked Questions
What is the difference between 15# and 30# felt? The main differences are weight, durability, and price. Heavier rolls tend to resist tearing better and may last longer in harsh climates but cost more upfront.
Is self-adhering felt worth it? For faster installation and improved moisture resistance, self-adhering felt can be advantageous, particularly on complex roof shapes or in windy regions; it costs more but may save labor time.
How much should a homeowner budget for felt paper? For a standard asphalt-shingle roof, budget material costs in the range of $0.06 to $0.40 per square foot, depending on type and quality, plus labor and accessories. Always include a contingency for waste and repairs.