Choosing the Right Underlayment for Your Roof
When it comes to roofing, most homeowners focus on shingles or metal panels, but the roof underlayment is just as necessary. This hidden layer plays a crucial role in protecting your home from water damage, improving insulation, and extending the lifespan of your roof. The proper underlayment depends on your climate, roofing material, and budget. In this guide, we’ll explore the different types of underlayment and how to select the best option for your roof.
What Is Roof Underlayment?
Roof underlayment is a protective barrier between the roof deck (usually plywood or OSB) and the outer roofing material. It serves as an extra defense against moisture, wind, and extreme temperatures. Even the best shingles can develop gaps or small leaks over time, and the underlayment ensures that water doesn’t seep into your home.
Types of Roof Underlayment
There are three main types of underlayment, each with its benefits and best-use scenarios:
1. Asphalt-Saturated Felt (Felt Paper) – Seldom Used Anymore
Pros:
- Affordable and widely available
- Provides decent water resistance
- Can be used with various roofing materials
Cons:
- Less durable than modern alternatives
- Can absorb moisture and wrinkle over time
- Heavier and more complicated to install than synthetic underlayment
Best for: Homeowners on a budget, roofs with good drainage, and moderate climates without extreme weather conditions.
2. Synthetic Underlayment
Pros:
- Lightweight and easy to install
- Stronger and more durable than felt
- Provides excellent water resistance
- UV-resistant and holds up well in extreme temperatures
Cons:
- Higher upfront cost compared to felt
- Some lower-quality brands may not be fully waterproof
Best for: Homes in areas with heavy rainfall, snow, or strong winds. It’s also an excellent choice for metal roofs and long-term durability.
3. Rubberized Asphalt (Peel-and-Stick) Underlayment
Pros:
- 100% waterproof and self-sealing around nails
- Excellent for preventing leaks, especially in valleys and eaves
- Ideal for high-moisture and extreme weather conditions
Cons:
- Most expensive type of underlayment
- Heavier and more challenging to install
Best for: High-risk areas prone to leaks, such as valleys, chimneys, skylights, and roofs in hurricane or heavy snow regions.
How to Choose the Right Underlayment for Your Roof
- Consider Your Climate:
- If you live in a wet or snowy region, synthetic or rubberized asphalt underlayment is the best waterproofing choice.
- In hot climates, a UV-resistant synthetic underlayment will provide better durability.
- Traditional felt underlayment may be sufficient if you live in an area with mild weather.
- Match It to Your Roofing Material:
- Asphalt shingles work well with all types of underlayment.
- Metal roofs pair best with synthetic or rubberized asphalt to prevent condensation buildup.
- Tile and slate roofs require a durable synthetic underlayment to handle their weight.
- Think About Longevity:
- If you plan to stay in your home long-term, investing in higher-quality synthetic or rubberized underlayment can save you money on future repairs.
Conclusion
Proper roof underlayment protects your home from moisture, leaks, and weather damage. While asphalt felt is budget-friendly, synthetic underlayment offers better durability, and rubberized asphalt provides superior waterproofing. When making a decision, consider your climate, roofing material, and budget.
Consult a professional contractor if you’re unsure which underlayment is best for your roof. Investing in the proper underlayment now can help extend the lifespan of your roof and protect your home for years to come.
