When it comes to roofing, the underlayment is key. Let's compare the roofing synthetic underlayment with the traditional felt one,

to help you make the right choice.

Waterproofing: Synthetic Wins

Traditional felt underlayment uses asphalt and fibers. Over time, asphalt ages and cracks, leading to poor waterproofing and roof leaks

during heavy rain. In contrast, synthetic underlayment made of advanced polymers like TPO or PVC has a low permeability and offers

long - lasting waterproof protection.

Weather Resistance: Synthetic Shines

Traditional felt underlayment ages fast under UV, high and low temperatures. In summer, asphalt softens; in winter, felt gets brittle,

shortening its lifespan and raising maintenance costs. Synthetic underlayment, however, has strong weather resistance, resists UV well,

and can function steadily in extreme weather, with a lifespan 5 - 10 years longer.

Strength: Synthetic is Stronger

During construction or under external forces, traditional felt underlayment, with low tensile strength, tears easily when wet. Synthetic

underlayment, on the other hand, has high strength and great tear resistance, remaining intact during installation and in bad weather.

Breathability: Synthetic's Edge

Traditional felt underlayment has poor breathability, causing water vapor to build up inside the roof and damage materials. Some

synthetic underlayments are designed to be breathable while waterproof, keeping the roof dry.