When it comes to building or replacing a roof, the material on the surface (like shingles or metal panels) gets most of the attention. However, the layer beneath, known as the underlayment, is equally essential.
This invisible barrier lies between the roof deck and the outer material, acting as a safeguard against water, wind, and other elements.
Let’s explore ten of the best roofing underlayments available, each with unique qualities and benefits, to help you make an informed choice.
1. Asphalt-Saturated Felt: Affordable and Dependable
One of the oldest and most common underlayments, asphalt-saturated felt, is often referred to as “felt paper” or “tar paper.”
Made from a combination of organic or fiberglass base and asphalt, this type is popular because it’s affordable, easy to install, and compatible with many roofing materials like shingles, shakes, and tiles.
- Pros: Cost-effective, breathable (allows moisture to escape), easy to install.
- Cons: Tends to tear more easily in high-wind areas, and has a shorter lifespan in extreme weather conditions.
2. Synthetic Underlayment: Lightweight and Durable
Synthetic underlayment is made from advanced polymers, making it lighter, stronger, and more resistant to UV rays than traditional felt. Due to its durability and resistance to tears, it has gained popularity as a premium option.
- Pros: Highly durable, resistant to mold and UV rays, easy to handle.
- Cons: More expensive than felt and often requires specific fasteners and installation techniques.
3. Rubberized Asphalt Underlayment: Flexible and Waterproof
Rubberized asphalt underlayment is a high-performance material that combines asphalt with rubber polymers, creating a self-sealing barrier.
This type of underlayment is particularly suited for wet climates as it provides excellent waterproofing.
- Pros: Self-seals around fasteners, highly waterproof, flexible, ideal for areas with heavy rainfall.
- Cons: Higher price point and generally requires professional installation for best results.
4. Peel and Stick Underlayment: Easy Application
Peel and stick underlayment is another waterproof option designed with an adhesive backing that makes it simple to apply. Many roofers recommend it for additional moisture protection in vulnerable areas, like roof valleys or along eaves.
- Pros: Simple to apply, great for DIY projects, adds an extra waterproof layer.
- Cons: Costs more than standard felt and may not adhere as well in colder temperatures.
5. Polyester-Reinforced Felt: Durable and Flexible
Polyester-reinforced felt is a specialized type of felt underlayment that incorporates polyester for added flexibility and durability.
This enhanced material can withstand more severe weather conditions than regular asphalt felt.
- Pros: Increased strength and flexibility, more tear-resistant than standard felt.
- Cons: Generally, it costs more than regular felt but offers better performance.
6. High-Temperature Underlayment: Ideal for Metal Roofing
High-temperature underlayments are specifically designed to withstand extreme heat, making them ideal for metal roofs or other roofing materials that retain heat.
This type of underlayment can handle temperatures as high as 250°F without degrading.
- Pros: Handles extreme heat, perfect for metal or tile roofs in hot climates, won’t degrade or melt.
- Cons: Higher cost, mainly needed for specific roofing materials like metal.
7. Fiberglass-Reinforced Felt: Strong and Fire-Resistant
Fiberglass-reinforced felt is a type of asphalt felt that incorporates fiberglass layers for increased durability and fire resistance. This makes it a great choice for areas prone to high winds or fire hazards.
- Pros: Durable, fire-resistant, better suited to areas with high wind speeds.
- Cons: Heavier and can be harder to install than regular felt, slightly higher cost.
8. Self-Adhering Membranes: Great for Ice and Water Shielding
Self-adhering membrane underlayments are designed to stick directly to the roof deck without needing nails.
Often used in areas prone to ice dams or heavy snowfall, they provide excellent waterproofing and sealing around roof edges and valleys.
- Pros: Self-sealing, provides added protection in cold climates, easy application.
- Cons: Higher cost and typically used only in specific areas rather than as full-roof underlayment.
9. Breathable Synthetic Underlayment: Prevents Condensation
Breathable synthetic underlayment allows moisture trapped under the roof to escape, which helps prevent condensation and mold growth.
This type of underlayment is particularly helpful in humid climates where moisture control is a concern.
- Pros: Prevents mold and mildew by allowing moisture to escape, durable in all climates.
- Cons: Costs more than non-breathable synthetic options and requires professional installation to ensure proper performance.
