How to Choose the Best Roofing Underlayment for Your Home

Your roofing system should always use top-quality products and materials to guarantee adequate protection from harsh exterior elements in Phoenix. Even the tiniest hole on the roof can become problematic, leading to costly issues like roof leaks. One roofing component that should always be in great condition is the underlayment.

What Is a Roofing Underlayment?

A roofing underlayment is a protective layer between the roof deck and the roofing materials, such as shingles or tiles. Its main purpose is to provide another barrier against moisture, preventing water infiltration in case the outer roofing material fails. Underlayment can also offer some degree of thermal and sound insulation.

Your Roofing Underlayment Guide to Choosing the Best One for Your Home

If you plan on replacing or maintaining your roofing system, you should learn how to choose the right roofing underlayment. Doing so will drastically reduce the time needed to complete your roofing project in Phoenix, Arizona. Here are the basic steps to choosing a proper roofing underlayment:

1. Understand the Purpose and Functionality

The main function of the underlayment is to act as a backup protection if the exterior roof covering is compromised. Additionally, it offers some level of insulation and protects against wind and extreme weather. Knowing how it functions can help narrow down choices based on a home’s needs.

2. Evaluate the Local Climate and Weather Conditions

Assess your area’s weather conditions, as these will influence the type of underlayment best suited for your home. In areas with high humidity or heavy rainfall, a waterproof underlayment, such as rubberized asphalt, can prevent moisture penetration. Conversely, areas like Phoenix, exposed to extreme heat or high UV radiation, can choose a synthetic underlayment for durability and resistance.

3. Consider Roof Material Compatibility

Certain roofing materials work better with specific types of roofing underlayment. For example, metal roofs are often paired with synthetic underlayment because of their lightweight nature and enhanced moisture protection, while tile roofs may use asphalt-saturated felt. Always consult with manufacturer guidelines or a roofing professional to achieve compatibility between your roofing material and the underlayment.

4. Consider Installation and Labor Costs

Different types of underlayment differ in their ease of installation, which affects labor costs. Synthetic underlayments are generally easier and quicker to install due to their lighter weight and larger sizes, potentially reducing labor costs. In contrast, traditional underlayments like felt may need time and effort to lay on the roof. Balancing installation costs with product costs can keep you within budget while selecting an underlayment that suits your needs.

5. Assess Durability and Lifespan

Evaluate the expected lifespan and durability of different underlayment options. Synthetic underlayments generally have a longer lifespan and are more resistant to wear and tear, making them a cost-effective solution over time despite a higher initial investment. If you want the roof to last for many decades with minimal maintenance, choose an underlayment with a longer lifespan.

6. Check for Code and Warranty Requirements

Make sure your chosen roofing underlayment meets local building codes and regulatory requirements, which are different per location. Also, check the warranty terms offered by manufacturers. Some roofing systems may need certain underlayments to maintain warranty coverage on the overall roofing structure. Complying with codes and taking advantage of warranty protections can offer peace of mind and protect your roofing investment.

7. Seek Professional Advice

Lastly, consult with a roofing contractor in Phoenix, Arizona, who has years of work experience. They can give details about the best options and identify specific requirements you might overlook. Their expertise can help you make sound decisions and choose a roofing underlayment well-suited for your home’s architecture, local environment, and budget.

Benefits of Installing the Correct Roofing Underlayment

Underlayment is an important material in any roofing system. Failing to include them in your roofing project can cause many complications. Below are several benefits that a roofing underlayment provides:

• Moisture Protection. One of the primary benefits of installing the correct roofing underlayment is it provides extra protection against leaks. If the outer roofing material has signs of damage, the underlayment acts as a secondary barrier and prevents water from reaching the roof deck. It also stops rot or mold from forming, which can lead to expensive repairs.
• Enhanced Weather Resistance. The right underlayment can improve a roof’s resistance to severe weather conditions, such as heavy rain, snow, and high winds. It helps seal the roof deck by adding an extra layer that guarantees better roofing material adhesion and enhanced wind uplift resistance.
• Increased Energy Efficiency. Some roofing underlayments have insulating properties that improve energy efficiency. A well-insulated roof reduces heating and cooling costs by maintaining a more consistent indoor temperature, decreasing HVAC system use and leading to energy savings.
• Prolonged Roof Lifespan. By adding another layer of protection against physical wear and extreme weather conditions, the correct underlayment can extend the roof’s longevity. It reduces the strain on the main roofing material, minimizing maintenance needs and postponing extensive services like a full roof replacement. A long-lasting roof can also lead to long-term cost savings.
• Fire Resistance. Certain types of underlayments offer increased fire resistance. These products can help adhere to building codes and safety standards by reducing the flame spread on the roof, offering another crucial layer of home protection during a fire.
• Noise Reduction. Roofing underlayments can contribute to sound dampening, particularly from external sources such as rain, hail, or wind. This is mainly beneficial for homes situated in noisy environments. It helps create a quieter, more comfortable indoor living space.
• Warranty Compliance. Using an underlayment specified by roofing manufacturers can be vital in complying with warranty terms. Compliance can protect homeowners by keeping warranties valid and offering coverage should defects or issues happen within the covered period.
• Versatility and Compatibility. Quality underlayments are compatible with other roofing materials, making them versatile and adaptable to many roofing styles and structures. This compatibility ensures smooth integration with the roofing material, improving the roofing system’s overall performance and aesthetic appeal.

What Is the Best Roof Underlayment?

You have several types of roof underlayment options, so you must learn what each type can offer you. Gaining extensive details about each type of roofing underlayment can broaden your knowledge in creating a reliable and durable roofing system. Here are some of the types of underlayment you can install on your roof:

Asphalt-Saturated Felt

Also known as “felt or tar paper,” asphalt-saturated felt is one of the oldest roofing underlayment types. It comes from saturating organic paper or mat with asphalt to create a water-resistant barrier. Felt is available in different weights, usually 15-pound and 30-pound options, with the latter providing thicker and more durable protection.

Despite its traditional use, felt underlayment tears easily, especially when exposed to prolonged moisture. Nonetheless, it remains a cost-effective option for those seeking a more economical option. Although, it may not be the most popular choice for roofs in areas with harsh weather conditions.

Rubberized Asphalt

Rubberized asphalt underlayments are known for their superior roof waterproofing properties. They have a higher asphalt percentage and include extra rubber polymers, making them highly efficient at sealing around nails and fasteners.

These peel-and-stick underlayments have a self-adhering back to simplify the installation process and enhance their watertight seal. Rubberized asphalt is ideal for areas prone to heavy rainfall or ice damming, but they’re more costly than other types.

Synthetic Underlayment

Synthetic underlayments made from polypropylene or polyethylene are becoming increasingly popular due to their durability, lightweight nature, and versatility. They provide excellent tear resistance, UV protection, and resistance to mold and mildew.

Synthetic roof underlayments are easier to install as they are lightweight. They can also cover larger areas without compromising strength, reducing installation time and labor costs. Synthetic underlayments are an excellent choice for areas with diverse or harsh climates and roofing projects needing long-term reliability and performance.

Self-Adhered Membranes

Self-adhered underlayments combine aspects of rubberized asphalt and synthetic materials. These membranes have a sticky side, enabling roofers to stick them to the roof deck without needing fasteners. This feature improves water and air resistance, which protects against intense rain, high winds, or ice buildup. The easy-to-install feature and robust protection make self-adhered membranes a premium choice for many homeowners.

Synthetic vs. Felt Underlayment: A Side-by-Side Comparison

Choosing between synthetic and felt underlayment is a common consideration in many roofing projects in Phoenix. Each has distinct features, advantages, and disadvantages, influencing the choice based on the home’s roofing needs. Let’s explore the roof underlayment comparison in detail:

	Felt Underlayment	Synthetic Underlayment
Composition and Material	Traditionally, felt underlayment is composed of a base material, usually organic (wood cellulose) or fiberglass mat, saturated with asphalt to provide water resistance. It is commonly available in 15-pound and 30-pound weights, which determine its thickness and durability.	This type uses engineered materials like polypropylene or polyethylene. It’s a newer technology than felt and can offer performance. Synthetic roofing underlayments are generally lighter and thinner but stronger and more durable.
Moisture and Water Resistance	While asphalt-saturated felt is water-resistant, it can degrade when exposed to prolonged moisture. It absorbs water that leads to wrinkling, tearing, or disintegration over time, especially if it’s not covered with roofing material.	This material excels in moisture protection because of its water-repellent and non-absorbent material. They maintain integrity better under wet and dry conditions without deteriorating, making them ideal for areas with severe wind-driven rain.
Durability and Lifespan	Felt is susceptible to tearing and degradation when exposed to the elements for extended periods. Its organic components are more prone to mold and mildew growth, possibly shortening its lifespan.	These underlayments are tear-resistant and offer better resilience to physical damage during a roof installation job. They also have added UV inhibitors to withstand sunlight exposure without serious degradation, extending their useful life.
Installation Considerations	Felt is heavier and may require more effort to handle and install. During installation, overlaps and wrinkles can form, affecting its waterproofing capability. It is generally installed with more roofing nails, which can create water entry points if not sealed properly.	These are lighter and easier to handle in larger rolls, streamlining the installation process and reducing labor time and cost. Synthetic underlayment reduces the risk of wrinkles and overlaps by laying flat. It is also often attached with fewer fasteners because of the adhesive properties in some products.
Cost Implications	It is generally less expensive upfront, making it an attractive option for budget-conscious projects or where immediate cost savings are prioritized.	While more expensive than felt, synthetics can lower costs long-term because of their durability, fewer maintenance needs, and reduced labor costs during installation.
Environmental Impact	Contains organic materials mixed with petroleum-based asphalt. It’s considered less environmentally friendly and harder to recycle.	These are a more eco-friendly option than felt. Some recyclable synthetic underlayments reduce their environmental impact than felt.
Performance in Extreme Climates	Performs adequately in milder climates but may not hold out against extreme conditions over extended periods. Prolonged high heat exposure can accelerate its degradation.	Designed for a wider range of environmental conditions, synthetic underlayments perform exceptionally well in hot and cold climates. They provide added protection against ice damming and winds, making them suitable for areas around Phoenix with extreme weather fluctuations.

How Many Layers of Roof Underlayment Do I Need?

The number of underlayment layers can significantly affect a roof’s performance, particularly in a specific climate. The decision on how many layers of underlayment materials are needed will depend on factors such as building codes, roof design, the type of roofing material, and local weather considerations.

Factors Influencing the Number of Underlayment Layers

• Building Codes and Requirements. Local building codes often dictate the minimum requirements for roofing underlayment layers. For Phoenix, like many areas, one layer of underlayment is sufficient to meet these regulations for most standard roofing materials and pitches.
• Roof Slope and Design. The roof pitch determines the number of underlayment layers. In steeper roof pitches, water is naturally shed more efficiently, requiring only a single layer of underlayment. However, low-sloped roofs will need additional layers to enhance waterproofing capabilities since their water drainage is slower.
• Roofing Material. Certain roofing materials have different underlayment requirements. For instance, a single layer of high-quality synthetic or rubberized asphalt underlayment might suffice under metal roofs.
• Climate Considerations. Phoenix’s weather requires underlayments that can handle high heat and occasional heavy rainfall. While a single layer is adequate with modern high-performance materials, extra layers might be needed for low slope or complex roof designs to bolster weatherproofing.

Common Roofing Underlayment Practices in Phoenix, Arizona

Single Layer Underlayment

Most residential homes in Phoenix follow the standard practice of installing a single layer of underlayment, especially with high-quality synthetic or rubberized materials that can withstand intense sun and heat. This approach meets local building codes while providing efficient moisture protection during the occasional rains.

Multiple Layers

While not commonly needed, using multiple layers may be considered for specific scenarios such as:

• Flat or Low-Slope Roofs. Extra layers can offer increased protection against water pooling and slow drainage.
• Additional Insulation Needs. Some homeowners can add extra layers of insulation to increase its effects. However, this is less common given other more efficient insulation methods.
• Historical or Custom Architectural Homes. Unique architectural designs or historical homes may require adapted solutions.

Need Expert Roofing Solutions in Phoenix, Arizona? Talk to Stonecreek Roofing Today!

If you need expert consultation about roofing underlayments in Phoenix, Arizona, Stonecreek Roofing is available. Consider hiring our expertise if you need to talk to a GAF-certified roofer. Apart from consultations, we offer various roofing replacements, repairs, maintenance, and more. You can also turn to us whenever you need assistance with your roof insurance claim so that you can avail of our services.

Contact our company today if you have roofing-related questions, and our experts will gladly answer them.