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How Much Does Roof Underlayment Replacement Cost?

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Key Takeaways

Average Cost per Square Foot$0.75 – $4.00
Total Cost Range$1,100 – $9,000
Common MaterialsAsphalt Felt, Fiberglass Felt, Synthetic / Polypropylene, Rubber (SBS)
Factors Influencing CostMaterial Type, Labor, Roof Size

Roof Underlayment Replacement Cost

Replacing roof underlayment is a critical maintenance task that ensures your roof remains leak-free and durable. The cost to replace roof underlayment varies depending on a range of factors including the size of the roof, the type of underlayment chosen, and labor costs.

Cost To Replace Roof Underlayment

Roof Size (Square Feet)Average Cost to Install
1,000$750 – $4,000
1,500$1,100 – $6,000
2,000$1,500 – $8,000
2,500$1,900 – $10,000
3,000$2,300 – $12,000
3,500$2,600 – $14,000

The total cost ranges from $750 to $14,000 depending on the size of the roof. On average, homeowners can expect to spend between $1,100 and $9,000 for most roof sizes.

Roofing Felt & Tar Paper Prices

Different materials used for roofing underlayment come at varying costs. Here is a breakdown of common materials and their price per square foot.

Roofing Felt and Tar Paper Cost

MaterialPrice per Square FootCompatible Roofing Systems
Asphalt Felt$0.05 – $0.15Asphalt shingles
Fiberglass Felt$0.15 – $0.70Asphalt shingles
Synthetic / Polypropylene$0.10 – $0.35Metal, tile, wood, slate, asphalt shingles, flat
Rubber (SBS)$0.20 – $0.90Metal, tile, wood, slate, asphalt shingles, flat

Difference Between 15 and 30-Pound Roofing Felt

The weight differences between 15-pound and 30-pound roofing felt are significant in terms of durability and cost. The 30-pound felt is thicker and provides better weather resistance compared to the 15-pound felt, making it a better choice for harsher weather conditions.

Cost Factors To Replace Roof Underlayment

When calculating the total cost to replace roof underlayment, multiple factors come into play.

Roof Underlayment Replacement Cost Breakdown

FactorCost per Square Foot
Roofing Felt / Tar Paper Materials$0.10 – $0.80
Installation Labor$0.65 – $3.20

Total Cost to Replace: $0.75 – $4.00

The two major cost factors are the price of the materials and the labor cost for installation. Together, they determine the final expense for replacing the underlayment.

Felt And Tar Paper Underlayment FAQs

What Is Roof Underlayment?

Roof underlayment is a protective layer installed between the roof deck and the roofing material (like shingles). It serves to provide an additional barrier against water infiltration and protects the roof from adverse weather conditions.

How Long Does Roof Underlayment Last?

The lifespan of roof underlayment varies based on the material used. Typically, asphalt felt can last around 20 years, while synthetic and rubber underlayments can last up to 50 years. Proper installation and maintenance can also extend the lifespan of the underlayment.

What Is The Best Roofing Underlayment?

The best type of roofing underlayment depends on various factors such as climate, roof type, and budget. Generally, synthetic underlayment is considered superior for its durability, water resistance, and longer lifespan compared to traditional asphalt felt.

Is Roofing Felt Waterproof?

Roofing felt is water-resistant but not completely waterproof. It provides a temporary barrier against water penetration until the roofing material is installed. For more comprehensive protection, synthetic underlayment is recommended.

How Long Can Roofing Felt Stay Exposed?

Roofing felt can stay exposed for a brief period, typically up to 30 days, before the roofing material must be installed. However, this duration can vary based on weather conditions. Extended exposure can lead to deterioration and reduced effectiveness.

What Roof Types Need Tar Paper Underlayment?

Tar paper underlayment is commonly used under asphalt shingles. It can also be used under other roofing materials like wood, metal, and slate, but synthetic underlayment is often preferred for these applications due to its enhanced durability.

How Many Layers of Felt Go Under A Roof?

Usually, one layer of roofing felt is sufficient for most residential roofs. However, for added protection, especially in areas prone to severe weather, two layers of felt may be recommended.

How Many Square Feet In A Roll of Roofing Felt?

A standard roll of roofing felt typically covers 200 square feet. However, coverage can vary based on the specific product, so it is important to check the manufacturer’s specifications.

Getting Estimates From Roofing Contractors

When it comes to replacing roof underlayment, hiring a qualified roofing contractor is essential. Getting multiple estimates ensures you get a fair price and quality work.

Questions To Ask

When evaluating roofing contractors, consider asking the following questions:

  • What type of underlayment do you recommend, and why?
  • What is included in your estimate? Does it cover materials and labor?
  • Do you provide warranties or guarantees on your work?
  • How long will the project take?
  • Can you provide references from previous clients?

By asking these questions, you can better assess the contractor’s expertise and reliability, ensuring a successful roof underlayment replacement project.

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