10. Non-Bitumen Synthetic Underlayment: Lightweight and Long-Lasting
Non-bitumen synthetic underlayment is a premium option made from woven polymers, offering a lightweight, tear-resistant material. It’s known for its durability and longevity, especially in areas with extreme weather.
- Pros: Lightweight, highly resistant to tearing and UV rays, suitable for extreme weather conditions.
- Cons: Among the most expensive options, but the long-term durability often justifies the cost.
Choosing the Right Underlayment for Your Roof
With so many underlayment options, finding the best one for your roof might seem a bit overwhelming.
Each type offers distinct benefits, but there are a few factors that can guide your decision and help you choose a reliable and long-lasting underlayment for your roofing system.
Here are some practical tips to consider:
1. Consider Your Climate
The climate in your area plays a huge role in deciding which underlayment will perform best for you:
Heavy Rain or Snow
If you live in an area with frequent rainfall or heavy snowfall, waterproofing should be a top priority. Rubberized asphalt or self-adhering membrane underlayment provides superior water resistance and prevents moisture from seeping through to your roof deck.
Hot, Sunny Climates
In areas with intense sunlight or high temperatures, you’ll need an underlayment that can withstand heat without degrading. High-temperature underlayments are designed to resist melting and deterioration, even on roofs that can reach extreme temperatures.
Cold Climates
For regions where freezing temperatures are common, ice dams can form along the edges of the roof, leading to water backup and potential leaks. In these cases, consider a rubberized asphalt underlayment in vulnerable areas such as eaves and valleys, as it will help prevent water from seeping in during freeze-thaw cycles.
2. Think About Your Roofing Material
The type of roof material you choose also influences which underlayment will work best:
Metal Roofs
Metal roofs can retain heat, which is why they work well with high-temperature or synthetic underlayments that can handle these conditions without warping or deteriorating.
Asphalt Shingles
Asphalt shingles are compatible with various underlayment types, so you have flexibility in your choice. Synthetic underlayments and asphalt-saturated felt are popular because they offer excellent water resistance and durability.
Tile Roofing
Tile roofs are durable but heavy, so underlayment is crucial to provide additional support and protect against moisture. Rubberized asphalt or peel-and-stick underlayment works well with tile roofs because they can conform to the shape of the roof.
3. Evaluate Durability and Cost
Roofing is an investment, and choosing the right underlayment can maximize that investment by extending the life of your roof:
Budget-Friendly Options
If you’re working within a limited budget, asphalt-saturated felt is a solid choice. While it may not have the longevity of synthetic or rubberized options, it’s affordable and effective, especially for smaller or simpler roofing projects.
Long-Term Investment
For those planning to stay in their home long-term, synthetic or rubberized asphalt underlayments are worth the higher upfront cost. These options are built to last and can save you money on future repairs, making them a wise choice in the long run.
4. Decide on Full-Roof or Partial Coverage
In some cases, you may not need to cover the entire roof with premium underlayment. Certain areas are more prone to leaks than others, so a combination approach can be both cost-effective and efficient:
Full Coverage
If you’re looking for maximum protection, especially in climates with extreme weather, consider using synthetic or rubberized underlayment over the entire roof. This full coverage can help protect against leaks and add extra insulation, which can improve energy efficiency and maintain indoor temperatures.
Partial Coverage in Key Areas
In other cases, full coverage may not be necessary. Often, the areas most at risk for leaks are along the roof’s edges, valleys, and around skylights or vents.
Using premium underlayment, like peel-and-stick or rubberized options, in these specific areas while applying standard asphalt-saturated felt over the rest of the roof can be an effective strategy.
This approach gives added protection where it’s needed most without requiring the higher expense of covering the entire roof.
Why Underlayment Matters
While it may seem like an invisible part of your roof, underlayment plays a major role in the durability, safety, and performance of your roof. Without a quality underlayment, water can seep through tiny cracks and gaps, leading to rot, mold, and even structural damage over time.
With the right underlayment, you’re adding an extra layer of defense, giving you a longer-lasting roof that protects your home from all kinds of weather.
Pickle Roofing Solutions: Here to Help
Our team understands the importance of using the right materials and has years of experience in roofing installation and repair. So, if you’re unsure which underlayment is right for your roof, Pickle Roofing Solutions is here to help!
Let us know if you’d like to schedule a consultation or if you have any questions about roofing materials and underlayments. Contact us today at (469) 373-3985 and make your roofing project a worry-free experience.