When it comes to protecting your roof, underlayment plays a critical role. It’s the hidden layer beneath your shingles or tiles that acts as a barrier against water, wind, and weather damage. Choosing between synthetic underlayment and traditional felt paper can make a big difference in the durability and performance of your roof. With the guidance of a trusted roofing company, homeowners can make the right choice based on climate, budget, and roofing materials.

What Is Roof Underlayment?

Roof underlayment is a protective sheet installed between the roof deck (the plywood or wood sheathing) and the roofing material (like shingles). It serves as a secondary defense layer against leaks in case the outer roofing material gets damaged or water seeps through. There are two main types of underlayment used in modern roofing traditional felt paper and synthetic underlayment. Both serve the same purpose but differ in material, durability, and installation process.

Traditional Felt Paper

Traditional felt paper, also called tar paper or asphalt-saturated felt, has been used for decades in roofing systems. It’s made by soaking a paper or fiberglass mat with asphalt to make it water-resistant. Felt underlayment typically comes in two thicknesses: 15-pound and 30-pound, with the thicker version offering better protection.

Advantages of Felt Paper:

1. Proven Performance: Felt has been used for many years and has a long history of reliable performance.
2. Lower Cost: It’s generally more affordable than synthetic underlayment, making it attractive for budget-conscious projects.
3. Good for Smaller Jobs: Ideal for short-term or small-scale roofing projects.

Disadvantages of Felt Paper:

1. Less Durable: Felt can tear easily during installation, especially in windy conditions.
2. Water Absorption: It can absorb moisture, which may lead to wrinkles or damage if exposed to rain before shingle installation.

Synthetic Underlayment

Synthetic underlayment is a modern alternative made from woven or spun polyethylene or polypropylene. It’s designed to be lighter, stronger, and more resistant to the elements than traditional felt.

Advantages of Synthetic Underlayment:

1. Superior Strength: Synthetic materials are highly tear-resistant and can withstand foot traffic during installation.
2. Waterproof and UV Resistant: Unlike felt, synthetic underlayment repels water completely and can be left exposed for weeks without damage.
3. Lightweight and Easy to Install: Rolls of synthetic underlayment cover more area and are easier to handle on the roof.
4. Longer Lifespan: It maintains its shape and performance over time, even in extreme weather.

Disadvantages of Synthetic Underlayment:

1. Higher Cost: It’s more expensive upfront than felt, though it often pays off with longevity and performance.
2. Not Always Necessary for Every Roof: Some smaller or low-budget projects may not require premium materials.

Conclusion

If you’re planning a new roof or replacement, contact a trusted roofing company at Astoria Roofing, 29-16 30th Ave Astoria, NY 11102, (718)-285-6273 https://www.astoriaroofingny.com today to discuss the best underlayment option for your home and get expert installation you can count on!