We all want to feel safe and secure under our roofs, especially when storms roll in or the summer sun beats down. Our homes are our biggest investment, and protecting them starts from the top—literally. That’s why choosing the right roof underlayment isn’t just a technical detail—it’s a decision that can save us from leaks, costly repairs, and sleepless nights.

With so many options out there, it can feel overwhelming to pick the best underlayment for our needs. Whether we’re building a new home or upgrading an old one, understanding what makes a roof underlayment truly reliable gives us peace of mind for years to come. Let’s explore what sets the best options apart and how the right choice helps keep our families and investments safe.

What Is Roof Underlayment?

Roof underlayment sits between your home’s structural roof deck and the shingles. This protective layer blocks water, snow, and wind-driven rain from reaching the interior structure. Builders install underlayment over plywood or oriented strand board (OSB) before attaching shingles, tiles, or metal panels.

There are three primary types of roof underlayment: asphalt-saturated felt, synthetic, and rubberized asphalt. Asphalt-saturated felt uses organic or fiberglass base mats saturated with asphalt for moderate moisture protection. Synthetic underlayment, made from polypropylene or polyethylene, weighs less, resists tearing, and offers strong slip resistance compared to felt—for instance, GAF’s Tiger Paw or Owens Corning’s Deck Defense. Rubberized asphalt, containing asphalt and rubber polymers, provides enhanced waterproofing and self-seals around fasteners.

The underlayment’s role becomes critical when shingles blow off or water seeps beneath the surface. This barrier prevents costly leaks and damage to insulation or drywall. If you want long-lasting roof performance and fewer repairs, selecting a high-quality underlayment helps you guard against damage from severe weather or aging shingles.

Roofing codes in most states require underlayment for new installations or replacements. Insurance claims for storm or leak damage sometimes rely on whether this protective barrier’s been properly installed, so a choice driven by building standards leads to approval and coverage.

Professional roofers recommend synthetic underlayment for most climates because it handles UV exposure and heavy foot traffic better than felt. For regions prone to ice dams or wind-driven rain—like the Northeast and Midwest—rubberized asphalt gives added peace of mind. Picking the right type depends on your budget, local code, shingle material, and exposure to extreme weather.

Types of Roof Underlayment

Roof underlayment connects the deck and final roof covering, providing a safeguard against storms or water intrusion. Key types each serve a different purpose, tuned for climate and roof design.

Asphalt-Saturated Felt

Asphalt-saturated felt, often called tar paper, consists of either organic or fiberglass mats soaked in asphalt. Two weights, 15-pound (No.15) and 30-pound (No.30), exist, with the heavier option offering increased tear resistance. When considering budget-friendly options, asphalt felt remains a traditional pick. It’s most commonly used beneath asphalt shingles, wood shakes, and some tile applications. Wind and rain exposure can cause wrinkling, so consider felt mainly for low-traffic residential roofs in mild climates.

Synthetic Underlayment

Synthetic underlayment uses woven or spun polypropylene or polyethylene, creating a lightweight, durable membrane. Compared to felt, it resists tearing, mold, and UV exposure. Rolls offer larger coverage, simplifying installation for professional crews. You get increased walkability and weather protection, especially in complex, steep-pitched roofs or locations with variable weather. Most roofers in North America prefer synthetic underlayment for both asphalt shingle and metal roofing systems, since it provides reliable moisture blocking and longer service life. If your aim is maximum long-term value, synthetic often ranks first.

Rubberized Asphalt

Rubberized asphalt underlayment combines asphalt polymers with rubber-like modifiers and self-adhesive backing. Created specifically for areas with high ice dam risk or heavy storm exposure, it forms a watertight seal, even around fasteners and seams. Low-slope roofs, eaves, valleys, and penetrations often benefit from rubberized asphalt thanks to its self-sealing property. The higher cost matches the extra fail-safe benefits. If you manage projects in hurricane or snow-prone zones, this material stands out by offering premium leak protection and peace of mind.

Key Factors to Consider When Choosing the Best Roof Underlayment

Selecting roof underlayment involves more than comparing basic materials. Matching product features to climate, roof design, and long-term goals increases protection for your home and investment.

Weather Resistance

Weather resistance in roof underlayment determines how well your roof blocks moisture and wind-driven rain, especially after storms. Synthetic options block wind and water better than asphalt-saturated felt, so choose these if your area experiences hurricanes or heavy downpours. Rubberized asphalt underlayment stands out in regions with ice dams or wind-blown rain, thanks to its watertight seal. If you live in an area with extreme temperature swings or hail, opt for products rated for high resistance to water intrusion and UV degradation.

