What Is Roof Underlayment and Why Does It Matter?

Think of underlayment as the layer of chainmail underneath a knight’s armor. In combination with your roofing material of choice, it protects the structure of your roof. It helps to prevent leaks and other damage by creating a protective layer with many important properties. In the context of protecting your roof, underlayment is incredibly important.

What Is Roof Underlayment?

As stated, roof underlayment is the protective layer between the roof deck and the outer material. It’s an important second defense against water, wind, and UV damage. Roof underlayment comes in a few different variants: asphalt-saturated, synthetic, and rubberized.

• Asphalt-saturated felt: A traditional, affordable underlayment.
• Synthetic underlayment: Top choice for modern projects, lightweight and protective polymer.
• Self-adhering/rubberized membranes: Highly waterproof, making it ideal for leak-prone areas.

Why Roof Underlayment Matters

Roof underlayment is incredibly important. Without it, your roof wouldn’t stand a chance.

• Leak Protection:
  • Prevents water infiltration if shingles are damaged or lifted.
• Extends Roof Lifespan:
  • Protects the roof deck from moisture and heat, reducing wear.
• Improves Energy Efficiency:
  • Some underlayments reflect heat, reducing attic temperatures and energy bills.
• Enhances Roof Stability:
  • Provides a smooth surface for shingle installation and improves wind resistance.

Signs Your Roof Needs New Underlayment

It’s not uncommon for roof damage to include underlayment, especially after heavy damage from a storm. Here are some symptoms you can expect to see in the event your underlayment needs replaced:

• Visible Damage:
  • Tears, wrinkles, or exposed underlayment during roof inspections.
  • Example: Peeling underlayment visible under lifted shingles.
• Leaks or Water Damage:
  • Water stains in the attic or ceiling despite intact shingles.
• Age of Roof:
  • Underlayment typically lasts 15-30 years; older roofs may need replacement.
• Poor Installation Signs:
  • Bubbling shingles or uneven roof surfaces indicating improper underlayment.

Conclusion

Roof underlayment is a vital barrier that prevents leaks, extends roof life, enhances efficiency, yet it’s often overlooked. Quality underlayment is crucial to the long-term life of your roof. Richter Roofing is Western New York’s top choice for roof inspections, repair, and replacement. Schedule today for a free quote!