Durability and Longevity

Durability and longevity relate directly to your roof’s lifespan and maintenance needs. Synthetics, such as polypropylene-based underlayments, withstand foot traffic and tearing during installation much better than traditional felt. These products can last upwards of 30 years, as confirmed by manufacturers like GAF and Owens Corning. Rubberized asphalt, while more expensive, resists rot, fungal growth, and temperature-induced cracking, and it delivers decades of reliable protection under the harshest environmental conditions. Choose underlayment with a warranty that matches or exceeds your planned shingle life.

Installation Process

Installation process affects speed, safety, and long-term performance. Synthetic rolls come in wider formats and lighter weights, making them easier to handle and overlap accurately for a watertight fit. If you’re managing your own roof project, you’ll appreciate underlayment marked with alignment guides. Rubberized asphalt uses a self-adhering backing that reduces fastener use and seals around nail penetrations, which proves useful for valleys, eaves, and complicated rooflines. Asphalt-saturated felt can wrinkle if exposed to humidity, and careful handling remains necessary to prevent tearing during installation. Always check compatibility with your roof deck and local building codes before final selection.

Top Picks for the Best Roof Underlayment

Choosing quality roof underlayment impacts long-term performance and peace of mind. These standouts cover a range of budgets, climates, and roofing materials.

Best Overall

Synthetic underlayments lead in reliability and versatility. GAF Deck-Armor and Owens Corning ProArmor stand out for superior tear resistance, light weight, and waterproofing. Each offers UV protection for up to 60 days, making them suitable if delays occur during installations. Their slip-resistant surfaces enhance safety during application, reducing accidents. We find that both options maintain performance across asphalt, metal, or tile roofing.

Best for Asphalt Shingles

For asphalt shingles, CertainTeed RoofRunner and Atlas Summit 60 work best. Both products have high moisture resistance and convenient nailing lines, making installation faster and more accurate. RoofRunner scores highest for flexible handling and performance under intense heat, which benefits homes in hot regions. Each remains stable beneath shingles, minimizing chances of wrinkling or telegraphing.

Best for Metal Roofs

Rubberized asphalt underlayments such as Grace Ice & Water Shield and GAF WeatherWatch excel under metal. Both create a durable, watertight barrier and self-seal around fasteners common in metal roofing. Grace Ice & Water Shield handles extreme freeze-thaw cycles, preventing ice dam formation in northern climates. These underlayments resist tearing or breaking, keeping water intrusion at bay when sharp metal edges or movement occur.

Best Budget Option

If affordability tops your list, asphalt-saturated felt like Owens Corning Fiberglas™ Felt and Grip-Rite ShingleLayment stand up well to routine conditions. Each provides basic water resistance though less UV and tear protection compared to synthetics. Felt underlayment works best in mild climates and on smaller projects where savings matter more than advanced features. If you want reliable performance on a budget, standard felt keeps costs down without skipping essential protection.

Pros and Cons of Popular Roof Underlayment Options

Choosing between the leading roof underlayment options means weighing both advantages and drawbacks for each material. Below, we break down the strengths and limitations of asphalt-saturated felt, synthetic underlayment, and rubberized asphalt based on real installation experiences and industry consensus.

Asphalt-Saturated Felt

  • Pros:

  • Cost offers affordability for wide-scale projects. Typical rolls cost less per square foot than synthetic or rubberized asphalt.
  • Compatibility with asphalt shingles and wood shakes makes it a standard choice for basic residential roofing.
  • Installers often find felt easy to cut and handle for smaller or traditional roofs.

  • Cons:

  • Durability falls short compared to synthetics. Wrinkling or tearing may occur during heavy wind, rain, or foot traffic.
  • Water resistance can decline after repeated freeze-thaw cycles or prolonged UV exposure.
  • Lifespan ranges from 10 to 20 years, notably shorter than that of advanced synthetics.

Synthetic Underlayment

  • Pros:

  • Weight reduction and strength are standouts for fast-paced installation—a 10-square roll often weighs under half that of felt.
  • Superior tear resistance and flexibility help protect your roof during high winds, hailstorms, or complex valleys.
  • Mold and UV protection extend longevity up to 30 years, especially with leading products like GAF Deck-Armor or Owens Corning ProArmor.

  • Cons:

  • Price remains higher than traditional felt, especially with premium brands or extra features.
  • Incompatible with certain adhesives or fasteners, depending on your roof deck material.
  • Some municipalities may require added documentation or permits if synthetic underlayment isn’t standard in your area.

Rubberized Asphalt Underlayment

  • Pros:

  • Waterproof seal stops leaks even under ice dams or pooling water—crucial on low-slope or metal roof systems.
  • Self-adhering design speeds installation in cold or damp climates and helps prevent blow-offs.
  • Service life and resilience in severe weather events receive high marks from roofers using brands like Grace Ice & Water Shield.
  •  
  • Upfront cost per square foot ranks highest among all options, sometimes double that of synthetic underlayment.
  • Temperature fluctuations during installation can affect adhesion results if you install in extreme hot or cold.
  • Overlapping seams may require particular attention or primer for best performance on older or uneven roof decks.
Underlayment Type Pros (Distinct Strengths) Cons (Key Limitations)
Asphalt-Saturated Felt Economical, compatible, easy to install Short lifespan, less water resistance
Synthetic Durable, lightweight, mold/UV resistant Cost, compatibility limits, permits
Rubberized Asphalt Waterproof, self-adhering, durable Expensive, temperature/cold install issues

We’ve examined real-world scenarios for each option. If you’re considering high moisture or snow loads, prioritize rubberized asphalt for maximum defense. For quick installs on standard frames with a moderate budget, synthetic gives you the best mix of strength and flexibility. Pursuing a budget reroof on a mild-climate home? Asphalt-saturated felt will fit your needs, but won’t hold up against decades of storms or sunlight.

Conclusion

Choosing the best roof underlayment is a decision that can make a real difference in the long-term protection of our homes. When we invest in quality materials and take the time to match the right underlayment to our local climate and roofing needs we’re setting ourselves up for fewer headaches down the road.

Let’s keep in mind that the right underlayment is more than just an extra layer—it’s peace of mind for our families and our property. By making an informed choice now we can ensure our roofs stay strong and secure for years to come.

Frequently Asked Questions

What is roof underlayment and why is it important?

Roof underlayment is a protective barrier installed between the roof deck and shingles. It helps prevent water, snow, and wind-driven rain from causing leaks and damage to your home’s interior. Choosing the right underlayment adds an extra layer of protection, especially during storms or extreme weather.

What are the main types of roof underlayment?

The three primary types of roof underlayment are asphalt-saturated felt (tar paper), synthetic underlayment, and rubberized asphalt. Each type offers different levels of moisture protection, durability, and price to suit various needs and climates.

Which type of underlayment is best for severe weather?

Synthetic and rubberized asphalt underlayments are best for severe weather. Synthetic underlayment resists tearing, mold, and UV exposure, while rubberized asphalt provides a watertight seal, making it ideal for areas with heavy rain, snow, or storms.

Is roof underlayment required by building codes?

Yes, most state and local building codes require roof underlayment for all new installations and replacements. Proper underlayment is also important for insurance claims if your roof is damaged by storms or leaks.

How do I choose the right underlayment for my roof?

Consider your budget, local building codes, the type of roofing shingles, and your region’s weather conditions. Choose the most durable and weather-resistant option your budget allows, and ensure it is compatible with your roof deck.

What are the pros and cons of asphalt-saturated felt underlayment?

Pros: It’s affordable and widely available, making it a good choice for budget-conscious homeowners. Cons: It has a shorter lifespan, is less durable, especially in severe weather, and can wrinkle or tear easily.

Why choose synthetic roof underlayment?

Synthetic underlayment is lightweight, durable, and highly resistant to tearing, mold, and UV rays. It generally lasts longer than felt and is easier to install, making it a preferred option for most climates.

When should I use rubberized asphalt underlayment?

Use rubberized asphalt underlayment for high-risk areas, low-slope roofs, or in regions prone to heavy rain, snow, or extreme weather. It provides a watertight seal and self-adheres to the roof deck, though it is more expensive.

How long does synthetic underlayment last?

High-quality synthetic underlayment can last up to 30 years, offering excellent long-term protection for your home, especially in areas with frequent storms or extreme weather conditions.

Are there budget-friendly roof underlayment options?

Yes, asphalt-saturated felt is the most budget-friendly option. While it provides basic protection, it’s best suited for mild climates and may need replacement sooner than synthetic or rubberized options.

Does roof underlayment affect insurance claims?

Yes, having the proper roof underlayment can impact your insurance claims related to storm or leak damage. Most insurers require your roof to meet local building codes, which usually include underlayment installation.

Can I install roof underlayment myself?

Some underlayment types, like synthetic rolls, are lightweight and easier to install, while rubberized asphalt offers a self-adhering backing for better sealing. However, professional installation is recommended to ensure proper protection and code compliance.